Abstract
The rotational relaxation in the A2Δ state of the deuterated methylidyne radical, CD, by Ar is studied. Emission from CD(A2Δ) formed in the ArF laser dissociation of deuterated ketene in the presence of several pressures of Ar was recorded with spectral and time resolution. Analysis of the temporal evolution of the emission led to a set of rotational relaxation rate constants that could be well represented by an exponential gap energy law with two adjustable parameters. The errors associated to the rate constant determination were found to be more important for the low rotational levels. Rate constants for CD(A2Δ) were found to be smaller than the values reported in the literature for the undeuterated methylidyne.
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