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首页> 美国卫生研究院文献>Molecules >Femtosecond Laser Spectroscopy of the Rhodopsin Photochromic Reaction: A Concept for Ultrafast Optical Molecular Switch Creation (Ultrafast Reversible Photoreaction of Rhodopsin)
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Femtosecond Laser Spectroscopy of the Rhodopsin Photochromic Reaction: A Concept for Ultrafast Optical Molecular Switch Creation (Ultrafast Reversible Photoreaction of Rhodopsin)

机译：飞秒视紫红质光致变色反应的激光光谱：超快速光学分子开关创建的概念（视紫红质的超快可逆光反应）

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摘要

Ultrafast reverse photoreaction of visual pigment rhodopsin in the femtosecond time range at room temperature is demonstrated. Femtosecond two-pump probe experiments with a time resolution of 25 fs have been performed. The first pump pulse at 500 nm initiated cis-trans photoisomerization of rhodopsin chromophore, 11-cis retinal, which resulted in the formation of the primary ground-state photoproduct within a mere 200 fs. The second pump pulse at 620 nm with a varying delay of 200 to 3750 fs relative to the first pump pulse, initiated the reverse phototransition of the primary photoproduct to rhodopsin. The results of this photoconversion have been observed on the differential spectra obtained after the action of two pump pulses at a time delay of 100 ps. It was found that optical density decreased at 560 nm in the spectral region of bathorhodopsin absorption and increased at 480 nm, where rhodopsin absorbs. Rhodopsin photoswitching efficiency shows oscillations as a function of the time delay between two pump pulses. The quantum yield of reverse photoreaction initiated by the second pump pulse falls within the range 15% ± 1%. The molecular mechanism of the ultrafast reversible photoreaction of visual pigment rhodopsin may be used as a concept for the development of an ultrafast optical molecular switch.
机译：证明了在室温下飞秒时间内视觉色素视紫红质的超快反向光反应。飞秒两泵探测实验的时间分辨率为25 fs。在500 nm处的第一个泵浦脉冲启动了视紫红质生色团11-顺式视网膜的顺反异构化，这导致在200 fs内形成了基本的基态光产物。相对于第一泵浦脉冲而言，第二泵浦脉冲在620 nm处具有200至3750 fs的变化延迟，从而引发了初级光产物向视紫红质的反向光转变。在两个泵浦脉冲以100 ps的时间延迟作用后获得的微分光谱上观察到了这种光转换的结果。发现在视紫红质吸收的光谱区域中在560nm处光密度降低，而在视紫红质吸收的480nm处光密度增加。视紫红质的光开关效率显示出振荡是两个泵浦脉冲之间时间延迟的函数。由第二泵浦脉冲引发的反向光反应的量子产率在15％±1％的范围内。视觉色素视紫红质的超快可逆光反应的分子机制可以用作开发超快光学分子开关的概念。

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