NON-FRANCK–CONDON EFFECTS IN THE PHOTOIONIZATION OFN2TO THE${\rm N}_2^+$A2ΠuSTATE AND OFO2TO THE${\rm O}_2^+$X2ΠgSTATE IN THE 19–34eV PHOTON ENERGY REGION

J. Rius I Riu (), J. Álvarez, A. Karawajczyk, M. Stankiewicz, P. Winiarczyk and L. Veseth
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J. Rius I Riu: SCFAB, Section of Atomic and Molecular Physics (KTH), SE-10691 Stockholm, Sweden
J. Álvarez: SCFAB, Section of Atomic and Molecular Physics (KTH), SE-10691 Stockholm, Sweden
A. Karawajczyk: SCFAB, Section of Atomic and Molecular Physics (KTH), SE-10691 Stockholm, Sweden
M. Stankiewicz: Instytut Fizyki im. Mariana Smoluchowskiego, Uniwersytet Jagiellonski, ul. Reymonta 4, 30-059 Kraków, Poland
P. Winiarczyk: Instytut Fizyki im. Mariana Smoluchowskiego, Uniwersytet Jagiellonski, ul. Reymonta 4, 30-059 Kraków, Poland
L. Veseth: Department of Physics, University of Oslo, N-0316 Oslo, Norway

Surface Review and Letters (SRL), 2002, vol. 09, issue 01, 147-152

Abstract: Photoionization to the${\rm N}_2^+$A2Πustate and to the${\rm O}_2^+$X2Πgstate is studied using photoelectron spectroscopy. The experimental vibrational branching ratios are obtained for the first time in the 19–34 eV region for thev′ = 0–3levels, for both molecules.Ab initiomany-body perturbation theory is used to calculate branching ratios for ionization to the${\rm N}_2^+$A2Πustate and branching ratios, vibrationally resolved partial cross sections and total cross section for ionization to the${\rm O}_2^+$X2Πgstate. The Franck–Condon breakdown observed in the photoionization of theN21πuelectron is mainly explained by autoionization from Rydberg and valence states ofN2, whereas photoionization of theO2πgelectron is not fully explained either by channel coupling effects or by autoionization from known Rydberg series and valence states.

Date: 2002
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DOI: 10.1142/S0218625X02002051

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