๐”– Bobbio Scriptorium
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The superposition of the lattice radiation and reflectivity spectra of MoO3 and PbMoO4 crystals

โœ Scribed by Prof. Dr. N. N. Syrbu; Dr. I. G. Stamov

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
718 KB
Volume
29
Category
Article
ISSN
0232-1300

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โœฆ Synopsis

The Raman scattering of MOO, at 300 and 77 K and the infrared reflectivity spectra of MOO, at 300 K have been investigated in different scattering geometries. The Raman spectra of PbMoO, crystals at 77 K have been investigated also. The reflectivity spectra of MOO, crystals were calculated for E 11 c and E 11 u. The phonon parameters and the effective ionic charges of anions and cations for MOO, and PbMoO, crystals are determined. The diagrams of the splitting of the vibrational levels by thc Davydov resonance and by the factor group interactions have been determined. It is shown that the lattice radiation of crystals which have a number of vibrational oscillators (MOO,, PbMoO,) begins at low energy vibrational modes and at low values of the damping parameters.

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Single-crystal reflection and Raman spec
Single-crystal reflection and Raman spectra of the polydiacetylene THD
โœ M.E. Morrow; K.M. White; C.J. Eckhardt; D.J. Sandman ๐Ÿ“‚ Article ๐Ÿ“… 1987 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 572 KB

The 298 K Raman and reflection spectra of the polydiacetylene THD, a close structural variant of DCHD, are presented. The polymer double-and triple-bond stretch frequencies are 1485 and 21 I 1 cm-', respectively, and the lowest electronic transition peaks at 17600 cm-'. The reflection spectrum is mo