Observation of a new electronic state of CO perturbing W1Π (v=1)

A. N. Heays; M. Eidelsberg; G. Stark; J. L. Lemaire; L. Gavilan; S. R. Federman; B. R. Lewis; James Lyons; N. De Oliveira; D. Joyeux

doi:10.1063/1.4897326

Observation of a new electronic state of CO perturbing W¹Π (v=1)

A. N. Heays, M. Eidelsberg, G. Stark, J. L. Lemaire, L. Gavilan, S. R. Federman, B. R. Lewis, James Lyons, N. De Oliveira, D. Joyeux

Earth and Space Exploration, School of (SESE)

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

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

Original language	English (US)
Article number	144311
Journal	Journal of Chemical Physics
Volume	141
Issue number	14
DOIs	https://doi.org/10.1063/1.4897326
State	Published - Oct 14 2014

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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10.1063/1.4897326

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title = "Observation of a new electronic state of CO perturbing W1Π (v=1)",

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

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T1 - Observation of a new electronic state of CO perturbing W1Π (v=1)

AU - Heays, A. N.

AU - Eidelsberg, M.

AU - Stark, G.

AU - Lemaire, J. L.

AU - Gavilan, L.

AU - Federman, S. R.

AU - Lewis, B. R.

AU - Lyons, James

AU - De Oliveira, N.

AU - Joyeux, D.

PY - 2014/10/14

Y1 - 2014/10/14

N2 - 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 1Π state predicted by ab initio calculations to occur with the correct symmetry and equilibrium internuclear distance. We label this new state E″ 1Π. Both of the interacting levels W(1) and E″(0) are predissociated, leading to dramatic interference effects in their corresponding linewidths.

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

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Observation of a new electronic state of CO perturbing W¹Π (v=1)

Abstract

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