Vibronic spectra of molecular crystals with participation of non-totally symmetrical vibrations

✍ Scribed by A. A. Serikov

• Publisher: John Wiley and Sons
• Year: 1971
• Tongue: English
• Weight: 668 KB
• Volume: 44
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/pssb.2220440232

✦ Synopsis

Abstract

An investigation is made of the vibronic spectra of molecular crystals for the case of a combination of the electronic excitation with the non‐totally symmetrical intramolecular vibration. It is shown that, depending on the crystal characteristics determining the values of the theoretical parameters, the excited states of the molecules in the crystal in the electronic‐vibrational frequency range can correspond with : a) vibronic excitons (stable or unstable) and, along with them, two‐particle excitations corresponding to the formation of electronic excitons and intramolecular phonons; b) localized electronic‐vibrational excitations (stable or unstable) of the groups of neighbouring molecules and, along with them, two‐particle excitations corresponding to an electronic excitation of one of the crystal molecules, and a phonon exciton. The shape of the absorption spectra as well as the intensities of the absorption bands corresponding to the different types of excitations are calculated.