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Spectroscopy and perturbation analysis of the CO A(1)pi -X-1 sigma(+) (2,0), (3,0) and (4,0) bands

Published on Mar 3, 2016in Molecular Physics1.571
· DOI :10.1080/00268976.2015.1108472
M. L. Niu4
Estimated H-index: 4
(VU: VU University Amsterdam),
M. L. Niu10
Estimated H-index: 10
(VU: VU University Amsterdam)
+ 3 AuthorsWim Ubachs41
Estimated H-index: 41
(VU: VU University Amsterdam)
Abstract
ABSTRACTThe (2,0) (3,0) and (4,0) bands of the A1Π −X1Σ+ system of 12C16O have been re-investigated by high-resolution vacuum ultraviolet absorption spectroscopy. A vacuum ultraviolet Fourier-transform spectrometer, illuminated by synchrotron radiation, was applied to record a jet-cooled spectrum, a room temperature static gas spectrum and a high-temperature (900 K) quasi-static gas spectrum, resulting in absolute accuracies of 0.01−0.02 cm−1 for the rotational line frequencies. Precise laser-based data were included in the analysis allowing for a highly accurate determination of band origins. Rotational levels up to J = 52 were observed. The data were used to perform an improved analysis of the perturbations in the A1Π, v = 2, v = 3 and v = 4 levels by vibrational levels of the D1Δ, I1Σ−, e3Σ−, d3Δ and a′3Σ+ states.
  • References (20)
  • Citations (9)
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Abstract Photoabsorption spectra of N 2 and CO were recorded at 900 K, using the vacuum-ultraviolet Fourier-transform spectrometer at the DESIRS beamline of synchrotron SOLEIL. These high-temperature and high-resolution measurements allow for precise determination of line wavelengths, oscillator strengths, and predissociative line broadening of highly-excited rotational states with J up to about 50, and also vibrational hot bands. In CO, the perturbations of the A 1 Π - X 1 Σ + vibrational bands...
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The two lowest-v′ (0,0) and (1,0) bands of the A1Π −X1Σ+ system of 12C16O have been investigated by two high-resolution spectroscopic methods. A vacuum ultraviolet Fourier-transform spectrometer, illuminated by synchrotron radiation, was applied to record a jet-cooled spectrum and a room temperature static gas spectrum, resulting in absolute accuracies of 0.01−0.02 cm−1. In addition two-photon Doppler-free laser spectroscopy has been applied to a limited number of rotational lines, resulting in ...
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Author Institution: Department of Physics and Astronomy, and LaserLaB, VU University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands; Synchrotron Soleil, Orme des Merisiers, St Aubin BP 48, 91192, GIF sur Yvette cedex, France; Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA; Department of Physics and Astronomy, and LaserLaB, VU University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
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