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Dynamics and structural information of hydrogen-bonded systems investigated by picosecond infrared spectroscopy

机译：皮秒红外光谱研究氢键体系的动力学和结构信息

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Abstract: Using infrared double-resonance spectroscopy on the time-scale of picoseconds the ultrafast dynamics of hydrogen bonds in condensed matter is directly investigated for the first time. We have developed a two-color pump-probe technique with independently tunable intense pump (approximately 10$+10$/ W/cm$+2$/) and weak probing pulses. Within the tuning range of 1.4 - 4 $mu@m novel spectroscopic information is obtained by the help of temporal (approximately 3 ps), spectral (approximately 5 cm$+$MIN@1$/) and polarization resolution. New spectral features not accessible for conventional IR spectroscopy are observed, e.g. excited state absorption, induced hot bands and, most important, spectral holes. In this way photophysical (vibrational energy transfer) and IR-photochemical processes are investigated. Structural information is derived from the separation of inhomogeneous and homogeneous broadening effects of the infrared bands.!6
机译：摘要：在皮秒的时间尺度上使用红外双共振光谱法，首次直接研究了凝聚态氢键的超快动力学。我们开发了一种双色泵浦探测技术，具有独立可调的强泵浦（大约10 $ + 10 $ / W / cm $ + 2 $ /）和弱探测脉冲。在1.4-4μm的调谐范围内，借助时间（约3 ps），光谱（约5 cm $ + $ MIN @ 1 $ /）和偏振分辨率获得了新颖的光谱信息。观察到常规红外光谱无法获得的新光谱特征，例如激发态吸收，感应热带以及最重要的是光谱空穴。以这种方式研究了光物理（振动能量转移）和红外光化学过程。结构信息来自于红外波段不均匀和均匀加宽效应的分离。6

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