Journal of Physical Studies 5(3/4), 255–260 (2001) DOI: https://doi.org/10.30970/jps.05.255 TIME-RESOLVED PHOTOELECTRON SPECTROMETRY OF A DEPHASING PROCESS IN PYRAZINE L. I. Pavlov{1}, S. I. Pavlova{2}, R. L. Pavlov{1}, Ya. I. Delchev{1} {1}Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences 72 Tzarigradsko Chaussee Blvd, BG–1784 Sofia, Bulgaria {2}Departement of Ed. Physics, Faculty of Physics St. Kl. Ohridski University of Sofia, Blvd. J. Bourchier 5, BG–1164 Sofia, Bulgaria

The proposed time-resolved spectrometry is of high temporal resolution within the femtosecond scale. Recently, performing of real-time studies of molecular dynamics is of great interest. The photoelectron spectrometry exhibits high sensitivity, since photoionization is an induced process and the electrons can be collected efficiently by an electromagnetic field. Such method is applied to ultrafast dephasing process in molecular pyrazine. The photoelectron imaging allows measurements of speed and angular distributions with unit collection efficiency of electrons. We should note that the photoelectron imaging probes short range and short time dynamics involving the electronic relaxation. The method is characterized by photoionization of NO and further applied to ultrafast dephasing in pyrazine. The combination of time-resolved photoelectron and photoion imaging will allow us to observe photo-induced dynamics of molecules and clusters from time $t = 0$ to $ınfty$ with a single apparatus. The experimental results are compared with the theoretical analysis of strong impact onto the multi-electron systems.

PACS number(s): 31.70.Hq, 34.50.Gb, 33.80.Rv

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