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[Fizinfo] Szemináriumok - Seminars: Sándor Péter

Chronological Thread 
  • From: Szeminárium koordinátor <sem-admin AT>
  • To: SZFI Szeminárium <seminar AT>,Fizinfo <fizinfo AT>
  • Cc: Fizinfo <fizinfo AT>
  • Subject: [Fizinfo] Szemináriumok - Seminars: Sándor Péter
  • Date: Thu, 22 Oct 2020 06:26:01 +0200 (CEST)
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SZFI SeminarSándor PéterWigner RCP SZFIMolecular Strong-Field Ionization
viewed with Photoelectron Velocity Map ImagingTuesday, 27 October 2020,
10:00, video conference,
ionization is the key first step of the 3-step model which explains phenomena
such as high-harmonic generation and attosecond pulse generation, which are
currently at the forefront of ultrafast science. By understanding the changes
that ionization brings about in the atomic/molecular system, one hopes to
make the latter two processes more efficient. In my talk I will highlight
experiments of molecular strong-field ionization that show that in contrast
to earlier assumptions, even at the lowest intensities required for
multi-photon ionization, not just the lowest energy, but higher-lying ionic
states are also populated. For halogenated methane molecules (systems that
can be regarded as essentially triatomic), different ionization-dissociation
pathways are identified with the help of a coincidence Velocity Map Imaging
apparatus that maps photoelectrons according to their vector momentum in
coincidence with the accompanying ion. Furthermore, we follow nonadiabatic
temporal dynamics of the electronic structure of the ion on a few tens of
femtoseconds scale with using ultrashort pulses of ~9 fs in duration and
interpret the results with ab-initio electronic structure calculations. We
find that the dynamics on the neutral and ionic state potentials are not
solely driven by the color content of the exciting laser pulses, but instead
it is really their shortness in time—relative to nuclear motion—that
determines the outcome of the experiment. This result has the implication
that one can indeed 'freeze' the effects of molecular vibrations on
photoionization if the interaction time is kept sufficiently
short.&nbsp;Minden érdeklődőt szívesen látunk! - Everyone is welcome to
attend.Róbert Juhászsem-admin AT

  • [Fizinfo] Szemináriumok - Seminars: Sándor Péter, Szeminárium koordinátor, 10/22/2020

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