Resonance Raman studies in Cu/sub 2/O. II. The yellow and green excitonic series

Journal Article · Mon May 15 04:00:00 EDT 1978 · Phys. Rev., B; (United States)

DOI:https://doi.org/10.1103/PhysRevB.17.4017· OSTI ID:7096380

Yu, P Y; Shen, Y R

Resonant Raman scattering of multiphonon modes have been studied in Cu/sub 2/O in the region of its yellow and green excitonic series. Resonant enhancements of a large number of Raman modes have been observed. The experimental results have been interpreted quantitatively in terms of three kinds of exciton-phonon scattering processes: (i) intro-yellow-exciton scattering: depending on the energy of the yellow exciton, the phonons involved are the infrared active GAMMA/sup -//sub 1/5 (660 cm/sup -/1) or the GAMMA/sup -//sub 1/2 (109 cm/sup -/1) and GAMMA/sup -//sub 1/5 (154 cm/sup -/1) modes; (ii) interexciton scattering between the 2P green exciton state and yellow exciton continuum: the phonon responsible for this scattering process is the high-energy GAMMA/sup -//sub 1/5 mode; and (iii) intra-green-exciton scattering: only the low-energy GAMMA/sup -//sub 1/5 mode is involved. From these results a detailed picture of the relaxation mechanisms of the yellow and green excitons in Cu/sub 2/O by emission of phonons is obtained.

• Research Organization: IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598
• OSTI ID: 7096380
• Journal Information: Phys. Rev., B; (United States), Journal Name: Phys. Rev., B; (United States) Vol. 17:10; ISSN PLRBA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DIPOLES
ELECTRIC DIPOLES
EXCITONS
INFRARED SPECTRA
MULTIPOLES
OXIDES
OXYGEN COMPOUNDS
PHONONS
QUASI PARTICLES
RAMAN SPECTRA
SPECTRA
TRANSITION ELEMENT COMPOUNDS