Benshalom Nimrod, Asher Maor, Jouclas Rémy, Korobko Roman, Schweicher Guillaume, Liu Jie, Geerts Yves, Hellman Olle, Yaffe Omer
Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
Laboratoire de Chimie des Polymères, Universit́e Libre de Bruxelles (ULB), Brussels 1050, Belgium.
J Phys Chem C Nanomater Interfaces. 2023 Aug 31;127(36):18099-18106. doi: 10.1021/acs.jpcc.3c03850. eCollection 2023 Sep 14.
We have found that the polarization dependence of Raman scattering in organic crystals at finite temperatures can only be described by a fourth-rank tensor formalism. This generalization of the second-rank Raman tensor stems from the effect of off-diagonal components in the crystal self-energy on the light scattering mechanism. We thus establish a novel manifestation of phonon-phonon interaction in inelastic light scattering, markedly separate from the better-known phonon lifetime.
我们发现，在有限温度下有机晶体中拉曼散射的偏振依赖性只能用四阶张量形式来描述。这种二阶拉曼张量的推广源于晶体自能中非对角分量对光散射机制的影响。因此，我们在非弹性光散射中建立了一种新的声子 - 声子相互作用表现形式，明显不同于更为人熟知的声子寿命。
