Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Time resolved

Scherer N F, Carlson R J, Matro A, Du M, Ruggiero A J, Romero-Rochin V, Cina J A, Fleming G R and Rice S A 1991 Fluorescence-detected wave packet interferometry time resolved molecular spectroscopy with sequences of femtosecond phase-locked pulses J. Chem. Rhys. 95 1487... [Pg.279]

Meyer S and Engel V 2000 Femtosecond time-resolved CARS and DFWM spectroscopy on gas-phase I, a ... [Pg.280]

Petek H and Ogawa S 1997 Femtosecond time-resolved two-photon photoemission studies of electron dynamics in metals Prog. Surf. Sc/. 56 239... [Pg.320]

Prybyla J A, Tom H W K and Aumiller G D 1992 Femtosecond time-resolved surface reaction desorption of Co from Cu(111) in <325. fsec Phys. Rev. Lett. 68 503... [Pg.320]

Most ion-molecule techniques study reactivity at pressures below 1000 Pa however, several techniques now exist for studying reactions above this pressure range. These include time-resolved, atmospheric-pressure, mass spectrometry optical spectroscopy in a pulsed discharge ion-mobility spectrometry [108] and the turbulent flow reactor [109]. [Pg.813]

In order to probe the importance of van der Waals interactions between reactants and solvent, experiments in the gas-liqnid transition range appear to be mandatory. Time-resolved studies of the density dependence of the cage and clnster dynamics in halogen photodissociation are needed to extend earlier quantum yield studies which clearly demonstrated the importance of van der Waals clnstering at moderate gas densities [37, 111]... [Pg.861]

The above discussion represents a necessarily brief simnnary of the aspects of chemical reaction dynamics. The theoretical focus of tliis field is concerned with the development of accurate potential energy surfaces and the calculation of scattering dynamics on these surfaces. Experimentally, much effort has been devoted to developing complementary asymptotic techniques for product characterization and frequency- and time-resolved teclmiques to study transition-state spectroscopy and dynamics. It is instructive to see what can be accomplished with all of these capabilities. Of all the benclunark reactions mentioned in section A3.7.2. the reaction F + H2 —> HE + H represents the best example of how theory and experiment can converge to yield a fairly complete picture of the dynamics of a chemical reaction. Thus, the remainder of this chapter focuses on this reaction as a case study in reaction dynamics. [Pg.875]

Apparent non-RRKM dynamics has also been observed in time-resolved femtosecond (fs) experiments in a collision-free enviromnent [117], An experimental study of acetone illustrates this work. Acetone is dissociated to the CH and CH CO (acetyl) radicals by a fs laser pulse. The latter which dissociates by the channel... [Pg.1037]

Ionov S I, Brucker G A, Jaques C, Chen Y and Wittig C 1993 Probing the NO2 —>NO+0 transition state via time resolved unimolecular decomposition J. Chem. Phys. 99 3420-35... [Pg.1040]

Barnes R J, Dutton G and Sinha A 1997 Unimolecular dissociation of HOCI near threshold quantum state and time-resolved studies J. Phys. Cham. A 101 8374-7... [Pg.1042]

Within physical chemistry, the long-lasting interest in IR spectroscopy lies in structural and dynamical characterization. Fligh resolution vibration-rotation spectroscopy in the gas phase reveals bond lengths, bond angles, molecular symmetry and force constants. Time-resolved IR spectroscopy characterizes reaction kinetics, vibrational lifetimes and relaxation processes. [Pg.1150]

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]

Pibel C D, Sirota E, Brenner J and Dai H L 1998 Nanosecond time-resolved FTIR emission spectroscopy monitoring the energy distribution of highly vibrationally excited molecules during collisional deactivation J. Chem. Phys. 108 1297-300... [Pg.1176]

Leone S R 1989 Time-resolved FTIR emission studies of molecular photofragmentation Accounts Chem. Res. 22 139-44... [Pg.1176]

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]

Cavanagh R R, Fleilweil E J and Stephenson J C 1994 Time-resolved measurements of energy-transfer at surfaces Surf. Sc/. 300 643-55... [Pg.1177]

Crippa P R, Vecii A and Viappiani C 1994 Time-resolved photoacoustic-spectroscopy—new developments of an old idea J. Photochem. Photobiol. B-Biol. 24 3-15... [Pg.1177]

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]

L) HIGHER ORDER AND HIGHER DIMENSIONAL TIME RESOLVED TECHNIQUES... [Pg.1211]

Plenary 4. George J Thomas Jr et at, e-mail address thomasgj ,cctr.mnkc.edu (RS). Protein folding and assembly into superstructures. (Slow) time resolved RS probing of virus construction via protein assembly into an icosahedral (capsid) shell. [Pg.1217]

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]

Toleutaev B N, Tahara T and Hamaguchi H 1994 Broadband (1000 cm multiplex CARS spectroscopy application to polarization sensitive and time-resolved measurements Appl. Phys. 59 369-75... [Pg.1226]

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]

Morita N and Yajima T 1984 Ultrafast-time-resolved coherent transient spectroscopy with incoherent light Rhys. Rev. A 30 2525-36... [Pg.1229]

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]

Ruhman S, Joly A G and Nelson K A 1987 Time-resolved observations of coherent molecular vibrational motion and the general occurrence of impulsive stimulated scattering J. Chem. Phys. 86 6563-5... [Pg.1230]

See other pages where Time resolved is mentioned: [Pg.312]    [Pg.847]    [Pg.861]    [Pg.1090]    [Pg.1165]    [Pg.1172]    [Pg.1177]    [Pg.1179]    [Pg.1186]    [Pg.1196]    [Pg.1200]    [Pg.1206]    [Pg.1211]   
See also in sourсe #XX -- [ Pg.376 ]

See also in sourсe #XX -- [ Pg.131 , Pg.132 , Pg.200 , Pg.202 , Pg.203 ]

See also in sourсe #XX -- [ Pg.146 , Pg.147 , Pg.269 , Pg.278 , Pg.358 ]

See also in sourсe #XX -- [ Pg.131 , Pg.132 , Pg.200 , Pg.202 , Pg.203 ]

See also in sourсe #XX -- [ Pg.49 , Pg.113 , Pg.130 , Pg.135 , Pg.358 ]

See also in sourсe #XX -- [ Pg.3 , Pg.9 , Pg.103 , Pg.209 , Pg.242 , Pg.249 , Pg.258 , Pg.259 , Pg.278 , Pg.314 , Pg.326 , Pg.334 , Pg.335 , Pg.337 , Pg.339 , Pg.344 , Pg.371 , Pg.408 , Pg.412 , Pg.414 , Pg.418 , Pg.423 , Pg.462 , Pg.467 ]

See also in sourсe #XX -- [ Pg.94 ]

See also in sourсe #XX -- [ Pg.74 , Pg.108 , Pg.109 ]

See also in sourсe #XX -- [ Pg.206 ]

See also in sourсe #XX -- [ Pg.60 , Pg.61 , Pg.68 , Pg.69 ]



SEARCH



© 2024 chempedia.info