Mechanism Activating the 21Ag State in all-trans-β-Carotene Crystal to Resonance Raman Scattering
Authors:
- 1 July 1997
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 36 (7B) , L916
Abstract
The mechanism governing the additional excitation peak of the C=C stretching Raman line was studied by comparing randomly oriented crystals of all- trans-β-carotene at 11 K with microcrystals dispersed in a KBr disk at 11 K, a spin-coated film at 11 K and an isopentane solution at 160 K. Only the randomly oriented crystals gave rise to the additional peak. The peak at 14500 cm-1 is assigned to the electronic forbidden transition to the 21A g state, and its oscillator strength is estimated as f a∼1×10-2. An asymmetric distortion in the crystal is proposed to activate the forbidden transition at low temperature.Keywords
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