The (1, 0), (0, 1) and (0, 2) bands of D --> X system of lead monoxide
have been excited in RF discharge source and photographed in the seve
nth order of a 2-meter PGS. Intensity records of the rotational lines
have been obtained. Rotational constants and the intensity measurement
s of Q and P branch lines of the above three bands and J numbering are
used to calculate the effective rotational temperature of the source
emitting the spectrum of Pb-208 O-16 molecule.