NDLI: Interaction of Electrons with Indole, Tryptophan, and their Derivatives in the Gas Phase

Content Provider	Springer Nature Link
Author	Borisevich, N. A. Ivav, A. L. Kazakov, S. M. Kukhto Kukhta, A. V. Mit'kovets, A. I. Murtazaliev, D. V. Povedailo, V. A. Khristoforov, O. V.
Copyright Year	2005
Abstract	The electron energy loss spectra (EELS) of indole, 3-indolyl propionic acid, 3-indolealdehyde, 3-dimethylaminomethylindole, tryptophan, and N-acetyl-L-tryptophan in the gas phase upon excitation by monokinetic electrons with an energy of E$_{0}$ = 11–50 eV are obtained. The structure of EELS is determined in the main by the indole chromophore; the side groups, except for the C=O group of 3-indolealdehyde, exert an insignificant influence. The energy of the lower triplet level $^{3}$L$_{a}$ is 3.3 eV for indole and its derivatives and 3.2 eV for tryptophan and N-acetyl-L-tryptophan. Four singlet transitions in the region of 4.4–7.2 eV have been identified. The molecules studied, except for tryptophan, fluoresce in the gas phase on excitation by electrons. At low values of E$_{0}$ (10–25 eV), the fluorescence spectra are similar and are due to the indole fluorophore. Just as in the case of optical excitation, fluorescence on excitation by electrons is associated with the $^{1}$L$_{b}$-S$_{0}$ transitions. An increase in the energy E$_{0}$ up to 60–80 eV leads to dissociation of a portion of the indole molecules and to the appearance of additional bands in the fluorescence spectrum.
Starting Page	503
Ending Page	508
Page Count	6
File Format	PDF
ISSN	00219037
Journal	Journal of Applied Spectroscopy
Volume Number	72
Issue Number	4
e-ISSN	15738647
Language	English
Publisher	Kluwer Academic Publishers-Consultants Bureau
Publisher Date	2005-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	electron electron energy loss spectrum fluorescence spectrum triplet and singlet energy levels Analytical Chemistry Atomic and Molecular Structure and Spectra
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Condensed Matter Physics

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