The ngr;1(Cndash;D stretch, ngr;0=1909.774 cmminus;1) and ngr;3(Cndash;O stretch, ngr;0=1794.587 cmminus;1) fundamental bands of the deuterated formyl radical DCO have been studied by the technique of CO laser magnetic resonance spectroscopy in the 5.2 to 5.6 mgr;m region. DCO was produced in a flow system by reacting F atoms from a microwave discharge in CF4+He with D2CO molecules. Numerous relatively strongahyphen;type (Dgr;Ka=0) resonances and a few weakerbhyphen;type (Dgr;Ka=plusmn;1) resonances were recorded for ngr;1, whereas for ngr;3the resonances were weak and entirelybtype. The data were assigned to transitions involving 1les;Nles;9 and 0les;Kales;7, and the two bands were analyzed in a simultaneous fit which included the effects of Coriolis and higher order interactions which couple the two vibrations. The results of the analysis were the band origins and the rotational, centrifugal distortion, spinndash;rotation, and Coriolis coupling constants for thev1=1 andv3=1 states, as well as some improved constants for the ground vibtational state. The ngr;1and ngr;3band origins show quite large shifts from their previously determined values in solid matrices at low temperatures.
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