FEMTOSECOND TIME-RESOLVED COHERENT RAMAN-SCATTERING FROM BETA-CAROTENE IN SOLUTION - ULTRAHIGH FREQUENCY (11-THZ) BEATING PHENOMENON AND SUBPICOSECOND VIBRATIONAL-RELAXATION
FEMTOSECOND TIME-RESOLVED COHERENT RAMAN-SCATTERING FROM BETA-CAROTENE IN SOLUTION - ULTRAHIGH FREQUENCY (11-THZ) BEATING PHENOMENON AND SUBPICOSECOND VIBRATIONAL-RELAXATION
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DOI：
10.1016/0009-2614(91)90086-o
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发表时间：
1991-03-08
影响因子：
2.8
通讯作者：
YOSHIHARA, K
中科院分区：
文献类型：
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作者：
OKAMOTO, H;YOSHIHARA, K
观察到了全反式β-胡萝卜素在不同溶剂中的飞秒时间分辨相干反斯托克斯拉曼散射(CARS)。当泵浦和斯托克斯辐射之间的频率差被设置在两个强拉曼光谱之间时，观察到由于两个强拉曼跃迁(几乎等于1520和几乎等于1150 cm-1)之间的拍频而产生的规则振荡模式(11THz)。测量了“同相”C=C伸缩带的振动弛豫率。弛豫速率T2几乎等于-0.6ps，与溶剂无关。这一速率是由于分子内的振动弛豫所致。
Femtosecond time-resolved coherent anti-Stokes Raman scattering (CARS) has been observed for all-trans beta-carotene in various solvents. A regular oscillating pattern (11 THz) owing to the beat among the two strong Raman transitions (almost-equal-to 1520 and almost-equal-to 1150 cm-1) is observed when the frequency difference between the pump and Stokes radiation is set in-between the two strong Raman bands. The vibrational relaxation rate has been measured for the "in-phase" C = C stretching band. The relaxation rate is found to be T2 almost-equal-to 0.6 ps and independent of solvent. This rate is due to intramolecular vibrational relaxation.