'Forbidden' lines in the Raman spectrum of the alpha-HgI2 crystal

Details 'Forbidden' lines in the Raman spectrum of the alpha-HgI2 crystal 'Forbidden' lines in the Raman spectrum of the alpha-HgI2 crystal

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ukfiz..30.1331b&link_type=abstract

Ukrainskii Fizicheskii Zhurnal (ISSN 0503-1265), vol. 30, Sept. 1985, p. 1331-1335. In Russian.

Physics

Optics

1

Crystal Optics, Forbidden Bands, Light Scattering, Mercury Compounds, Visible Spectrum, Iodides, Laser Spectroscopy, Line Spectra, Single Crystals

Scientific paper

The Raman spectra of layered crystals of red mercury iodide (alpha-HgI2) have been investigated experimentally using scattered pulses from a krypton laser. A total of seven new lines having intensities 1000 times lower than the intensities of the four well-known lines in the first-order Raman spectrum were found. The new lines coincided with three LO-TO split vibrational modes: (A2-)2; (E-)2; (E-)3; and the inactive mode B-B2(-) which is forbidden in dipole approximations of the Raman spectrum of alpha-HgI2. The phonon dispersion curves of alpha-HgI2 are plotted in a graph in the Gamma-Z direction near the Brillouin zone.

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