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Updated: Mar 19, 2026

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Ro-vibrational Spectra of (para-H2 )N -CH4 in He Droplets
Hiromichi Hoshina1,2, Russell Sliter1,3, Aakash Ravi4,5
1Department of Chemistry, University of Southern California, Los Angeles, CA, 90089, USA.
Abstract:
In this work, we report on the infrared spectroscopic study of clusters of CH4 molecules with up to N=80 para-hydrogen molecules assembled inside He droplets. Upon increase of the number of the added para-hydrogen molecules up to about N=12, both the rotational constant, B, and the origin frequency of the υ3 band of CH4 decrease gradually. In the range of 6 ≤N≤12, the spectra indicate some abrupt changes of B and υ3 with both values being approximately constant at N≥12. The origin of this effect is discussed. Comparison of the spectra of methane molecules in para-hydrogen clusters to that in solid para-hydrogen is also presented.
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