Publication Date:
2014-10-15
Description:
We observe photoabsorption of the W (1) ← X (0) band in five carbon monoxide isotopologues with a vacuum-ultraviolet Fourier-transform spectrometer and a synchrotron radiation source. We deduce transition energies, integrated cross sections, and natural linewidths of the observed rotational transitions and find a perturbation affecting these. Following a deperturbation analysis of all five isotopologues, the perturbing state is assigned to the v = 0 level of a previously unobserved 1 Π state predicted by ab initio calculations to occur with the correct symmetry and equilibrium internuclear distance. We label this new state E ″ 1 Π. Both of the interacting levels W (1) and E ″ (0) are predissociated, leading to dramatic interference effects in their corresponding linewidths.
Print ISSN:
0021-9606
Electronic ISSN:
1089-7690
Topics:
Chemistry and Pharmacology
,
Physics
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