Publications

Highlights

(For a full list see below or go to Google Scholar)

Excited State Dynamics of cis,cis-1,3-Cyclooctadiene: Non-adiabatic Trajectory Surface Hopping

We have performed trajectory surface hopping dynamics for cis,cis-1,3-cyclooctadiene to investigate the photochemical pathways involved after being excited to the S1 state. Our calculations reveal ultrafast decay to the ground state, facilitated by conical intersections involving distortions around the double bonds. The main distortions are localized on one double bond, involving twisting and pyramidalization of one of the carbons of that double bond (similar to ethylene), while a limited number of trajectories decay via delocalized (non-local) twisting of both double bonds. The interplay between local and non-local distortions is important in our understanding of photoisomerization in conjugated systems. The calculations show that a broad range of the conical intersection seam space is accessed during the non-adiabatic events. Several products formed on the ground state have also been observed.

Pratip Chakraborty, Yusong Liu, Thomas Weinacht, and Spiridoula Matsika

J. Chem. Phys., 152, 174302 (2020)

Role of charge transfer states into the formation of cyclobutane pyrimidine dimers in DNA

Photoinduced charge transfer between neighboring bases plays an important role in DNA. One of its important effects is shown in its ability to affect the photochemical yields of the formation of cyclobutane pyrimidine dimer (CPD) products between adjacent pyrimidine bases. In this work we examine how the energies of charge transfer states depend on the sequences of oligonucleotides using a hybrid quantum and molecular mechanics (QM/MM) methodology combined with the algebraic diagrammatic construction through a second order electronic structure method for excited states.

Wook Lee and Spiridoula Matsika

Faraday Discussions, 216, 507-519 (2018)

Electronic Resonances of Nucleobases Using Stabilization Methods

The interaction of low-energy electrons with nucleobases is important because of their potential to damage nucleic acids. In this work we investigate several low-lying resonances of nucleobases using quantum chemical methods including static and dynamical correlation coupled with orbital stabilization methods.

Mark A. Fennimore, and Spiridoula Matsika

J. Phys. Chem. A, 122, 4048-4057, (2018)

 

Full List

Excited State Dynamics of cis,cis-1,3-Cyclooctadiene: UV Pump VUV Probe Time Resolved Photoelectron Spectroscopy
Yusong Liu, Pratip Chakraborty, Spiridoula Matsika and Thomas Weinacht
J. Chem. Phys., submitted (2019)

Excited State Dynamics of cis,cis-1,3-Cyclooctadiene: Non-adiabatic Trajectory Surface Hopping
Pratip Chakraborty, Yusong Liu, Thomas Weinacht, and Spiridoula Matsika
J. Chem. Phys., 152, 174302 (2020)

The Generality of the GUGA MRCI Approach in COLUMBUS for Treating Complex Quantum Chemistry
Hans Lischka, Ron Shepard, Thomas Muller, Peter G. Szalay, Russel M. Pitzer, Adelia J. A. Aquino, Mayzza M. Araujo do Nascimento, Mario Barbatti, Lachlan T. Belcher, Itamar Borges Jr., Scott R. Brozell, Anita Das, Silmar A. do Monte, Leticia Gonzalez, William L. Hase, Gary Kedziora, Fabris Kossoski, Francisco B. C. Machado, Spiridoula Matsika, Dana Nachtigallova, Reed Nieman, Markus Oppel, Felix Plasser, Rene F. K. Spada, Eric A. Stahlberg, Elizete Ventura, David R. Yarkony
J. Chem. Phys., 152, 134110 (2020)

Comparative study of methodologies for calculating metastable states of small to medium-sized molecules
Mushir Thodika, Mark Fennimore, Tolga N.V. Karsili and Spiridoula Matsika
J. Chem. Phys., 151, 244104 (2019)

Electron correlation in channel resolved strong field molecular double ionization
Chuan Cheng, Patricia Vindel Zandbergen, Spiridoula Matsika, and Thomas Weinacht
Phys. Rev. A, 100, 053405 (2019)

Theoretical Investigation of Positional Substitution and Solvent Effects on n-Cyanoindole Fluorescent Probes
Salsabil Abou-Hatab and Spiridoula Mastika
J. Phys. Chem. B, 123, 7424 - 7435 (2019)

