Walkers

Walker, Roger G, et al. (1992) Facies Models,409p, Geological Association of Canada... 

Fig. IV 23. Penetration of cholesterol monolayers by CTAB (hexadecyl-trimethylam-monium bromide. [From D. M. Alexander, G. T. Barnes, M. A. McGregor, and K. Walker, Phenomena in Mixed Surfactant Systems, in J. F. Scamehom, ed., ACS Symposium Series 311, p. 133, 1986 (Ref. 269). Copyright 1986, American Chemical Society.]...

Brebbia C A and Walker S 1980 Boundary Element Technique in Engineering (London Newnes-Butterworth)... 

So far we have exclusively discussed time-resolved absorption spectroscopy with visible femtosecond pulses. It has become recently feasible to perfomi time-resolved spectroscopy with femtosecond IR pulses. Flochstrasser and co-workers [M, 150. 151. 152. 153. 154. 155. 156 and 157] have worked out methods to employ IR pulses to monitor chemical reactions following electronic excitation by visible pump pulses these methods were applied in work on the light-initiated charge-transfer reactions that occur in the photosynthetic reaction centre [156. 157] and on the excited-state isomerization of tlie retinal pigment in bacteriorhodopsin [155]. Walker and co-workers [158] have recently used femtosecond IR spectroscopy to study vibrational dynamics associated with intramolecular charge transfer these studies are complementary to those perfomied by Barbara and co-workers [159. 160], in which ground-state RISRS wavepackets were monitored using a dynamic-absorption technique with visible pulses. 

Jarzeba W, Walker G C, Johnson A E and Barbara P F 1991 Nonexponential solvation dynamics of simple liquids and mixtures Chem. Phys. 152 57-68... 

Walker G C, Maiti S, Cowen B R, Moser C C, Dutton P L and Hochstrasser R M 1994 Time resolution of electronic transitions of photosynthetic reaction centers in the infrared J. Phys. Chem. 

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... 

Wang 0, Akhremitchev B and Walker G 0 1997 Femtosecond infrared and visible spectroscopy of photoinduced intermolecular electron transfer dynamics and solvent-solute reaction geometries Coumarin 337 in dimethylaniline J. Rhys. Chem. A 101 2735-8... 

Walker G 0, Barbara P F, Doom S K, Dong Y and Hupp J T 1991 Ultrafast measurements on direct photoinduced electron transfer in a mixed-valence complex J. Rhys. Chem. 95 5712-15... 

Stechel E B, Walker R B and Light J C 1978 R-matrix solution of coupled equations for inelastic scattering J. Chem. Phys. 69 3518... 

Walker T, Sesko D and Wieman C 1990 Collective behavior of optically trapped neutral atoms Phys.Rev.Lett. 64 408-11... 

Wang C, Mohney B K, Williams R, Hupp J T and Walker G C 1998 Solvent control of vibronic coupling upon intervalence charge transfer excitation of (NC)gFeCNRu(NH3)g- as revealed by resonance Raman and near-infrared absorption spectroscopies J. Am. Chem. Soc. 120 5848-9... 

Barbara P F, Walker G C and Smith T P 1992 Vibrational modes and the dynamic solvent effect in electron and proton transfer Science 256 975-81... 

Snir, M., Otto, S., Huss-Lederman, S., Walker, D., Dongarra, J. MPI The Complete Reference. MIT Press, Cambridge, Massachusetts, 1995. 

Vl L, J R Walker and C R A Catlow 1984. A Molecular Dynamics Simulation Study of the iperionic Conductor Lithium Nitride I. Journal of Physical Chemistry 17 6623-34. 

In practice, it is found that this simple implementation is not the most effective approach. There are two particular problems. First, when the two simulations are run in tandem then significant correlations can arise, which results in large systematic errors. There are a number of ways to avoid these correlations, such as moving the J-walker an extra nuniher... 

W. G. Richards, T. E. H. Walker, L. Farnell, P. R. Scott, Bibliography of ah initio Molecular Wave Eunctions Supplement for 1970-1973 Oxford, Oxford (1974). 

Selective oxidation of secondary alcohols to ketones is usually performed with CrOj/HjSO, I I in acetone (Jones reagent) or with CrOjPyj (Collin s reagent) in the presence of acid-sensitive groups (H.G. Bosche, 1975 C. Djerassi, 1956 W.S. Allen, 1954). As mentioned above, a,)S-unsaturated secondary alcohols are selectively oxidized by MnOj (D.G. Lee, 1969 D. Arndt, 1975) or by DDQ (D. Walker, 1967 H.H. Stechl, 1975). 

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