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Energy shifts and forbidden transitions in H2+ due to electronic g/u symmetry breaking

Lookup NU author(s): Andrew Critchley, Dr Iain McNab

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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 (1sσg) of H2+. 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 1sσg (v = 19, N = 1)-2pσu(v = 0, N = 2) transition was estimated from the available measurements to be 8000, in reasonable agreement with the theoretically predicted value of ≈ 3000.

Publication metadata

Author(s): Critchley ADJ, Hughes AN, McNab IR, Moss RE

Publication type: Article

Publication status: Published

Journal: Molecular Physics

Year: 2003

Volume: 101

Issue: 4-5

Pages: 651-661

ISSN (print): 0026-8976

ISSN (electronic): 1362-3028

Publisher: Taylor & Francis

URL: http://dx.doi.org/10.1080/0026897021000021886

DOI: 10.1080/0026897021000021886

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