Role of charge transfer states into the formation of cyclobutane pyrimidine dimers in DNA
Wook Lee and Spiridoula Matsika
Faraday Discussions, 216, 507-519 (2018)

Intersystem crossing in the exit channel
Hongwei Li, Alexander Kamasah, Spiridoula Matsika, Arthur G. Suits
Nature Chem 11, 123–128 (2019)

Strong and Weak-Field Ionization in Pump-Probe Spectroscopy
Spencer L. Horton, Yusong Liu, Pratip Chakraborty, Philipp Marquetand, Tamas Rozgonyi, Spiridoula Matsika and Thomas Weinacht
Phys. Rev. A, 98, 053416, (2018)

Ultrafast Photoinduced Processes in Polyatomic Molecules: Electronic Structure, Dynamics and Spectroscopy dedicated to Prof. Wolfgang Domcke on the occasion of his 70th birthday
Maxim F. Gelin, Spiridoula Matsika, Andrzej Sobolewski and Yoshitaka Tanimura
Chem. Phys., 515, 1-2, (2018)

Introduction: Theoretical Modeling of Excited State Processes
Spiridoula Matsika and Anna Krylov
Chem. Rev. , 118, 6925-6926, (2018)

The Origin of Fluorescence in DNA Thio-Analogues
Tolga N. V. Karsili, Mushir Thodika, Linh Nguyen, Spiridoula Matsika
Chem. Phys. 515, 434-440 (2018)

Electron-induced origins of prebiotic sugars: self-reactions of methanol anion clusters
Tolga N.V. Karsili, Mark A. Fennimore and Spiridoula Matsika
Phys. Chem. Chem. Phys., 20, 12599 - 12607, (2018)

Electronic Resonances of Nucleobases Using Stabilization Methods
Mark A. Fennimore, and Spiridoula Matsika
J. Phys. Chem. A, 122, 4048-4057, (2018)

Quadruple coincidence measurement of electron correlation in strong field molecular double ionization
Arthur Zhao, Chuan Cheng, Spiridoula Matsika and Thomas Weinacht
Phys. Rev. A, 97, 043412, (2018)

Photochemical Formation of Cyclobutane Pyrimidine Dimers in DNA through Electron Transfer from a Flanking Base
Wook Lee and Spiridoula Matsika
Chem. Phys. Chem. 19, 1568-1571 (2018)

Mechanistic insights into photoinduced damage of DNA and RNA nucleobases in the gas phase and in bulk solution
Pratip Chakraborty, Tolga N.V. Karsili, Barbara Marchetti, and Spiridoula Matsika
Faraday Discussions, 207, 329 - 350, (2018)

Origins of Photodamage in Pheomelanin Constituents: Photochemistry of 4-Hydroxybenzothiazole
Tolga N.V. Karsili, Barbara Marchetti, and Spiridoula Matsika
J. Phys. Chem. A, 122, 1986-1993 (2018)

Calculations of non-adiabatic couplings within equation-of-motion coupled-cluster framework: Theory, implementation, and validation against multi-reference methods
Shirin Faraji, Spiridoula Matsika, and Anna I. Krylov
Chem. Phys, 148 , 044103, (2018)

Vibrationally Assisted Below Threshold Ionization
Spencer L. Horton, Yusong Liu, Pratip Chakraborty, Spiridoula Matsika, and Thomas Weinacht
Phys. Rev. A, 95, 063413, (2017)

Mechanisms of H and CO Loss from the Uracil Anion Following Low Energy Electron Irradiation
Mark A. Fennimore, Tolga N. V. Karsili and Spiridoula Matsika
Phys.Chem.Chem.Phys., 19, 17233 - 17241, (2017)

Controlling Photorelaxation in Uracil with Shaped Laser Pulses: A Theoretical Assessment
Daniel Keefer, Sebastian Thallmair, Spiridoula Matsika and Regina de Vivie-Riedle
J.Am. Chem. Soc., 139, 5061 - 5066, (2017)

Ultrafast Internal Conversion Dynamics of Highly Excited Pyrrole Studied with VUV/UV Pump Probe Spectroscopy
Spencer L. Horton, Yusong Liu, Pratip Chakraborty, Spiridoula Matsika, and Thomas Weinacht
J. Chem. Phys., 146, 064306, (2017)

Substituent Effects on the Absorption and Fluorescence Properties of Anthracene
Salsabil Abou-Hatab, Vincent A. Spata, Spiridoula Matsika
J. Phys. Chem. A, 121, 1213-1222, (2017)

