Premium
Anharmonic effects in Raman‐active modes of PbCl 2
Author(s) -
Melo F. E. A.,
Filho J. Mendes,
Moreira J. E.,
Lemos V.,
Cerdeira F.
Publication year - 1984
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.1250150212
Subject(s) - anharmonicity , raman spectroscopy , chemistry , hydrostatic pressure , amplitude , thermal expansion , hydrostatic equilibrium , normal mode , thermal , ion , molecular vibration , vibration , analytical chemistry (journal) , molecular physics , thermodynamics , condensed matter physics , physics , optics , organic chemistry , quantum mechanics
The behaviour of representative lines in the room temperature Raman spectrum of PbCl 2 under the influence of a high hydrostatic pressure (up to 80 kbar) is reported. Pressure derivatives and mode Grüneisen parameters are calculated for 13 of the 18 Raman‐active modes. Combining these results with previous data for the temperature dependence of these phono frequencies, the implicit (thermal expansion) and explicit (vibrational amplitude‐driven) contributions are separated from ω j ( T ). This separation shows that anharmonic effects are stronger for vibrations involving motion of chlorine ions than for those involving only lead atoms.