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By M.D. Fayer
Describes the cutting-edge for probing bond activation, H-bonded platforms, molecular dynamical mechanisms, and different components of ultrafast and infrared and raman spectroscopy. Evaluates new systems within the research and use of lattice vibrations, and different state-of-the-art components.
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Extra resources for Ultrafast Infrared and Raman Spectroscopy
Sample text
6a and b, the peak level of the nonresonant scattering is fully consistent with the prediction of Equation (8). 01. 003 (44) from Raman spectroscopy and strongly supports our interpretation of the data of Fig. 6b. The values of T2 and an are consistent with the measured linewidths of the isotropic and anisotropic Raman bands. Similar results for two other liquids are listed in Table 1. 2. , the non-Markovian behavior of vibrational relaxation at short times (45,46). The analysis of experimental data close to the maximum of the signal transient is, however, made difficult by the additional factors discussed above that obscure the resonant-isotropic scattering around tD D 0.
The IR pump pulse with a spectral width notably smaller than the total band resonantly interacts only with a fraction of the OH groups. In this way a subensemble is Copyright © 2001 by Taylor & Francis Group, LLC selected according to its frequency position and promoted from the ground state to an excited vibrational level. A situation is depicted where the structural components located at the peak of the OH band are predominantly excited. The corresponding energy level scheme is shown on the righthand side of Fig.
Frequency setting using computer-controlled stepping motors requires a fraction of a second. This makes the setup a real spectrometer for timeresolved investigations. Working in the short-pulse regime, for example, excitation and probing pulses of ½450 fs duration and spectral width Ä35 cm 1 are generated in the range 1600–3700 cm 1 (12). The pulse energy amounts to Ä10 µJ (pump) and ³10 nJ (probe). For long-pulse conditions, on the other hand, pump (probe) pulses of 2 ps (1 ps) of spectral width 8 cm 1 16 cm 1 are available, providing superior spectral resolution.