Conformational and electronic effects on the formation of anti cyclobutane pyrimidine dimer in G-quadruplex structure
Wook Lee and Spiridoula Matsika
Phys. Chem. Chem. Phys. , 19, 3325-3336, (2017)

Core-Excited and Shape Resonance of Uracil
Mark A. Fennimore and Spiridoula Matsika
Phys.Chem.Chem.Phys., 18, 30536 - 30545, (2016)

Coexistence of different electron transfer mechanisms in the DNA repair process by photolyase
Wook Lee, Goutham Kodali, Robert J. Stanley, Spiridoula Matsika
Chemistry-A European Journal, 22, 11371-11381, (2016)

Photophysical Properties of Pyrrolocytosine, a Cytosine Fluorescent Base Analogue
Quynh Nguyen, Vincent A. Spata, Spiridoula Matsika
Phys.Chem.Chem.Phys., 18, 20189-20198, (2016)

Molecular Double Ionization Using Field Few Cycle Laser Pulses
Arthur Zhao, Peter Sandor, Vincent Tagliamonti, Thomas Weinacht, and Spiridoula Matsika
J. Phys. Chem. A , 120, 3233–3240, (2016)

Excimers and Exciplexes in Photoinitiated Processes of Oligonucleotides
Vincent A. Spata, Wook Lee and Spiridoula Matsika
J. Phys. Chem. Lett., invited perspective, 7, 976-984, (2016)

Surface hopping investigation of the relaxation dynamics in radical cations
Mariana Assmann, Thomas Weinacht, and Spiridoula Matsika
J. Chem. Phys., 144, 034301 (2016)

Photophysical Deactivation Pathways in Adenine Oligonucleotides
Vincent A. Spata and Spiridoula Matsika
Phys.Chem.Chem.Phys., 17, 31073 (2015)

Controlling the Dissociation Dynamics of Acetophenone Radical Cation Through Excitation of Ground and Excited State Wavepackets
Katherine Moore Tibbetts, Maryam Tarazkar, Timothy Bohinski, Dmitri Romanov, Spiridoula Matsika and Robert Levis
Journal of Physics B Atomic, Molecular and Optical Physics, 48, 164002, (2015)

Excited state relaxation of neutral and basic 8-Oxoguanine
Zhen Lu, Ashley Beckstead, Bern Kohler, Spiridoula Matsika
J. Phys. Chem. B, 119, 8293 - 8301, (2015)

QM/MM studies reveal pathways leading to the quenching of the formation of thymine dimer photoproduct by flanking bases
Wook Lee and Spiridoula Matsika
Phys. Chem. Chem. Phys. 17, 9927-9935, (2015)

Photoelectron spectrum and dynamics of the uracil cation
Mariana Assmann, Horst Köppel and Spiridoula Matsika
J. Phys. Chem. A, 119, 866-875, (2015)

Modified Nucleobases
S. Matsika
Topics in Current Chemistry - Photoinduced Phenomena in Nucleic Acids 355, 209-243, (2015)

Strong Field Adiabatic Ionization Prepares a Launch State for Coherent Control
Timothy Bohinski, Katharine Moore Tibbetts, Maryam Tarazkar, Dmitri Romanov, Spiridoula Matsika and Robert Levis
J. Phys. Chem. Lett., 5, 4305-4309, (2014)

Tribute to David R. Yarkony
Spiridoula Matsika, Henry F. Schaefer, III, and Michael S. Schuurman
J. Phys. Chem. A, 118, 11837-11837, (2014)

What We Can Learn from the Norms of One-particle Density Matrices, and What We Can’t
Spiridoula Matsika, Xintian Feng, Anatoly Luzanov, Anna Krylov
J. Phys. Chem. A, 118, 11943-11955, (2014)

Role of Excitonic Coupling and Charge-Transfer States in the Absorption and CD Spectra of Adenine-Based Oligonucleotides Investigated through QM/MM Simulations
Vincent Spata and Spiridoula Matsika
J. Phys. Chem. A, 118, 12021-12030, (2014)

Theoretical Studies of the Excited States of p-Cyanophenylalanine and Comparisons with the Natural Amino Acids Phenylalanine and Tyrosine
Stephen Meloni and Spiridoula Matsika
Theoretical Chemistry Accounts, 133, 1497, (2014)

