title: Ro-vibrational Spectra of (para-H2)N-CH4in He Droplets.
abstract: In this work, we report on the infrared spectroscopic study of clusters of CH4molecules 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 υ3band of CH4decrease gradually. In the range of 6 ≤N≤12, the spectra indicate some abrupt changes of B and υ3with 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.
authors.affiliation: Department of Chemistry, University of Southern California, Los Angeles, CA, 90089, USA.|Terahertz Sensing and Imaging Laboratory, RIKEN, 519-1399 Aramaki-Aoba, Aoba-ku, Sendai, Miyagi, 980-0845, Japan.
authors.forename: Hiromichi
authors.initials: H
authors.lastname: Hoshina
authors.affiliation: Department of Chemistry, University of Southern California, Los Angeles, CA, 90089, USA.|KLA-Tencor, 1 Technology Drive, Milpitas, CA, 95035, USA.
authors.forename: Russell
authors.initials: R
authors.lastname: Sliter
authors.affiliation: Department of Chemistry, The University of British Columbia, Vancouver, BC, V6T 1Z1, Canada.|Department of Physics, Harvard University, 17 Oxford Street, Cambridge, MA, 02138, USA.
authors.forename: Aakash
authors.initials: A
authors.lastname: Ravi
authors.affiliation: Department of Chemistry, The University of British Columbia, Vancouver, BC, V6T 1Z1, Canada.|Atomic, Molecular & Optical Physics Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
authors.forename: Susumu
authors.initials: S
authors.lastname: Kuma
authors.affiliation: Department of Chemistry, The University of British Columbia, Vancouver, BC, V6T 1Z1, Canada.
authors.forename: Takamasa
authors.initials: T
authors.lastname: Momose
authors.affiliation: Department of Chemistry, University of Southern California, Los Angeles, CA, 90089, USA.
authors.forename: Andrey F
authors.initials: AF
authors.lastname: Vilesov
keywords: helium droplets; infrared spectroscopy; methane clusters; para-hydrogen; superfluid hydrogen