INFRARED-EMISSION SPECTROSCOPY OF BF AND ALF

The high-resolution infrared emission spectrum of boron monofluoride w as recorded with a Fourier transform spectrometer. There are 359 trans itions of (BF)-B-11 with v = 1 --> 0 to v = 5 --> 4, and 94 transition s of (BF)-B-10 with v = 1 --> 0 to v = 3 --> 2 assigned. Improved Dunh am Y-ij coefficients for the ground X(1) Sigma(+) electronic state wer e determined from the infrared data combined with existing microwave d ata. The mass-reduced Dunham U-ij coefficients were also obtained alon g with Born-Oppenheimer breakdown constants. An effective Born-Oppenhe imer potential was determined by fitting the available data to the eig envalues of the radial Schrodinger equation containing a parameterized potential function. Finally, the relative transition dipole moments o f the major isotopomer (BF)-B-11 were also measured. For AlF, our prev ious measurements were extended to higher v add J, in order to obtain improved Dunham coefficients and an improved internuclear potential. ( C) 1995 Academic Press. Inc.