Rotational analysis of the c super(3) capital pi sub(u)-b super(3) capital pi sub(g) system of P sub(2)

The rotationally resolved spectra of the c super(3) capital pi sub(u)-b super(3) capital pi sub(g) system of P sub(2) in the 16620-17860 cm super(-1) region is reanalyzed here to obtain more assignments of the rotational lines and more accurate molecular constants. Approximately 500 spectral lines were assigned to six subbands: the Omega =0, 1 and 2 components of the (2, 3) band, the Omega =0 and 2 components of the (1, 3) band and the Omega =2 component of the (1, 2) band. Because of perturbations in the c super(3) capital pi sub(u) ( upsilon =2) state, the I>-doubling in the super(3) capital pi sub(2) - super(3) capital pi sub(2) subband of the (2, 3) band was resolved. By the weighted nonlinear least-squares fitting using two types of effective Hamiltonians, more accurate molecular constants for the upsilon =1 and 2 levels in the c super(3) capital pi sub(u) state and for the upsilon =2 and 3 levels in the b super(3) capital pi sub(g) state of P sub(2) were derived.