Radical Cation Spectroscopy of Substituted Alkyl Phenyl Ketones via Tunnel Ionization
Timothy Bohinski, Katharine Moore Tibbetts, Kristin Munkerup, Maryam Tarazkar, Dmitri Romanov, Spiridoula Matsika and Robert Levis
Chemical Physics, 442, 81-85, (2014)

Ultrafast Excited-State Dynamics and Vibrational Cooling of 8-oxo-7,8-dihydro-2-deoxyguanosine in D2O
Yuyuan Zhang, Jordan Dood, Ashley Beckstead, Jinquan Chen, Xi-Bo Li, Cynthia J. Burrows, Zhen Lu, Spiridoula Matsika, and Bern Kohler
J. Phys. Chem. A, 117, 48, 12851-12857, (2013)

Measurement of Ionic Resonances in Alkyl Phenyl Ketone Cations via Infrared Strong Field Mass Spectrometry
Timothy Bohinski, Katharine Moore Tibbetts, Maryam Tarazkar, Dmitri Romanov, Spiridoula Matsika, and Robert Levis
J. Phys. Chem. A, 117, 47, 12374-12381, (2013)

Ultrafast Relaxation Dynamics of Uracil Probed via Strong Field Dissociative Ionization
Spiridoula Matsika, Michael Spanner, Marija Kotur, and Thomas C. Weinacht
J. Phys. Chem. A, 117, 48, 12796-12801, (2013)

Excited-State Tautomerization of Gas-Phase Cytosine
Catherine G. Triandafillou and Spiridoula Matsika
J. Phys. Chem. A, 117, 46, 12165-12174,(2013)

Dissociative electron attachment to carbon dioxide via the 2Πu shape resonance
A. Moradmand, D. S. Slaughter, D. J. Haxton, T. N. Rescigno, C. W. McCurdy, Th. Weber, S. Matsika, A. L. Landers, A. Belkacem, and M. Fogle
Phys. Rev. A, 88, 032703, (2013)

Measurement of an Electronic Resonance in Ground State, Gas Phase Acetophenone Cation via Strong Field Mass Spectrometry
Timothy Bohinski, Katharine Moore Tibbetts, Maryam Tarazkar, Dmitri Romanov, Spiridoula Matsika, Robert J. Levis
J. Phys. Chem. Lett., 4, 10, 1587-1591, (2013)

High-Multiplicity Natural Orbitals in Multireference Configuration Interaction for Excited State Potential Energy Surfaces
Zhen Lu and Spiridoula Matsika
J. Phys. Chem. A, 117, 32, 7421-7430, (2013)

Exciplexes and conical intersections lead to fluorescence quenching in pi-stacked dimers of 2-aminopurine with nucleobases
JingXin Liang, Quynh L. Nguyen, and Spiridoula Matsika
Photochem. Photobiol. Sci.,12, 1387-1400, (2013)

Contrasting Photophysical Behaviors of Star-shaped vs Linear Chromophores
Christopher M. Pochas, Kurt A. Kistler, Hajime Yamagata, Spiridoula Matsika, Frank C. Spano
J. Am. Chem. Soc., 135, 8, 3056-3066, (2013)

A Benchmark of Excitonic Couplings Derived from Atomic Transition Charges
Kurt A. Kistler, Francis C. Spano, and Spiridoula Matsika
J. Phys. Chem. B, 117, 7, 2032-2044, (2013)

Angle-Resolved Strong Field Ionization of Polyatomic Molecules: More than the Orbitals Matters
Oumarou Njoya, Spiridoula Matsika, and Thomas Weinacht
ChemPhysChem, 14, 1451-1455, (2013)

Ultrafast Excited State Dynamics of Allopurinol, a Modified DNA Base
Juan P. Villabona-Monsalve, Rosa E. Islas, William Rodriguez-Cordoba, Spiridoula Matsika and Jorge Peon
J. Phys. Chem. A, 117, 5, 898-904, (2013)

Neutral Ionic Correlations in Strong Field Molecular Ionization
Marija Kotur, Congyi Zhou, Spiridoula Matsika, Serguei Patchkovskii, Michael Spanner, and Thomas C. Weinacht
Phys. Rev. Lett., 109, 203007, (2012)

