RAMAN AND INFRARED SPECTRA OF TELLURIUM SUB-BROMIDE (Te//2Br).

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Title

RAMAN AND INFRARED SPECTRA OF TELLURIUM SUB-BROMIDE (Te//2Br). (EN)

Creator

Richter, W (EN)

Raptis, JS (EN)

Anastassakis, E (EN)

Type

journalArticle (EN)

Partial document
Publication in journal (EN)

Article
Scientific article (EN)

Issued

2014-03-01T01:06:28Z

1985 (EN)

Year

1985 (EN)

Description

Raman and IR spectroscopic techniques are used to study the long-wavelength optical phonons of tellurium sub-bromide (orthorhombic structure). By use of an appropriate range of temperatures and excitation wavelengths the frequencies for nearly all of the A//2 and B//2 q approximately equals 0 optical phonons are determined. Oscillator strengths and LO-frequencies for these phonons are obtained from the fitting of IR reflection spectra with a multiple oscillator model. The temperature dependence of the frequency and damping constant for some of these phonons is discussed. A remarkable features of this material is the existence of low frequency ( approximately equals 20 cm** minus **1) phonons with extremely large polarizabilities ( DELTA // chi up to 150). (EN)

Scientific field

Physics, Condensed Matter (EN)

Natural Sciences ▶ Physical sciences
Condensed Matter Physics (EN)

Subject

PHONONS (EN)

Infrared Spectra (EN)

TELLURIUM SUBBROMIDE (EN)

SPECTROSCOPY, INFRARED - Applications (EN)

OSCILLATOR STRENGTHS (EN)

LO FREQUENCIES (EN)

SPECTROSCOPY, RAMAN - Applications (EN)

TELLURIUM COMPOUNDS (EN)