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Low-frequency anharmonic couplings in bromoform revealed from 2D Raman-THz spectroscopy: From the liquid to the crystalline phase.

Authors :
Mousavi, Seyyed Jabbar
Berger, Arian
Hamm, Peter
Shalit, Andrey
Source :
Journal of Chemical Physics; 2022, Vol. 156 Issue 17, p1-7, 7p
Publication Year :
2022

Abstract

Two-dimensional (2D) Raman-THz spectroscopy in the frequency of up to 7 THz has been applied to study the crystalline β-phase of bromoform (CHBr<subscript>3</subscript>). As for liquid CHBr<subscript>3</subscript>, cross peaks are observed, which, however, sharpen up in the crystalline sample and split into assignable sub-contributions. In the Raman dimension, the frequency positions of these cross peaks coincide with the intramolecular bending modes of the CHBr<subscript>3</subscript> molecules and in the THz dimension with the IR-active lattice modes of the crystal. This work expands the applicability of this new 2D spectroscopic technique to solid samples at cryogenic temperatures. Furthermore, it provides new experimental evidence that the cross peaks, indeed, originate from the coupling between intra- and intermolecular vibrational modes. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00219606
Volume :
156
Issue :
17
Database :
Complementary Index
Journal :
Journal of Chemical Physics
Publication Type :
Academic Journal
Accession number :
156737020
Full Text :
https://doi.org/10.1063/5.0090520