Vibrational modes of methane in the structure H clathrate hydrate from ab initio molecular dynamics simulation

Masaki Hiratsuka, Ryo Ohmura, Amadeu K. Sum, Kenji Yasuoka

研究成果: Article査読

26 被引用数 (Scopus)

抄録

Vibrational spectra of guest molecules in clathrate hydrates are frequently measured to determine the characteristic signatures of the molecular environment and dynamical properties of guest-host interactions. Here, we present results of our study on the vibrational frequencies of methane molecules in structure H clathrate hydrates, namely, in the 5 12 and 4 35 66 3 cages, as the frequencies of stretching vibrational modes in these environments are still unclear. The vibrational spectra of methane molecules in structure H clathrate hydrate were obtained from ab initio molecular dynamics simulation and computed from Fourier transform of autocorrelation functions for each distinct vibrational mode. The calculated symmetric and asymmetric stretching vibrational frequencies of methane molecules were found to be lower in the 4 35 66 3 cages than in the 5 12 cages (3.8 cm -1 for symmetric stretching and 6.0 cm -1 for asymmetric stretching). The C-H bond length and average distance between methane molecules and host-water molecules in 4 35 66 3 cages were slightly longer than those in the 5 12 cages.

本文言語English
論文番号144306
ジャーナルJournal of Chemical Physics
137
14
DOI
出版ステータスPublished - 2012 10 14

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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