The ((B)over-tilde(2)A '<-(X)over-tilde(2)A ') laser induced fluorescence excitation spectrum of DCO in a supersonic jet expansion

The laser induced fluorescence (LIF) excitation spectrum of DCO ((B) over t ilde (2)A' <-- (X) over tilde (2)A') has been investigated in a supersonic free jet expansion. Eleven vibrational bands including the origin band were observed in the energy range from 38 600 to 42 500 cm(-1). The band intens ities were found to decrease rapidly with increasing excitation in the (B) over tilde state due to fast predissociation. High resolution spectra were recorded for the (000), (001), (010) and (100) vibrational bands to determi ne precise fundamental vibrational term energies and rotational constants a nd spin-rotation constants of the (B) over tilde state. The data were used to derive the following structural parameters for DCO ((B) over tilde): r(D -C) = 1.121(6) Angstrom, r(C-O) = 1.371(1) Angstrom and (DCO) = 105.1(2)deg rees.