Publication
- Names
-
- Roberto Bini
- Title
- High-resolution infrared study of the translational lattice modes in α-N$_2$ single crystals
- Abstract
- The analysis of the far infrared spectrum of thin high quality α-N$_2$ single crystals as a function of temperature was carried out by high resolution Fourier-transform infrared spectroscopy. The bandwidths at T=8 K of the two translational modes, correlated to the two-phonon density of states, are considerably smaller than the Raman active modes. This result can be interpreted on the basis of a lower anharmonicity of the translations with respect to the librational modes. The α-N$_2$ is the first molecular crystal where such difference is found. The evolution of the T$^(1)_u$ linewidth was studied until the α-β phase transition. The relaxation of this mode is essentially dominated by fourth-order decay processes. The study of the frequency shifts of both infrared phonons allowed the contributions relative to different orders of the anharmonic potential to be separated. Finally a careful analysis of the relative intensities of the two phonons was carried out in the α phase.
- Keywords
- spectroscopy, transmission spectra, far-IR, band position, band width, band vibration mode, temperature, ices, molecular solids, N2
- Content
- spectral data, band list data, experimental physics
- Year
- 1996
- Journal
- Journal of Chemical Physics
- Volume
- 104
- Number
- 12
- Pages
- 4365 - 4370
- Document type
- article
- Publication state
- published
- Doi
- 10.1063/1.471187
- Identifiers
-
- bibcode: 1996JChPh.104.4365B