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RAMAN SPECTRA OF SOLID MOLECULAR NITROGEN

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/17271

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Title: RAMAN SPECTRA OF SOLID MOLECULAR NITROGEN
Creators: Guelachvili, G.; Pangilinan, G. I.; Tipping, R. H.; Rao, K. Narahari; Sooryakumar, R.
Issue Date: 1987
Abstract: Due to the simpler geometrical arrangement, the theoretical interpretation of molecular interactions may be easier in the lattice than in the gas phase. In the case of the nitrogen molecule, the structure of the solid at normal pressure is known. A phase transition occurs at a temperature $T_{ph} = 35.6K$. The crystal is cubic $(\alpha-N_{2}$ ) for $T < T_{ph}$, and hexagonal $(beta-N_{2})$ for $T > T_{ph}$. This paper reports preliminary results of a Raman scattering study on single crystal $N_{2}$. The experiment is specifically designed to investigate the effect of the above structural phase transition on the molecular and phonon excitations. The crystal $(4\times 2 \times 2 cm)$ is grown in a cryostat where the temperature is servo controlled over a large domain by appropriate heating of a flow of gaseous helium. The spectra are excited with a krypton laser and the scattered beam recorded with a spectral resolution equal to about $1 cm^{-1}$. The crystal cell, the optical system to enhance the signal to noise ratio and the growth technique are also described.
URI: http://hdl.handle.net/1811/17271
Other Identifiers: 1987-RC-5
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