ELFT HÍRADÓ

[Csete Maria <mcsete AT physx.u-szeged.hu>]

Tiszelt Fizinfo Olvasok,

kettos idopont-modositasra szeretnem felhivni a figyelmet:
alabbi szeminarium december 2-an (szerdan) es 15 orakor lesz megtartva
a helyszin es minden tovabbi informacio valtozatlan a meghivoban.

Meghívó

SZTE TTIK Fizikus Tanszékcsoport Szemináriuma

El?adó: Prof. T?kési Károly, tudományos tanácsadó
MTA Atommagkutató Intézet, Elektronikai Osztály

Cím: Ionization by intense and short electric pulses - classical picture

Id?pont: 2015. december 2, 15 h

Helyszín: SZTE TTIK, Bay Zoltán tanterem, Szeged, Tisza Lajos körút. 84-86.

Absztrakt:

We present theoretical studies of the ionization of simple targets like 
hydrogen atom, positronium and water molecule as a result of the interaction 
with an ultrashort external electric field. Doubly-differential momentum 
distributions and angular momentum distributions of ejected electrons 
calculated in the framework of the Coulomb-Volkov and strong field 
approximations, as well as classical calculations are compared with the exact 
solution of the time dependent Schrödinger equation. We show that in the 
impulsive limit, the Coulomb-Volkov distorted wave theory reproduces the exact 
solution. The validity of the strong field approximation is probed both 
classically and quantum mechanically.
We show that classical mechanics describes the proper quantum momentum 
distributions of the ejected electrons right after a sudden momentum transfer, 
however pronounced the differences at latter stages that arise during the 
subsequent electron-nucleus interaction. Although, the classical calculations 
reproduce the quantum momentum distributions, it fails to describe properly the 
angular momentum distributions, even in the limit of strong fields. The origin 
of this failure can be attributed to the difference between quantum and 
classical initial spatial distributions.
For the case of water molecule target, single active electron and frozen core 
calculations were performed within the hydrogenic approximation. Electrons from 
the highest occupied molecular orbital 1b1 were considered. We demonstrate that 
the agreement between the classical and quantum mechanical calculation at high 
intensities is excellent, where the over-the-barrier ionization mechanism is 
dominant.

Minden érdekl?d?t szeretettel várunk.

Dr. Csete Mária
szeminarium-koordinator


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