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Raman time-resolved

Once the transient species has been formed, it has to be monitored by some form of kinetic spectroscopy, typically with ultraviolet-visible absorption or emission, infrared (time-resolved infrared or TRIR) (74), or resonance Raman (time-resolved resonance Raman or TR3) (80) methods of detection. The transient is usually tracked by a probe beam at a single characteristic frequency, thereby giving direct access to the kinetic dimension. Spectra can then be built up point by point, if necessary, with an appropriate change of probe frequency for each point, although improvements in the sensitivity of multichannel detectors may be expected to lead increasingly to the replacement of the laborious point-by-point method by full two-dimensional methods of spectroscopic assay (that is, with both spectral and kinetic dimensions). [Pg.137]

Rossenaar BD, Stufkens DJ, Vlcek A Jr (1996) Halide-dependent change of the lowest-excited-state character from MLCT to XLCT for the complexes Re(X)(CO)3(alpha-diimine) (X = Cl, Br, I alpha-diimine equals bpy, iPr-PyCa, iPr-DAB) studied by resonance Raman, time-resolved absorption, and emission spectroscopy. Inorg Chem 35 2902-2909... [Pg.145]

The Fe-N mode is at 222 in the R state and 207 cnY in the T state for the a subunits, but only shifted to 218 T state for the (3 subunits. This is consistent with the interpretation that the Fe-imidazole interations are weakened more in the T state of the a subunits than p subunits. Time-resolved resonance Raman studies have shown that the R T switch is complete on a 10 ps tuuescale [38]. Finally, UV excitation of the aromatic protein side chains yields... [Pg.1172]

Time-resolved spectroscopy has become an important field from x-rays to the far-IR. Both IR and Raman spectroscopies have been adapted to time-resolved studies. There have been a large number of studies using time-resolved Raman [39], time-resolved resonance Raman [7] and higher order two-dimensional Raman spectroscopy (which can provide coupling infonuation analogous to two-dimensional NMR studies) [40]. Time-resolved IR has probed neutrals and ions in solution [41, 42], gas phase kmetics [42] and vibrational dynamics of molecules chemisorbed and physisorbed to surfaces [44]- Since vibrational frequencies are very sensitive to the chemical enviromnent, pump-probe studies with IR probe pulses allow stmctiiral changes to... [Pg.1172]

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]

Shreve A P and Mathies R A 1995 Thermal effects in resonance Raman-scattering—analysis of the Raman intensities of rhodopsin and of the time-resolved Raman-scattering of bacteriorhodopsin J. Phys. Chem. 99 7285-99... [Pg.1176]

J) TIME RESOLVED COHERENT RAMAN SCATTERING (TRCRS)... [Pg.1210]

With the advent of short pulsed lasers, investigators were able to perfonn time resolved coherent Raman scattering. In contrast to using femtosecond pulses whose spectral widtii provides the two colours needed to produce Raman coherences, discussed above, here we consider pulses having two distinct centre frequencies whose difference drives the coherence. Since the 1970s, picosecond lasers have been employed for this purpose [113. 114], and since the late 1980s femtosecond pulses have also been used [115]. Flere we shall briefly focus on the two-colour femtosecond pulsed experiments since they and the picosecond experiments are very similar in concept. [Pg.1210]

A version of this material appears in a speoial issue of the Journal of Physical Chemistry ded cated to the Prooeedings of the International Conferenoe on Time-Resolved Vibrational Speotrosoopy (TRVS IX), May 16-22 1999, Tuoson, Arizona. See Kirkwood J C, Ulness D J and Albreoht A C 2000 On the olassifioation of the eleotrio field speotrosoopies applioations to Raman soattering J. Phys. Chem. A 104 4167-73. [Pg.1221]

Tripathi G N R and Schuler R H 1982 Time-resolved resonance Raman scattering of transient radicals the p-aminophenoxyl radical J. Chem. Phys. 76 4289-90... [Pg.1227]

Stimson M J, Ulness D J and Albrecht A C 1996 Frequency and time resolved coherent Raman... [Pg.1229]

Okamoto H and Yoshihara K 1990 Femtosecond time-resolved coherent Raman scattering under various polarization and resonance conditions J. Opt. Soc. B7 1702-8... [Pg.1230]

Joe T, Dugan M A and Albrecht A C 1991 Time resolved coherent Stokes Raman spectroscopy (CSRS) of benzene Chem. Phys. Lett. 177 4-10... [Pg.1230]

Joe T and Albrecht A C 1993 Femtosecond time-resolved coherent anti-Stokes Raman spectroscopy of liquid benzene a Kubo relaxation function analysis J. Chem. Phys. 99 3244-51... [Pg.1230]

Okamoto H and Yoshihara K 1991 Femtosecond time-resolved coherent Raman scattering from p-carotene in solution. Ultrahigh frequency (11 THz) beating phenomenon and sub-picosecond vibrational relaxation Chem. Phys. Lett. 177 568-71... [Pg.1230]

Chronister E L and Crowell R A 1991 Time-resolved coherent Raman spectroscopy of low-temperature molecular solids in a high-pressure diamond anvil cell Chem. Phys. Lett. 182 27... [Pg.1965]

Zhu L, Wang W, Sage J T and Champion P M 1995 Femtosecond time-resolved vibrational spectroscopy of heme proteins J. Raman Spectrosc. 26 527-34... [Pg.1998]

Figure C3.1.1. The basic elements of a time-resolved spectral measurement. A pump source perturbs tlie sample and initiates changes to be studied. Lasers, capacitive-discharge Joule heaters and rapid reagent mixers are some examples of pump sources. The probe and detector monitor spectroscopic changes associated with absorjDtion, fluorescence, Raman scattering or any otlier spectral approach tliat can distinguish the initial, intennediate and final... Figure C3.1.1. The basic elements of a time-resolved spectral measurement. A pump source perturbs tlie sample and initiates changes to be studied. Lasers, capacitive-discharge Joule heaters and rapid reagent mixers are some examples of pump sources. The probe and detector monitor spectroscopic changes associated with absorjDtion, fluorescence, Raman scattering or any otlier spectral approach tliat can distinguish the initial, intennediate and final...
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.)... 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]

Kroon R., Baggen M., Lagendijk A. Vibrational dephasing in liquid nitrogen at high densities studied with time-resolved stimulated Raman gain spectroscopy, J. Chem. Phys. 91, 74-8 (1989). [Pg.292]

Time-domain Raman measurement of molecular submonolayers by time-resolved reflection spectroscopy. /. Phys. Chem. B, 108, 1525-1528. [Pg.114]

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

Typical Instrumentation and Methods for Doing Time-Resolved Resonance Raman (TR ) Experiments... [Pg.123]

See other pages where Raman time-resolved is mentioned: [Pg.120]    [Pg.129]    [Pg.120]    [Pg.129]    [Pg.1179]    [Pg.1186]    [Pg.1196]    [Pg.1200]    [Pg.1206]    [Pg.1211]    [Pg.2827]    [Pg.2962]    [Pg.443]    [Pg.513]    [Pg.516]    [Pg.40]    [Pg.71]    [Pg.123]    [Pg.123]   
See also in sourсe #XX -- [ Pg.49 , Pg.105 , Pg.113 , Pg.130 , Pg.135 , Pg.358 ]



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