Analysis of the B2Sigma--X2Pi (0-0) band in the12C1H,12C2H and13C1H isotopic radicals

The emission spectra of the 0-0 band of the B 2 Sigma - -X 2 Pi system for 12 C 1 H, 12 C 2 H and 13 C 1 H have been obtained using conventional spectroscopy and a Geissler tube. The spectrum was photographed under high resolution and calibrated against Th lines. The reduction of the spectrum for the individual bands has been performed via a non-linear least-squares fit with the effective Hamiltonian of Brown. By means of a direct fit the following constants for the v=0 levels in both electronic states have been computed: for B 2 Sigma - -B v , D v , H v , gamma v ; for X 2 Pi -A v , B v , D v , H v , rho v , q v , q Dv and gamma v and T Sigma v /-T Pi $ does not contain/imply values.