Abstract
Laser-induced fluorescence of CsH from the A 1Σ + electronic state to the X 1Σ + state was recorded using high-resolution Fourier transform spectrometry. Ground-state vibrational levels were observed from ν″ = 1 to the dissociation limit. These measurements showed anomalies in the X 1Σ + potential energy curve due to the avoided crossing of ionic and covalent potential curves. Accurate molecular constants were derived for the lower X 1Σ + vibrational levels. The observation of a quasibound level gave the first experimental determination of the dissociation energy (in cm −1): 14802 ⩽ D c ⩽ 14813.
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