[PDF]
http://dx.doi.org/10.3952/lithjphys.44302
Open access article / Atviros prieigos straipsnis
Lith. J. Phys. 44, 183–198 (2004)
INVESTIGATION OF THE CASCADES IN
ATOMS USING THE GLOBAL CHARACTERISTICS OF SPECTRA
R. Karazija, S. Kučas, and V. Jonauskas
Vilnius University Research Institute of Theoretical Physics
and Astronomy, A. Goštauto 12, LT-01108 Vilnius, Lithuania
Received 30 April 2004
Dedicated to the 100th anniversary of Professor A. Jucys
Following the creation of inner-shell vacancy
in an atom, the cascade of radiative and nonradiative transitions
takes place. It can be analysed employing the final charge
distribution of ions, the electron and characteristic emission
spectra. The development of the experimental and theoretical
investigation of cascades is shortly reviewed. The main attention
is paid to the description of a cascade using the global
characteristics of spectra, especially in the cases of transitions
between close-lying and overlapping configurations. Some
applications of the global characteristics method are given.
Keywords: cascade, Auger cascade, highly charged ions, global
characteristics
PACS: 32.80.Hd, 31.10.+z, 32.30.Rj
KASKADŲ ATOMUOSE TYRIMAS
NAUDOJANTIS BENDROSIOMIS SPEKTRŲ CHARAKTERISTIKOMIS
R. Karazija, S. Kučas, V. Jonauskas
VU Teorinės fizikos ir astronomijos institutas, Vilnius, Lietuva
Sukūrus atomo vidiniame sluoksnyje vakansiją,
vyksta radiacinių ir Auger šuolių kaskada. Jų metu atomas daug
kartų autojonizuojasi. Kaskados tiriamos, registruojant jonų
išeigos, emisijos ir Auger spektrus. Šioje apžvalgoje apibūdinami
teoriniai kaskadų nagrinėjimo metodai. Kadangi kaskadoje dalyvauja
šimtai ir net tūkstančiai konfigūracijų su keliais atvirais
sluoksniais, tai detalūs skaičiavimai yra sunkiai įmanomi.
Dažniausiai nagrinėjami šuoliai ne tarp atskirų lygmenų, bet tarp
konfigūracijų, naudojantis bendrosiomis spektrų charakteristikomis
– vidutine energija ir sumine tikimybe. Tačiau, vykstant šuoliams
tarp artimų arba persiklojančių konfigūracijų, reikia naudoti
aukštesnius spektrų momentus – dispersiją bei asimetrijos
koeficientą, kurių algebrinės išraiškos yra rastos tiek
nereliatyvistiniu, tiek reliatyvistiniu artėjimais. Pateikti
kaskadų lantanidų atomuose skaičiavimo rezultatai; jie palyginti
su eksperimentiniais spektrų duomenimis.
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