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High‐pressure Raman study of methyl iodide (CH 3 I and CD 3 I) up to 12 GPa
Author(s) -
Wu Y. H.,
Sasaki S.,
Shimizu H.
Publication year - 1992
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250230804
Subject(s) - raman spectroscopy , chemistry , diamond anvil cell , phase transition , phase (matter) , methyl iodide , high pressure , crystal (programming language) , diamond , analytical chemistry (journal) , iodide , crystallography , thermodynamics , inorganic chemistry , organic chemistry , optics , computer science , programming language , physics
High‐pressure Raman spectra of liquid and crystalline CH 3 I and CD 3 I were measured up to 12 GPa at 300 K in a gasketed diamond‐anvil cell. The liquid‐solid phase transition pressures were determined as 0.9 GPa for CH 3 I and 0.8 GPa for CD 3 I. For both CH 3 I and CD 3 I, two translational and two librational modes were observed in the pressure‐induced solid phase. The frequencies of the librational modes increased rapidly with increasing pressure. The frequency of the intense ν 3 mode also increased rapidly with pressure. Splitting of fundamental modes was found in the solid phase, and this behaviour is discussed in terms of crystal field effects.