Dyson Norms in XUV and Strong-field Ionization of Polyatomics: Cytosine and uracil
Michael Spanner, Serguei Patchkovskii, Congyi Zhou, Spiridoula Matsika, Marija Kotur, and Thomas C. Weinacht
Phys. Rev. A, 86, 053406, (2012)

Fragmentation Pathways in the Uracil Radical Cation
Congyi Zhou, Spiridoula Matsika, Marija Kotur, and Thomas C. Weinacht
J. Phys. Chem. A, 116, 9217-9227, (2012)

Correction to Pathways for Fluorescence Quenching in 2-Aminopurine pi-Stacked with Pyrimidine Nucleobases
JingXin Liang, and Spiridoula Matsika
J. Amer. Chem. Soc., 134, 10713 - 10714, (2012)

Two Dimensional Fourier-Transform Spectroscopy of Adenine and Uracil Using Shaped Ultrafast Laser Pulses in the Deep UV
Chien-hung Tseng, Peter Sandor, Marija Kotur, Thomas C. Weinacht and Spiridoula Matsika
J. Chem. Phys., 137, 22A537, (2012)

On the Accessibility to Conical Intersections in Purines: Hypoxanthine and its Singly Protonated and Deprotonated Forms
Juan Villabona-Monsalve, Raquel Noria, Spiridoula Matsika, and Jorge Peon
J. Am. Chem. Soc., 134, 7820 - 7829. (2012)

High-multiplicity natural orbitals in multireference configuration interaction for excited states
Zhen Lu, and Spiridoula Matsika
J. Chem. Theory Comput., 8, 509-517, (2012)

Absorption, Circular Dichroism and Photoluminescence in Perylene Diimide Bichromophores: Polarization Dependent H- and J-aggregate Behavior
K. A. Kistler, C. M. Pochas, H. Yamagata, S. Matsika and F.C. Spano
J. Phys. Chem. B, 116, 77 - 86, (2012)

Nuclear Dynamics on a Three-state Jahn-Teller Model System
Pascal Krause and Spiridoula Matsika
J. Chem. Phys., 136, 034110 (2012)

Following Ultrafast Radiationless Relaxation Dynamics With Strong Field Dissociative Ionization: A Comparison Between Adenine, Uracil, and Cytosine
Marija Kotur, Thomas C. Weinacht, Congyi Zhou, and Spiridoula Matsika
IEEE Journal of selected topics in Quantum Electronics, 18, 187-194, (2012)

Three-state conical intersections
Spiridoula Matsika
Chapter in Conical Intersections: Theory, Computation and Experiment, Advanced Series in Physical Chemistry - Vol 17, 83-116, World Scientific Publishing Company, 2011

Strong Field Molecular Ionization from Multiple Orbitals
Marija Kotur, Thomas C. Weinacht, Congyi Zhou, and Spiridoula Matsika
Phys. Rev. X, 1, 021010, (2011)

Combining dissociative ionization pump probe spectroscopy and ab initio calculations to explore excited state dynamics involving conical intersections
Spiridoula Matsika, Congyi Zhou, Marija Kotur, and Thomas C. Weinacht
Faraday Discussions, 153, 247 - 260, (2011)

Distinguishing Between Relaxation Pathways by Combining Dissociative Ionization Pump Probe Spectroscopy and ab initio Calculations: A Case Study of Cytosine
Marija Kotur, Thomas C. Weinacht, Congyi Zhou, Kurt A. Kistler, and Spiridoula Matsika
J. Chem. Phys., 134, 184309, (2011)

Pathways for fluorescence quenching in 2-aminopurine pi-stacked with pyrimidine nucleobases
JingXin Liang, and Spiridoula Matsika
J. Amer. Chem. Soc., 133 , 6799-6808, (2011)

Nonadiabatic Events and Conical Intersections
Spiridoula Matsika, and Pascal Krause
Annu. Rev. Phys. Chem., 62, 621 - 643, (2011)

Photophysical pathways of cytosine in aqueous solution
Kurt A. Kistler and Spiridoula Matsika
Phys. Chem. Chem. Phys., 12, 5024-5031, (2010)

Excited State Energies and Electronic Couplings of DNA Base Dimers
Christopher R. Kozak, Kurt A. Kistler, Zhen Lu, and Spiridoula Matsika
J. Phys. Chem. B, 114, 4, 1674-1683, (2010)

