Raman scattering from defects in GaN: The question of vibrational or electronic scattering mechanism

1998 ◽  
Vol 58 (20) ◽  
pp. 13619-13626 ◽  
Author(s):  
H. Siegle ◽  
A. Kaschner ◽  
A. Hoffmann ◽  
I. Broser ◽  
C. Thomsen ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Scattering Mechanism ◽  
Electronic Scattering

Doubly resonant first order Raman scattering in narrow quantum wells: Scattering mechanism and resonance profile

1991 ◽  
Vol 10 (3) ◽  
pp. 389-394 ◽  
Author(s):  
D. Schwarze ◽  
H. Stolz ◽  
W. von der Osten ◽  
G. Weimann ◽  
J. Röseler ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Quantum Wells ◽  
Scattering Mechanism ◽  
First Order

Studies of nonlinear phenomena - I. Theory of the hyper Raman effect

1970 ◽  
Vol 318 (1535) ◽  
pp. 441-457 ◽  
Keyword(s):  
Raman Scattering ◽  
Density Matrix ◽  
Scattered Radiation ◽  
Raman Effect ◽  
Theoretical Treatment ◽  
Nonlinear Phenomena ◽  
Scattering Mechanism

A detailed theoretical treatment of the hyper Raman effect is presented. Using the density matrix treatment we derive general formulae which give information on the frequencies of the scattered radiation, the scattering mechanism and resonance processes. A hyperpolarizability theory analogous to the Placzek polarizability theory is developed and the conditions under which it is valid are established. The enhancement of intensity of hyper Raman scattering through resonance processes is discussed.

Raman Spectrum of TlCl0.6Br0.4 near Resonance

1973 ◽  
Vol 51 (15) ◽  
pp. 1657-1663 ◽  
Author(s):  
N. Krishnamurthy ◽  
B. H. Torrie
Keyword(s):  
Raman Spectrum ◽  
Raman Scattering ◽  
Single Crystals ◽  
Mixed Crystal ◽  
Resonant Scattering ◽  
Excitation Wavelength ◽  
Scattering Mechanism ◽  
Near Resonance ◽  
Exciting Wavelength ◽  
Densities Of States

Raman scattering from single crystals of TlCl0.6Br0.4 has been observed both as a function of temperature and excitation wavelength. The spectra exhibit strong one-phonon Raman scattering at 17 and 37 cm−1 and a weak two-phonon band centered at 296 cm−1, close to twice the LO frequency (q = 0) of the mixed crystal. From the temperature dependence and the calculated one- and two-phonon densities of states, it is shown that the 37 cm−1 line and the tail following it are an admixture of first- and second-order Raman scattering. The enhancement of the intensity of the 296 cm−1 band when the exciting wavelength is decreased from 5145 Å to 4545 Å is attributed to the resonant-scattering mechanism proposed by Fontana and Mulazzi.

RESONANT PROPERTIES OF INELASTIC LIGHT SCATTERING IN Bi2Sr2CaCu2O8-x SUPERCONDUCTING SINGLE CRYSTALS

1992 ◽  
Vol 06 (18) ◽  
pp. 1137-1143 ◽  
Author(s):  
O. V. MISOCHKO ◽  
A. KH. ARSLANBEKOV
Keyword(s):  
Light Scattering ◽  
Raman Scattering ◽  
Single Crystals ◽  
Inelastic Light Scattering ◽  
Similar Character ◽  
Electronic Scattering

The resonant properties of Raman scattering in Bi 2 Sr 2 CaCu 2 O 8-x single crystals for four diagonal phonons and electronic scattering as well have been investigated for different polarizations. The resonance profiles for the phonons were of similar character, but the resonant profiles of the two components of electronic scattering, by contrast, were different.

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