NON-FRANCK–CONDON EFFECTS IN THE PHOTOIONIZATION OF N2 TO THE ${\rm N}_2^+$ A 2Πu STATE AND OF O2 TO THE ${\rm O}_2^+$ X 2Πg STATE IN THE 19–34 eV PHOTON ENERGY REGION

Autor:	A. Karawajczyk, Piotr Winiarczyk, Jaume Rius i Riu, L. Veseth, Marek Stankiewicz, Jesus Alvarez Ruiz
Rok vydání:	2002
Předmět:	Valence (chemistry) Chemistry Photoionization mode Ab initio Surfaces and Interfaces Electron Photoionization Condensed Matter Physics Surfaces Coatings and Films symbols.namesake Autoionization Ionization Materials Chemistry Rydberg formula symbols Atomic physics
Zdroj:	Surface Review and Letters. :147-152
ISSN:	1793-6667 0218-625X
DOI:	10.1142/s0218625x02002051
Popis:	Photoionization to the [Formula: see text] A 2Πu state and to the [Formula: see text] X 2Πg state is studied using photoelectron spectroscopy. The experimental vibrational branching ratios are obtained for the first time in the 19–34 eV region for the v′ = 0–3 levels, for both molecules. Ab initio many-body perturbation theory is used to calculate branching ratios for ionization to the [Formula: see text] A 2Πu state and branching ratios, vibrationally resolved partial cross sections and total cross section for ionization to the [Formula: see text] X 2Πg state. The Franck–Condon breakdown observed in the photoionization of the N 2 1πu electron is mainly explained by autoionization from Rydberg and valence states of N 2, whereas photoionization of the O 2πg electron is not fully explained either by channel coupling effects or by autoionization from known Rydberg series and valence states.
Databáze:	OpenAIRE
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