Abstract
The radiative lifetimes and optical excitation functions have been measured for the e 3Σ−(v = 2, 3, 4) levels of CO using pulsed low energy electron impact excitation and delayed coincidence detection. The v = 2, 3, and 4 lifetimes were found to be 4.12±0.14, 4.08±0.29, and 3.73±0.06 μs, respectively. Cascade components were observed to feed all three vibrational levels and these lifetimes were measured to be 13.8±6.5, 11.8±1.3, and 14.9±3.6 μs. The threshold energies of these states are discussed. The optical excitation functions indicated the presence of thresholds above those of the e states which appear to be due to nearby Asundi band vibrational levels ranging from v = 8 to v = 16.
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