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Energy shifts and forbidden transitions in H-2(+) due to electronic g/u symmetry breaking

Energy shifts and forbidden transitions in H-2(+) due to electronic g/u symmetry breaking
Energy shifts and forbidden transitions in H-2(+) due to electronic g/u symmetry breaking
A full account is given of calculations and measurements of transition frequencies and intensities of the forbidden pure rotation transition (v = 19, N = 1)-(v = 19, N = 0) in the ground electronic state (1ssigma(g)) of H-2(+). The transition has measurable intensity because of ortho-para mixing that arises from electronic g/u symmetry breaking caused by the Fermi contact hyperfine interaction. Measurements of the transition were made in both single and double resonance using a fast ion beam/microwave spectrometer. The transition frequency was determined to be at 14 961.7 +/- 1.1 MHz (95% confidence, 5 measurements), in excellent agreement with the theoretical prediction of 14 960 +/- 3 MHz. The intensity of the transition relative to the allowed 1ssigma(g)(v = 19, N = 1)-2psigma(u) (v = 0, N = 2) transition was estimated from the available measurements to be 8000, in reasonable agreement with the theoretically predicted value of approximate to 3000.
homonuclear diatomic-molecules, absorption-coefficients, ion, spectroscopy, collisions, rotation, hydrogen, dissociation, spectrum, states
0026-8976
651-661
Critchley, A.D.J.
c72b57ba-e805-4c93-8258-859d74d62bfd
Hughes, A.N.
c3bfe667-51e0-401a-8d46-57b53bf37f3d
McNab, I.R.
e34346f7-ff3b-490d-9ad3-68c9825bef95
Moss, R.E.
5d410492-850a-4950-85fd-2deb89f60859
Critchley, A.D.J.
c72b57ba-e805-4c93-8258-859d74d62bfd
Hughes, A.N.
c3bfe667-51e0-401a-8d46-57b53bf37f3d
McNab, I.R.
e34346f7-ff3b-490d-9ad3-68c9825bef95
Moss, R.E.
5d410492-850a-4950-85fd-2deb89f60859

Critchley, A.D.J., Hughes, A.N., McNab, I.R. and Moss, R.E. (2003) Energy shifts and forbidden transitions in H-2(+) due to electronic g/u symmetry breaking. Molecular Physics, 101 (4-5), 651-661. (doi:10.1080/0026897021000021886).

Record type: Article

Abstract

A full account is given of calculations and measurements of transition frequencies and intensities of the forbidden pure rotation transition (v = 19, N = 1)-(v = 19, N = 0) in the ground electronic state (1ssigma(g)) of H-2(+). The transition has measurable intensity because of ortho-para mixing that arises from electronic g/u symmetry breaking caused by the Fermi contact hyperfine interaction. Measurements of the transition were made in both single and double resonance using a fast ion beam/microwave spectrometer. The transition frequency was determined to be at 14 961.7 +/- 1.1 MHz (95% confidence, 5 measurements), in excellent agreement with the theoretical prediction of 14 960 +/- 3 MHz. The intensity of the transition relative to the allowed 1ssigma(g)(v = 19, N = 1)-2psigma(u) (v = 0, N = 2) transition was estimated from the available measurements to be 8000, in reasonable agreement with the theoretically predicted value of approximate to 3000.

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More information

Published date: 2003
Keywords: homonuclear diatomic-molecules, absorption-coefficients, ion, spectroscopy, collisions, rotation, hydrogen, dissociation, spectrum, states

Identifiers

Local EPrints ID: 19937
URI: https://eprints.soton.ac.uk/id/eprint/19937
ISSN: 0026-8976
PURE UUID: 170ffd5a-a9a0-40bd-8bea-dd4b5232c16e

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Date deposited: 24 Feb 2006
Last modified: 15 Jul 2019 19:26

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Contributors

Author: A.D.J. Critchley
Author: A.N. Hughes
Author: I.R. McNab
Author: R.E. Moss

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