THE INTERACTING B(4)SIGMA(-) AND D(2)PI STATES OF CRN - A LASER-INDUCED AND DISPERSED FLUORESCENCE STUDY

Chromium mononitride molecules have been produced in a laser vaporizat ion molecular beam source using Cr metal and ammonia. The complex CrN LIF spectra between 430 and 490 nm have been examined in detail and re presentative bands in three new electronic subsystems, labeled B (4) S igma(-) <-- X (4) Sigma(-), d (II3/2)-I-2 <-- X (4) Sigma(-), and d (I I1/2)-I-2 <-- X (4) Sigma(-), have been rotationally analyzed. Perturb ations between the B (4) Sigma(-) and d (II)-I-2 states and their depe ndence on vibrational quantum numbers have been examined. Dispersed fl uorescence(DF) spectra have been recorded which provided a measure of the state mixing. The DF spectra also reveal the presence of an electr onic state of CrN with T similar to 6000 cm(-1), identified as the a ( 2) Sigma(-) state. Molecular parameters in the B (4) Sigma(-),d (II)-I -2, and a (2) Sigma(-) states; have been established. (C) 1997 America n Institute of Physics.