Electronic relaxation induced by the dissociation of van der Waals complexes: Intersystem crossing in 1A u Ar and He glyoxal complexes

Abstract

The formation of helium and argon glyoxal complexes has been observed. Their lines and bands have been identified from fluorescence excitation spectra in a supersonic jet. Rapid dissociation of the complexes has been shown for all vibronic levels. Further, it has been shown that this dissociation proceeds either to fluorescent or nonfluorescent levels, depending on the vibronic energy and the complex size. The nonfluorescent state has been identified as the phosphorescent ³A_u state.