https://doi.org/10.1051/epjconf/20158403004
Indirect predissociation of highly excited singlet states of N2
1 Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands
2 Research School of Physics and Engineering, The Australian National University, Canberra, Australian Capital Territory 0200, Australia
3 Department of Physics, Wellesley College, Wellesley, Massachusetts 02481, USA
4 Synchrotron Soleil, Orme des Merisiers, St. Aubin, BP. 48, 91192 Gif-sur-Yvette Cedex, France
a Corresponding author: heays@strw.leidenuniv.nl
Published online: 29 January 2015
Indirect predissociation of the b′ 1Σu+(v = 20) level of N2 is studied experimentally by vacuum-ultraviolet photoabsorption employing synchrotron radiation and a Fourier-transform spectrometer, and interpreted with the aid of a quantitative model of interacting 1Πu and 1Σu+, bound and unbound states which solves the coupled Schrödinger equation. An observed rotationally-localised peak in the b′(20) predissociation linewidths is identified by the model as arising from an interaction with a strongly predissociated and unobserved bound level of the mixed c3 1Πu and o3 1Πu Rydberg states. This leads to the dissociation of b′(20) into the continuum of the b 1Πu valence state. The residual observed predissociation of b′ 1Σu+(v = 20) apart from the rotationally-localised peak cannot be explained by a mechanism of 1Πu and 1Σu+ interaction, and must involve states of higher multiplicity.
© Owned by the authors, published by EDP Sciences, 2015
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