Absorption and emission spectra of matrix-isolated XeF, KrF, XeCl, and XeBr

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Abstract
Argon matrix samples of Kr/F2, Xe/F2, Xe/Cl2, and Xe/Br2 have been photolyzed at 20 K. Emission spectra using uv excitation and uv absorption spectra following photolysis are assigned to the KrF, XeF, XeCl, and XeBr molecules. Vibrational spacings on two KrF and two XeF absorption bands are near RbF and CsF values, which supports the ionic model for the excited states. The vibronic KrF and XeF absorptions, and two very sharp XeCl bands, indicate ground state potential function minima near the ionic excited state values. This suggests that chemical bonding effects are significant in ground state KrF, XeF, and XeCl.