Raman spectroscopy, time-resolved resonance

Time-resolved Raman spectroscopy is a powerful tool for studying the structure and dynamics of transient species. Raman spectra have been briefly described in Chapter 4. Resonance Raman (RR) is different from the original Raman only by [Pg.333]

An important example is resonance with a nn transition. As we will see in Section 12.5, the bond distance changes much in jtjt transitions. In particular, the stretching modes are now enhanced in the RR spectrum. The excited vibronic state is quantized together with vibrations that are typical for the excited state but slightly different from those of the ground state. The equation [Pg.334]

In a biosystem, such as a photosynthetic reaaion center, electron transfer leads to stretching of some bonds and shortening of others. The vibrations of these bonds are seen in the RR spectrum and are helpful in identifying the mechanism of pho- [Pg.334]

What is seen in the RR spectrum is automatically time-resolved in the same way as the excitation pulse. It is thus possible to study what happens to a vibration on a very short timescale and this bears witness to which bond is broken. [Pg.334]

Bell S E J 1996 Time-resolved resonance Raman spectroscopy A/ a/ysf 121 R107-20... [Pg.1175]

Kincaid J R 1995 Structure and dynamics of transient species using time-resolved resonance Raman-spectroscopy Biochemical Spectroscopy Methods Enzymol. vol 246, ed K Sauer (San Diego, CA Academic) pp 460-501... [Pg.1175]

Qin L, Tripathi G N R and Schuler R H 1987 Radiolytic oxidation of 1,2,4-benzenetriol an application of time-resolved resonance Raman spectroscopy to kinetic studies of reaction intermediates J. Chem. Phys. [Pg.1227]

Figure C3.1.11. Apparatus for pump-probe time-resolved resonance Raman spectroscopy. (From Varotsis C and Babcock G T 1993 K4ethods Enzymol. 226 409-31.)...

Friedman J M 1994 Time-resolved resonance Raman spectroscopy as probe of structure, dynamics, and reactivity in hemoglobin Methods Enzymol. 232 205-31... [Pg.2970]

An Introduction to Time-Resolved Resonance Raman Spectroscopy and Its Application to Reactive Intermediates... [Pg.123]

AN INTRODUCTION TO TIME-RESOLVED RESONANCE RAMAN SPECTROSCOPY... [Pg.124]

Hydrogen Abstraction Photoexcited ketone intermolecular hydrogen atom abstraction reactions are an interesting area of research becanse of their importance in organic chemistry and dne to the complex reaction mechanisms that may be possible for these kinds of reactions. Time resolved absorption spectroscopy has typically been nsed to follow the kinetics of these reactions but these experiments do not reveal mnch abont the strnctnre of the reactive intermediates. " Time resolved resonance Raman spectroscopy can be used to examine the structure and properties of the reactive intermediates associated with these reactions. Here, we will briefly describe TR experiments reported by Balakrishnan and Umapathy to study hydrogen atom abstraction reactions in the fluoranil/isopropanol system as an example. [Pg.151]

The historical development and elementary operating principles of lasers are briefly summarized. An overview of the characteristics and capabilities of various lasers is provided. Selected applications of lasers to spectroscopic and dynamical problems in chemistry, as well as the role of lasers as effectors of chemical reactivity, are discussed. Studies from these laboratories concerning time-resolved resonance Raman spectroscopy of electronically excited states of metal polypyridine complexes are presented, exemplifying applications of modern laser techniques to problems in inorganic chemistry. [Pg.454]

Time-resolved resonance Raman spectroscopy has been used to study the photorearrangement of o-nitrobenzyl esters in polar and protic solvents53 in acetonitrile, the only primary photoproduct is nitronic acid 68 with a lifetime of 80 microsecond, while in methanol the nitronic acid exists in equilibrium with the nitronate anion 69, giving a lifetime of 100 microseconds (equation 41). [Pg.767]

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