B.S. ('94), National and Kapodistrian University of Athens, Greece
RESEARCH GROUP http://astro.temple.edu/~smatsika/
Computational / Photonics / Physical
Most chemical processes follow the Born-Oppenheimer (adiabatic) approximation, in which the nuclei move on a single electronic potential energy surface (PES). However there are important processes where this approximation breaks down. These nonadiabatic events play an important role in essential processes in nature such as photosynthesis, vision, charge transfer and photochemistry. Nonadiabatic processes are facilitated by the close proximity of two PESs and the efficiency increases in the extreme case when two PESs become degenerate forming conical intersections. Theoretical developments have enabled the efficient study of conical intersections in small systems. The focus of our group is to extend these studies to more complicated systems, particularly of biological interest, in an effort to understand the underlying mechanisms of photoinitiated nonadiabatic processes and their potential implications.
Nonadiabatic processes are closely related to the processes involved in laser control of chemical reactions. In collaboration with experimentalists we aim at understanding the underlying mechanisms involved in laser control of basic chemical reactions, such as fragmentation and isomerization. Theory is used to interpret and guide the control.
Projects that we are working on involve:
S. Matiska, M. Spanner, "Ultrafast Relaxation Dynamics of Uracil Probed via Strong Field Dissociative Ionization." Journal of Physical Chemistry A. 117(48), 12796-12801, (2013).
Y, Zhang, j. Dood, A. Beckstead, S. Matiska, "Ultrafast Excited-State Dynamics and Vibrational Cooling of 8-Oxo-7, 8-dihydro-2' -deoxyguanosine in D2O." Journal of Physical Chemistry A. 117(48), 12851-12857, (2013).
T. Bohinski, KT. Moore, M. Tarazkar, S. Matiska, "Measurement of Ionic Resonance in Alkyl Phenyl Ketone Cations via Infrared Strong Field Mass Spectrometry." Journal of Physical Chemistry A, 117(47), 12374-12381, (2013).
CG. Triandafillou, S. Matiska, "Excited-State Tautomerization of Gas-Phase Cytosine." Journal of Physical Chemistry A. 117(46), 12165-12174, (2013).
VA. Spata, S. Matsika, "Bonded excimer formation in pi-stacked 9-methyladenine dimers." The Journal of Physical Chemistry A. 117(36), 8718-28, (2013).
Z. Lu, S. Matiska, "High- Multiplicity Natural Orbitals in Multireference Configuration Interaction for Excited State Potential Energy Surfaces." Journal of Physical Chemsitry A. 117(32), 7421-7430, (2013).
M. Kotur, CY. Zhou, S. Matsika, S. Patchkovskii, M. Spanner, TC. Weinacht, "Neutral-Ionic State Correlations in Strong-Field Molecular Ionization." Physical Review letters. 109(20), 203007, (2012).
CY. Zhou, S. Matsika, M. Kotur, TC. Weinacht, "Fragmentation Pathways in the Uracil Radical Cation." Journal of Physical Chemistry A. 116(37), 9217-9227, (2012).
JP. Villabona-Monsalve, R. Noria, S. Matsika, J. Peon, "On the Accessibility to Conical Intersections in Purines: Hypoxanthine and its Singly Protonated and Deprotonated Forms." Journal of the American Chemical Society. 134(18), 7820-7829, (2012).
CH. Tseng, P. Sandor, M. Kotur, TC. Weinacht, S. Matsika, "Two-Dimensional Fourier Transform Spectroscopy of Adenine and Uracil Using Shaped Ultrafast Laser Pulses in the Deep UV." Journal of Physical Chemistry A. 116(11), 2654-2661, (2012).
P. Krause, S. Matsika, "Nuclear dynamics for a three-state Jahn-Teller model system." Journal of Chemical Physics. 136(3), 034110, (2012).
M. Kotur, TC. Weinacht, C. Zhou, S. Matsika, "Distinguishing between relaxation pathways by combining dissociative ionization pump probe spectroscopy and ab initio calculations: A case study of cytosine." Journal Of Chemical Physics. 134(18), 184309, (2011).