Femtosecond time-resolved

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]

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 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]

Shank C V, Yen R and Hirlimann C 1983 Femtosecond-time-resolved surface structural dynamics of optically excited silicon Phys. Rev. Lett. 51 900-2... [Pg.1304]

Hohifeld J, Conrad U, Muller Wellershoff S S and Matthias E 1998 Femtosecond time-resolved linear and second-order reflectivity of metals Nonlinear Optics in Metals ed K H Bennemann (Oxford Clarendon) pp 219-67... [Pg.1304]

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]

Diller R, Malt S, Walker G 0, Cowen B R, Pippenger R, Bogomoini R A and Hochstrasser R M 1995 Femtosecond time-resolved infrared laser study of the J-K transition of bacteriorhodopsin Chem. Rhys. Lett. 241 109-15... [Pg.1999]

Althorpe S C and Seideman T 1999 Molecular alignment from femtosecond time-resolved photoelectron angular distributions nonperturbative calculations on NO J. Chem. Phys. 110 147... [Pg.2331]

C. Rischel, A. Rousse, 1. Uschmann, P. A. Albouy, J.-P. Geindre, P. Audebert, J.-C. Gauthier, E. Froster, J.-L. Martin, and A. Antonetti, Femtosecond time-resolved X-ray diffraction from laser-heated organic films. Nature 390, 490 92 (1997). [Pg.284]

A qualitatively different approach to probing multiple pathways is to interrogate the reaction intermediates directly, while they are following different pathways on the PES, using femtosecond time-resolved pump-probe spectroscopy [19]. In this case, the pump laser initiates the reaction, while the probe laser measures absorption, excites fluorescence, induces ionization, or creates some other observable that selectively probes each reaction pathway. For example, the ion states produced upon photoionization of a neutral species depend on the Franck-Condon overlap between the nuclear configuration of the neutral and the various ion states available. Photoelectron spectroscopy is a sensitive probe of the structural differences between neutrals and cations. If the structure and energetics of the ion states are well determined and sufficiently diverse in... [Pg.223]

Structure, then the time-resolved photoelectron spectra [20, 21] could reveal signatures of two different intermediate structures, representing two different pathways on the PES. Transient absorption spectroscopy and other femtosecond time-resolved techniques may also be applicable to this problem. [Pg.224]

As discussed in Section II.A, Eisenthal and coworkers have studied the related problem of isomerization at liquid-solid interfaces. They used time-resolved second harmonic generation to investigate the barrierless photoisomerization of malachite green at the silica-aqueous interface using femtosecond time-resolved second harmonic generation [26]. They found that the photoisomerization reaction proceeded but was an order of magnitude slower at the water-silica interface than in bulk solution. [Pg.415]

Employing all of the TR results in conjunction with results from femtosecond time-resolved transient absorption (fs-TA) and femtosecond time-resolved Kerr gated fluorescence (fs-KTRF) experiments enables a reaction mechanism to be developed... [Pg.166]

Finally a few sentences are deserved for the vast area of DNA photochemistry. Thymine dimerization is the most common photochemical reaction with the quantum yield of formation in isolated DNA of all-thymine oligodeoxynucleotides 2-3% [3], Furthermore, a recent study based on femtosecond time-resolved transient absorption spectroscopy showed that thymine dimers are formed in less than 1 ps when the strand has an appropriate conformation [258], The low quantum yield of the reaction in regular DNA is suggested to be due to the infrequency of these appropriate reactive conformations. [Pg.326]

Strand cleavage studies have provided relative rate constants for hole transport versus the rate constant for the initial chemical event leading to strand cleavage [18-20]. However, they do not provide absolute rate constants for hole transport processes. Several years ago we introduced a method based on femtosecond time-resolved transient-absorption spectroscopy for investigating the dynamics of charge separation and charge recombination in synthetic DNA hairpins [21, 22]. Recently, we have found that extensions of this method into the nanosecond and microsecond time domains permit investigation of the dynamics of hole transport from a primary hole... [Pg.56]

The dynamics of photoinduced charge separation, kcs, and charge recombination, kcr (Fig. 2a), have been studied in several families of hairpins containing an Sa linker and a single G C base pair by means of femtosecond time-resolved transient absorption spectroscopy [27, 28]. Both the singlet state and anion radical of Sa have strong transient absorption centered at 575 nm. The difference in the independently determined band shapes for Sa ... [Pg.58]

Figure 3. Femtosecond time-resolved spectra of RC. (Adapted from Ref. 86.)...

Figure 18. Femtosecond time-resolved spectra for Rb. sphaeroides R26 [39].

Seel, M., and Domcke, W. (1991), Femtosecond Time-resolved Ionization Spectroscopy of Ultrafast Internal-Conversion Dynamics in Polyatomic Molecules Theory and Computational Studies, J. Chem. Phys. 95,7806. [Pg.234]

C. Application 1 Femtosecond Time-Resolved Fluorescence from a... [Pg.51]

FIGURE 3.6 The CCD image of a fluorescent bead under (a) laser trapping, and (b) without laser trapping, (c) The femtosecond time-resolved fluorescence at 520 nm observed with lOOx objective lens. (Form, Fujino, T. and Tahara, T.,Appl. Phys. B 79 145-151, 2004.)... [Pg.60]

FIGURE 3.8 Femtosecond time-resolved fluorescence observed from a tetracene-doped anthracene microcrystal (excitation 400 inn fluorescence 530 nm). (From Fujino, T., Fujima, T., and Tahara, T., J. Phys. Chem. B 109 15327-15331, 2005. Used with permission.)... [Pg.63]

Rischel C, Rousse A, Uschmann I, Albouy P-A, Geindre J-P, Audebert P, Gauthier J-C, Forster E, Martin J-L, Antonetti A (1997) Femtosecond time-resolved X-ray diffraction Ifom laser-heated organic films. Nature 390 490-492... [Pg.130]

The success of femtosecond time-resolved experiments depends on having lasers able to provide sufficiently short and intense pulses, together with an effective integration of all the other instrumentation, optical components, and computers necessary for the enterprise, and on the susceptibility of starting material to photoexcitation. These requirements are readily understood. Success also depends on coherent formation of the excited system through the pump pulse, a consideration not so readily grasped. [Pg.904]

A femtosecond time-resolved study of reactions following excitation of 1,3-dibro-mopropane to a (n,5p) Rydberg state uncovered a striking instance of coherent dynamics in a relatively large molecular environment, one characterized by 27 internal degrees of freedom. ... [Pg.908]

Femtosecond time-resolved measurements formation and relaxation dynamics of the solvated electron in water... [Pg.227]

Big Chemical Encyclopedia

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