David A. Blank

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The dynamics of a series of 1-acylaminoanthraquinones with varying degrees of excited-state intramolecular proton transfer are studied in acetonitrile and dichloromethane. Events are followed via changes in the third-order intermolecular Raman response as a function of time after resonant excitation of the chromophore. Compared to electronically resonant(More)
Excited state intramolecular proton transfer in 1-chloroacetylaminoanthraquinone is investigated from the perspective of the solvent. Using a new two-dimensional nonlinear optical spectroscopy the solvent response is probed directly as the proton transfer takes place. The measurements indicate that solvent reorganization controls the proton transfer in(More)
Photophysical data for a series of end substitued 3',4'-dibutyl-2,2':5',2''-terthiophenes are reported. Static absorption and fluorescence, quantum yields, time-resolved fluorescence, and time- and frequency-resolved pump-probe spectra are applied to investigate excited state relaxation in bromo, nitro, and tricyanovinyl substituted species in a variety of(More)
The creation of caged molecules involves the attachment of protecting groups to biologically active compounds such as ligands, substrates and drugs that can be removed under specific conditions. Photoremovable caging groups are the most common due to their ability to be removed with high spatial and temporal resolution. Here, the synthesis and(More)
We have demonstrated that fifth-order stimulated Raman spectra of the intermolecular modes in CS 2 are dominated by cascading third-order processes. Previous studies have successfully discriminated against a sequential cascading process, but did not account for parallel third-order cascades. All of our measured spectra were successfully simulated(More)
The cascading polarization contributing to the femtosecond fifth-and seventh-order coherent Raman scattering processes is obtained in terms of the third-and fifth-order Raman response functions. It is found that four cascading processes contribute to the fifth-order Raman scattering signal. In the case of the seventh-order Raman scattering, there are 34(More)
Ž. w Ž. x We use a quasiempirical valence bond QVB scheme E.A. Carter, Chem. Phys. Lett. 169 1990 218 for calculating the heats of formation of adsorbed species on surfaces to provide reliable estimates of the relative stabilities of several of the surface intermediates and adsorbate-surface bond strengths that are important in the selective dehydrogenation(More)
In this paper we report the measurement of the direct fifth-order electronically nonresonant intermolecular response from liquid CS 2 at room temperature. We recently demonstrated that all previous attempts to measure the direct fifth-order response were dominated by third-order cascaded signals ͓J. Chem Phys. 111, 3105 ͑1999͔͒. Here we show that phase(More)
The time dependent change in the intermolecular response of solvent molecules following photoexcitation of Coumarin 102 (C102) has been measured in acetonitrile-water binary mixtures. Experiments were performed on mixtures of composition x(CH3CN) = 0.25, 0.50, 0.75, and 1.00. At low water concentrations (x(H2O) < or = 0.25) the solvent response is(More)
This paper presents several experimentally collected tensor elements of the direct fifth-order Raman signal of room temperature CS 2. All results were collected so as to reduce contamination from third-order cascade signals, and it is shown that while these cascade signals are of varying importance in different tensor elements, phase matching considerations(More)