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

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.
Authors:
 [1] ; ; ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ; ;  [7]
  1. Leiden Observatory, Leiden University, P. O. Box 9513, 2300 RA Leiden (Netherlands)
  2. Observatoire de Paris, LERMA and UMR 8112 du CNRS, 5 place Jules Janssen, 92195 Meudon (France)
  3. Department of Physics, Wellesley College, Wellesley, Massachusetts 02481 (United States)
  4. Department of Physics and Astronomy, University of Toledo, Toledo, Ohio 43606 (United States)
  5. Research School of Physics and Engineering, The Australian National University, ACT 0200 Canberra (Australia)
  6. School of Earth and Space Exploration, Arizona State University, 781 S. Terrace Rd, Tempe, Arizona 85281 (United States)
  7. Synchrotron SOLEIL, Orme de Merisiers, St. Aubin, BP 48, 91192 Gif sur Yvette Cedex (France)
Publication Date:
OSTI Identifier:
22436582
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 141; Journal Issue: 14; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CARBON MONOXIDE; CROSS SECTIONS; ELECTRONS; FOURIER TRANSFORM SPECTROMETERS; SYNCHROTRON RADIATION SOURCES