HIGH-RESOLUTION LASER SPECTROSCOPY OF THE B1-PI-X1-SIGMA+ TRANSITION OF (NAK)-NA-23-K-39, AND THE PERTURBATION BETWEEN THE B1-PI AND C3-SIGMA+ STATES

The Doppler-free laser polarization spectrum of the B1Π- X1Σ+ transition of 23Na39K was measured, and the molecular constants of the B1Π state of υ = 0∼16 were determined. The perturbation between the B1Π (υ = 8) and the c3Σ+ (υ = 22) levels at small J were studied in detail. By comparing the observed line intensities of the B1Π(υ= 16, J = 14) - X1Σ +(υ = 0∼50, J = 13 and 15) transition with the calculated Franck-Condon factors, the dependence of the transition dipole moment on the internuclear distance was determined. Absolute vibrational numbering of the c32+ state was done by comparing the calculated Franck-Condon factors with the observed line intensities of the c 32+-a3Σ+ transition. © 1990 American Institute of Physics.