Observation of the interference between the intramolecular IR-visible and visible-IR processes in the doubly resonant sum frequency generation vibrational spectroscopy of Rhodamine 6G adsorbed at the air/water interface.
Observation of the interference between the intramolecular IR-visible and visible-IR processes in the doubly resonant sum frequency generation vibrational spectroscopy of Rhodamine 6G adsorbed at the air/water interface.
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DOI：
10.1021/jp901655j
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发表时间：
2009-05
期刊：
影响因子：
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通讯作者：
Dan Wu;Gang-Hua Deng;Yuan Guo;Hong-fei Wang
中科院分区：
文献类型：
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作者：
Dan Wu;Gang-Hua Deng;Yuan Guo;Hong-fei Wang
利用532.1 nm的皮秒可见光和2800-3100 cm(-1)的红外光，在空气/水界面吸附的罗丹明6G的双共振和频发生振动光谱中观察到分子内红外-可见光和可见-红外过程之间的干扰。 2800～3100 cm(-1)区域的C-H伸缩振动和1450～1700 cm(-1)区域的骨架振动均存在干涉现象。不同波长下可见光-红外过程的相对强度是分子电子结构的结果。这是对模型分子系统电子激发态下可见光-红外和频生成过程的首次直接观察。
Using the picosecond visible light at 532.1 nm and infrared light at 2800-3100 cm(-1), we observed the interference between the intramolecular IR-visible and visible-IR processes in the doubly resonant sum frequency generation vibrational spectroscopy of Rhodamine 6G adsorbed at the air/water interface. The interference phenomenon exists for both the C-H stretching vibrations in the 2800-3100 cm(-1) region and the skeleton vibrations in the 1450-1700 cm(-1) region. The relative strength of the visible-IR process at different wavelengths is the result of the electronic structure of the molecule. This is the first direct observation of the visible-IR sum frequency generation process in the electronically excited state of a model molecular system.