Hydrogen intramolecular stretch redshift in the electrostatic environment of type ii clathrate hydrates from Schrödinger equation treatment

Christian J. Burnham, Zdenek Futera, Zlatko Bačić, Niall J. English

Research output: Contribution to journalArticlepeer-review

Abstract

The one-dimensional Schrödinger equation, applied to the H2 intramolecular stretch coordinate in singly to quadruply occupied large cages in extended Type II (sII) hydrogen clathrate hydrate, was solved numerically herein via potential-energy scans from classical molecular dynamics (MD), employing bespoke force-matched H2–water potential. For both occupation cases, the resultant H–H stretch spectra were redshifted by ~350 cm−1 vis-à-vis their classically sampled counterparts, yielding semi-quantitative agreement with experimental Raman spectra. In addition, ab initio MD was carried out systematically for different cage occupations in the extended sII hydrate to assess the effect of differing intra-cage intrinsic electric field milieux on H–H stretch frequencies; we suggest that spatial heterogeneity of the electrostatic environment is responsible for some degree of peak splitting.

Original languageEnglish (US)
Article number8504
Pages (from-to)1-13
Number of pages13
JournalApplied Sciences (Switzerland)
Volume10
Issue number23
DOIs
StatePublished - Dec 1 2020

Keywords

  • Cages
  • Clathrate hydrate
  • Confinement
  • Electric field
  • Hydrogen
  • Nuclear quantum effects
  • Redshift
  • Schrödinger

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Engineering(all)
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes

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