Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

[PDF] http://dx.doi.org/10.3952/lithjphys.44303

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 44, 199–218 (2004)

ATOMIC THEORY METHODS FOR THE POLARIZATION IN PHOTON AND ELECTRON INTERACTIONS WITH ATOMS
A. Kupliauskienė
Vilnius University Research Institute of Theoretical Physics and Astronomy, A. Goštauto 12, LT-01108 Vilnius, Lithuania
E-mail: akupl@itpa.lt

Received 20 February 2004

Dedicated to the 100th anniversary of Professor A. Jucys

An alternative method to the density matrix formalism for the derivation of general expressions for the cross-sections of the interaction of polarized atoms with polarized photons and electrons is presented. The expression for the cross-section describing the polarization states of all particles taking part in the process are obtained in the form of the expansion via irreducible tensors that have the simplest possible behaviour under changes of directions. The ways of the application of the general expressions suitable for the specific experimental conditions are outlined by deriving asymmetry parameters of the angular distributions of photoelectrons and Auger electrons following photoionization as well as the parameters of the angular correlations between photo- and Auger electrons.

Keywords: photon interactions with atoms, electron scattering
PACS: 32.80.–t, 34.80.–i

ATOMO TEORIJOS METODAI ATOMŲ SĄVEIKAI SU FOTONAIS IR ELEKTRONAIS TIRTI
A. Kupliauskienė
VU Teorinės fizikos ir astronomijos institutas, Vilnius, Lietuva

Sklaidos uždaviniuose sklaidomosios dalelės kryptis yra apibrėžta, todėl reakcijos produktų būsenų užpildai būdinga asimetrija šios krypties atžvilgiu. Iki šiol tokia poliarizacija ir asimetrija buvo tiriamos tankio matricos metodais. Prieš ketvertą metų poliarizacijos reiškiniams, kai atomai ir jonai sąveikauja su elektronais ir fotonais, nagrinėti buvo pritaikyti atomo teorijos metodai, kurie iki šiol buvo taikomi izoliuotiems atomams tirti, neatsižvelgiant į išskirtą kryptį erdvėje. Apžvelgti darbai, skirti poliarizuotų atomų sąveikos su poliarizuotais fotonais ir elektronais skerspjūvių bendriausioms išraiškoms nereliatyvistiniu artėjimu surasti. Judėjimo kiekio momento grafinė technika pritaikyta šuolio operatorių matricinių elementų kvadratams integruoti kampinių ir sumuoti sukininių kintamųjų atžvilgiu. Skerspjūvių išraiškos užrašytos daugialypiais sferinių multipolių skleidiniais, kadangi sferiniai tenzoriai transformuojasi paprasčiausiai, keičiant matavimo kryptis. Pateiktas būdas fotonų ar elektronų spinduliuotei po atomo ar jono jonizacijos, sužadinimo ar rekombinacijos dvipakopiu artėjimu nagrinėti.
Išnagrinėti svarbiausi plazmoje vykstantys vyksmai: atomų ir jonų sužadinimas ir jonizacija fotonais bei elektronais, jono ir elektrono fotorekombinacija, spinduliavimo ir Auger šuoliai sužadintuose ir jonizuotuose atomuose. Dvipakopį vyksmą iliustruoja dvielektronė rekombinacija. Taip pat parodyta, kaip galima surasti skerspjūvių išraiškas konkretiems eksperimentams aprašyti. Visų išraiškų forma paprasta, patogi kompiuterinėms programoms rašyti.

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