1 December 1989 The Vibron-Phonon Sidebands In The FTIR Spectra Of The Molecular Crystal CO2
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Proceedings Volume 1145, 7th Intl Conf on Fourier Transform Spectroscopy; (1989) https://doi.org/10.1117/12.969492
Event: Seventh International Conference on Fourier and Computerized Infrared Spectroscopy, 1989, Fairfax, VA, United States
Abstract
FTIR investigations on polycrystalline CO2 at various temperatures show Stokes and anti-Stokes sidebands coupled to the vibrational modes v3, v2 and v+/v- (Fermi dyad). The latter is infrared forbidden and may be eliminated from spectra of good quality polycristalline films. The main peaks in the structure of the sidebands may be assigned to phonons from points of highest symmetry in the Brillouin zone. The vibron-phonon coupling process is mode specific and driven by electrical anharmonicity in case of v+ v- For the infrared allowed fundamentals, and especially at the Γpoint, the coupling process is also driven by mechanical anharmonicity. The dispersion of these internal modes at 1.0 influences the coupled phonons and thus the one phonon density of states is correctly mirrored by the v+ and v- sidebands only.
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H. W. Lowen, K. D. Bier, H. J. Jodl, A. Lowenschuss, A. Givan, "The Vibron-Phonon Sidebands In The FTIR Spectra Of The Molecular Crystal CO2", Proc. SPIE 1145, 7th Intl Conf on Fourier Transform Spectroscopy, (1 December 1989); doi: 10.1117/12.969492; https://doi.org/10.1117/12.969492
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