The Diode Laser Spectrum of Iodine Fluoride (IF)in the Ground Electronic State

Abstract

To Professor Helmut Dreizler on the Occasion of his 60 th BirthdayThe infrared absorption spectrum of the gas phase IF molecule in its ground state has been observed for the first time, using a diode laser spectrometer. The wavenumbers of transitions in the v -\ «-0, and v -2 «-1 bands have been measured with a nominal accuracy of +0.001 cm"1. These data were fitted along with the recently published microwave spectrum to produce an improved set Dunham T-parameters. Also the coefficients of the Dunham potential function for the electronic state of IF were determined by a direct fit to the experimental data.

Hyperfine constants of bromine and iodine monofluoride

“…5 BrF disproportionates to Br 2 and BrF 3 , and IF to I 2 and IF 5 . 6 Nevertheless, both have been subjects of a number of rotational 7-12 and vibrational [13][14][15][16][17] spectroscopic studies. These have produced rotational and centrifugal distortion constants as well as Br and I hyperfine constants.…”