Rotational Coherence Spectroscopy Applied to the Structural Analysis of Jet-Cooled Tryptophan Analogs and their Hydrogen-Bonded Complexes with Polar Solvents

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Ohio State University

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Rotational Coherence $Spectroscopy^{1}$, a time-resolved high resolution rotational spectroscopy, is performed to determine the structures of various jet-cooled tryptophan analogs and their hydrogen-bonded complexes with methanol and water. The time-resolved fluorescence depletion technique of J. D. $McDonald^{2}$ is used to do Rotational Coherence Spectroscopy(TRFD-RCS). Results from TRFD-RCS yield excited stated rotational constants of these large jet-cooled speicies. Once accurate excited state rotational constants have been obtained and results from molecular mechanics calculations evaluated, the structure of the tryptophan analogs and their complexes can be determined.


$^{1}$ (a) P.M. Felker, A. H. Zewail, J. Chem. Phys 86, 2460-2482 91987); (b) J. S. Baskin, P. M. Felker, and A. H. Zewail, J. Chem, Phys. 86, 2483-2499 (1987). $^{2}$ (a) M. J. Cote, J. F. Kauffman, P. G. Smith, and J. D. McDonald, J. Chem Phys. 90, 2865-2873 (1989); J. F. Kauffman, M. J. Cote, P. G. Smith, and J. D. McDonald. J. Chem, Phys. 90, 2874-2891 (1989)
Author Institution: Department of Chemistry and Biochemistry, University of California