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Ultra-Short Lived Non-Rydberg Doubly Excited Resonances Observed in Molecular Photoionization of CO and N_{2} Molecules

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Erman P., Karawajczyk A., Köble U., Rachlew E., Stankiewicz M., Yoshiki-Franzen K., Veseth L.

Acta Physica Polonica A

1997

vol. 91

issue 4

763-767

Our group has recently carried out measurements of dispersed fluorescence from photo-excited N_{2} 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 N_{2}^{+} and CO^{+} vary with the excitation energy. We associate this phenomenon with the existence of doubly excited states in N_{2} 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.

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1 Acta Physica Polonica A

1 1997

1 Erman P.

1 Karawajczyk A.

1 Köble U.

1 Rachlew E.

1 Stankiewicz M.

1 Veseth L.

1 Yoshiki-Franzen K.

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Ultra-Short Lived Non-Rydberg Doubly Excited Resonances Observed in Molecular Photoionization of CO and N_{2} Molecules