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Berlin 2001 – wissenschaftliches Programm

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MO: Molekülphysik

MO 4: Posters Tuesday: Photoionisation

MO 4.6: Poster

Dienstag, 3. April 2001, 12:30–15:00, AT3

Non Franck-Condon effects in the photoionization of molecular oxygen to the O2+ X 2Πg state and of molecular nitrogen to the N2+ A 2Πu state in the 19-34 eV photon energy range. — •Jaume Rius i Riu1, Peter Erman1, Andrzej Karawajczyk1, Elisabeth Rachlew1, Marek Stankiewicz2, Leif Veseth3, and Piotr Winiarczyk21Sect. of Atomic and Molecular Physics, Department of Physics, Royal Institute of Technology, KTH, SE 10044 Stockholm, Sweden — 2Instytut Fizyki im. Mariana Smoluchowskiegeo, Univ. Jagiellonski, ul. Reymonta 4, 30-059 Krakow, Poland — 3Department of Physics, Univ. of Oslo, N-0316 Oslo, Norway

Photoionization to the O2+ X 2Πg state and to the N2+ A 2Πu state is studied using photoelectron spectroscopy.

In the case of molecular oxygen, the vibrational branching ratios for the v = 0-3 levels are recorded in the 19-31 eV region. Using many body perturbation theory, branching ratios and cross sections are calculated. Molecular states which autoionize to the O2+ X 2Πg state continuum are discussed.

In the case of molecular nitrogen, the branching ratios for the v = 0-3 levels are recorded in the 20-34 eV region showing strong non Franck-Condon effects around 22 eV. The study indicates that the Franck-Condon breakdown in the photoionization of the N2u electron is due to autoionization from Rydberg and valence states of N2.

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