Change in Electronic Structure upon Optical Excitation of 8-Vinyladenosine: An Experimental and Theoretical Study
Goutham Kodali, Kurt A. Kistler, Madhavan Narayanan, Spiridoula Matsika, and Robert J. Stanley
J. Phys. Chem. A, 114, 1, 256-267, (2010)

An Ab Initio Study of Substituent Effects on the Excited States of Purine Derivatives
Elizabeth Mburu and Spiridoula Matsika
J. Phys. Chem. A, 112, 48, 12485-12491,(2008)

On the Electronically Excited States of Uracil
Evgeny Epifanovsky, Karol Kowalski, Peng-Dong Fan, Marat Valiev, Spiridoula Matsika, and Anna I. Krylov
J. Phys. Chem. A, 112, 40, 9983-9992, (2008)

Three-State Conical Intersections in Cytosine and Pyrimidinone Bases
Kurt A. Kistler and Spiridoula Matsika
J. Chem. Phys. 128, 215102 (2008)

Interpreting Ultrafast Molecular Fragmentation Dynamics with ab initio Calculations
Carlos Trallero, Brett J. Pearson, Thomas Weinacht, Kandis Gilliard, and Spiridoula Matsika
J. Chem. Phys. 128, 124107 (2008)

Two and three state conical intersections in uracil cation radical
Spiridoula Matsika
Chem. Phys., 349, 356-362, (2008)

2-Aminopurine Excited State Electronic Structure Measure by Stark Spectroscopy
Goutham Kodali, Kurt A. Kistler, Spiridoula Matsika, and Robert J. Stanley
J. Phys. Chem. B, 112, 6, 1789-1795, (2008)

Excited Electronic States and Photophysics of Uracil-Water Complexes
Akihiko Yoshikawa and Spiridoula Matsika
Chem. Phys., 347, 393-404, (2008)

Inclusion of Second-order Correlation Effects for the Ground and Singly Excited States Suitable for the Study of Conical Intersections: the CIS(2) Model
Dimitri Laikov and Spiridoula Matsika
Chem. Phys. Lett., 448, 132-137, (2007)

Cytosine in Context: A Theoretical Study of Substituent Effects on the Excitation Energies of 2-Pyrimidinone Derivatives
Kurt A. Kistler and Spiridoula Matsika
J. Phys. Chem. A, 111, 35, 8708-8716, (2017)

6MAP, a fluorescent adenine analogue, is a probe of base flipping by DNA photolyase
Kongsheng Yang, Spiridoula Matsika, and Robert J. Stanley
J. Phys. Chem. B, 111, 35, 10615-10625, (2017)

Radiationless Decay Mechanism of Cytosine: An Ab Initio Study with Comparisons to the Fluorescent Analogue 5-Methyl-2-Pyrimidinone
Kurt A. Kistler and Spiridoula Matsika
J. Phys. Chem. A, 111, 14, 2650-2661, (2007)

The Fluorescence Mechanism of 5-Methyl-2-Pyrimidinone: An Ab Initio Study of a Fluorescent Pyrimidine Analog
Kurt A. Kistler and Spiridoula Matsika
Photochemistry and Photobiology , 83, 611-624, (2007)

Conical intersections in Molecular Systems
Spiridoula Matsika
Rev. Comp. Chem. 23 , 83, (2007)

A Combined Multireference Configuration Interaction/Molecular Dynamics Approach for Calculating Solvatochromic Shifts- Application to the nO -> pi* Electronic Transition in Formaldehyde
ZongRong Xu and Spiridoula Matsika
J. Phys. Chem. A, 110, 43, 12035-12043, (2006)

Excited Electronic States of the Cyclic Isomers of O3 and SO2
Ruth Elliott, Ryan Compton, Robert Levis, and Spiridoula Matsika
J. Phys. Chem. A, 109, 49, 11304 - 11311, (2005)

Three-state Conical Intersections in Nucleic Acid Bases
Spiridoula Matsika
J. Phys. Chem. A., 109, 33, 7538-7545, (2005)

Radiationless Decay of Excited States of Uracil through Conical Intersections
Spiridoula Matsika
J. Phys. Chem. A 2004, 108, 37, 7584-7590, (2004)

Quantitative Detection of Singlet O2 via Cavity Enhanced Absorption
Skip Williams, Manish Gupta, Thomas Owano, Douglas S. Baer, Anthony O’Keefe, David R. Yarkony, and Spiridoula Matsika
Opt. Lett. 29, 1066-1068, (2004)

