Observation of a new electronic state of CO perturbing W{sup 1}Π(υ=1)

Journal Article · Tue Oct 14 04:00:00 EDT 2014 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4897326· OSTI ID:22436582

Eidelsberg, M.; Lemaire, J. L.; Gavilan, L. ^[1]; Stark, G. ^[2]; Federman, S. R. ^[3]; Lewis, B. R. ^[4]; Lyons, J. R. ^[5]; Oliveira, N. de; Joyeux, D. ^[6]

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1. Observatoire de Paris, LERMA and UMR 8112 du CNRS, 5 place Jules Janssen, 92195 Meudon (France)
2. Department of Physics, Wellesley College, Wellesley, Massachusetts 02481 (United States)
3. Department of Physics and Astronomy, University of Toledo, Toledo, Ohio 43606 (United States)
4. Research School of Physics and Engineering, The Australian National University, ACT 0200 Canberra (Australia)
5. School of Earth and Space Exploration, Arizona State University, 781 S. Terrace Rd, Tempe, Arizona 85281 (United States)
6. Synchrotron SOLEIL, Orme de Merisiers, St. Aubin, BP 48, 91192 Gif sur Yvette Cedex (France)

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 υ = 0 level of a previously unobserved {sup 1}Π state predicted by ab initio calculations to occur with the correct symmetry and equilibrium internuclear distance. We label this new state E{sup ″} {sup 1}Π. Both of the interacting levels W(1) and E{sup ″}(0) are predissociated, leading to dramatic interference effects in their corresponding linewidths.

• OSTI ID: 22436582
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 14 Vol. 141; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CARBON MONOXIDE
CROSS SECTIONS
ELECTRONS
FOURIER TRANSFORM SPECTROMETERS
SYNCHROTRON RADIATION SOURCES