Ultra-Short Lived Non-Rydberg Doubly Excited Resonances Observed in Molecular Photoionization of CO and N2 Molecules
P. Erman, A. Karawajczyk, U. Köble, E. Rachlew, M. Stankiewicz, K. Yoshiki-Franzen
Department of Physics I, Royal Institute of Technology, 10044 Stockholm, Sweden

and L. Veseth
Department of Physics, University of Oslo, 0316 Oslo, Norway
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Our group has recently carried out measurements of dispersed fluorescence from photo-excited N2 and CO molecules in 19-34 eV excitation energy range using the Swedish synchrotron radiation facility MAX in Lund. The experimental results show that relative intensities of the fluorescence from different vibrational levels of the excited N2+ and CO+ vary with the excitation energy. We associate this phenomenon with the existence of doubly excited states in N2 and CO in the corresponding energy regions. Our results show that the widths of the newly revealed states correspond to their lifetimes of the order of few femtoseconds.
DOI: 10.12693/APhysPolA.91.763
PACS numbers: 33.80.Eh