Observation of the Rotational Spectra of 4 HeH+, 4 HeD+, 3 HeH+, and 3 HeD+

Details Observation of the Rotational Spectra of 4 HeH+, 4 HeD+, 3 HeH+, and 3 HeD+ Observation of the Rotational Spectra of 4 HeH+, 4 HeD+, 3 HeH+, and 3 HeD+

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phrvl..78.1664m&link_type=abstract

Physical Review Letters, Volume 78, Issue 9, March 3, 1997, pp.1664-1666

Physics

20

Scientific paper

Low J rotational transitions of 4HeH+, 4HeD+, 3HeH+, and 3HeD+ were observed in the 2-5 THz region with a high-precision far-infrared spectrometer. Dunham coefficients Ykl and isotopically independent parameters Ukl, ΔHekl, and ΔHkl were determined. In particular, Δ parameters with k = 0 and l = 1,2 were determined with unprecedented accuracy, and provide important information for breakdown of the Born-Oppenheimer approximation. The lowest J = 1<--0 transition of 4HeH+ observed at 2010.1839(2) GHz will be an important future probe for detecting this species in space.

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