Abstract

Ultrasensitive wavelength-dependent laser-ionization mass spectrometry is applied to spectroscopic studies of argon–benzene van der Waals molecules and isotopically substituted benzene molecules. Argon–benzene fragments either in its ¹B_2u excited electronic state or subsequent to being ionized. Substitution of a single ¹³C atom in the benzene monomer ring leads to an observable spectroscopic splitting whose magnitude can be accurately predicted from the ¹B_2u excited-state force field recently developed by Krogh-Jesperson et al. [ J. Phys. Chem. 88, 5503 ( 1984)].

© 1985 Optical Society of America

Fluorescence-dip and stimulated-emission-pumping laser-induced-fluorescence spectra of van der Waals molecules containing benzonitrile

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