Conical Intersections of Three Electronic States Affect the Ground State of Radical Species with Little or No Symmetry: Pyrazolyl
Spiridoula Matsika and David R. Yarkony
J. Am. Chem. Soc. 2003, 125, 41, 12428-12429, (2003)

Beyond Two-State Conical Intersections. Three-State Conical Intersections in Low Symmetry Molecules: the Allyl Radical
Spiridoula Matsika and David R. Yarkony
J. Am. Chem. Soc. 2003, 125, 35, 10672-10676, (2003)

Photodissociation of the Vinoxy Radical through Conical, and Avoided, Intersections
Spiridoula Matsika and David R. Yarkony
J. Chem. Phys. 117, 7198, (2002)

Accidental Conical Intersections of Three States of the Same Symmetry. I. Location and Relevance
Spiridoula Matsika and David R. Yarkony
J. Chem. Phys. 117, 6907, (2002)

Spin-Orbit Coupling and Conical Intersections . IV. A Perturbative Determination of the Electronic Energies, Derivative Couplings and a Rigorous Diabatic Representation near a Conical Intersection. The General Case
Spiridoula Matsika and David R. Yarkony
J. Phys. Chem. B 2002, 106, 33, 8108-8116, (2002)

Conical Intersections and the Nonadiabatic Reactions H2O+O(3P) -> OH(A)+OH(X)
Spiridoula Matsika and David R. Yarkony
J. Chem. Phys. 117, 3733, (2002)

Conical Intersections and the Spin-Orbit Interaction
Spiridoula Matsika and David R. Yarkony
The Role of Degenerate States in Chemistry: A Special Volume of Advances in Chemical Physics, 124, 557-581, (2002)

Intersecting Conical Intersection Seams: their Location, Representation, and Effect on Local Topography
Spiridoula Matsika and David R. Yarkony
J. Phys. Chem. A 2002, 106, 11, 2580-2591, (2002)

Spin-Orbit Coupling and Conical Intersections in Molecules with an Odd Number of Electrons. III. A Perturbative Determination of the Electronic Energies, Derivative Couplings and a Rigorous Diabatic Representation near a Conical Intersection
Spiridoula Matsika and David R. Yarkony
J. Chem. Phys. 116, 2825, (2002)

On the Effects of Spin-Orbit Coupling on Conical Intersection Seams in Molecules with an Odd Number of Electrons. II. Characterizing the Local Topography of the Seam
Spiridoula Matsika and David R. Yarkony
J. Chem. Phys. 115, 5066, (2001)

On the Effects of Spin-Orbit Coupling on Conical Intersection Seams in Molecules with an Odd Number of Electrons. I. Locating the Seam
Spiridoula Matsika and David R. Yarkony
J. Chem. Phys. 115, 2038, (2001)

Electronic Structure and Spectra of Actinyl Ions
S. Matsika, Z. Zhang, S. R. Brozell, J.-P. Blaudeau, Q. Wang, R. M. Pitzer
J. Phys. Chem. A 2001, 105, 15, 3825-3828, (2001)

Actinyl Ions in Cs2UO2Cl4
S. Matsika and R. M. Pitzer
J. Phys. Chem. A 2001, 105, 3, 637-645, (2001)

Intensities in the Spectra of Actinyl Ions
S. Matsika, R. M. Pitzer
J. Phys. Chem. A 2000, 104, 51, 11983-11992, (2000)

The Electronic Spectrum of the NpO22+ and NpO2+ Ions
S. Matsika and R. M. Pitzer
J. Phys. Chem. A 2000, 104, 17, 4064-4068, (2000)

Atomic Orbital Basis Sets for Use with Effective Core Potentials
J.-P. Blaudeau, S. R. Brozell, S. Matsika, Z. Zhang and R. M. Pitzer
Int. J. Quantum Chem., 77, 516-520, (2000)

Spin-Orbit Splittings in Mg+-Neutral Complexes
S. Matsika and R. M. Pitzer
J. Phys. Chem. A 1998, 102, 9, 1652-1656, (1998)

Ab Initio Study of the Ground and Several Excited States of the NLi System
S. Matsika, A. Papakondylis and A. Mavridis
Chem. Phys. Lett., 250, 409-414, (1996)