Knowledge Bank

The infrared spectrum of gas phase aminodifluoroborane. $NH2BF2$: has been observed for the first time. A partial assignment to the fundamental vibrations has been made. The $210$ band has been recorded at high resolution, and the rotational and centrifugal distortion constants of NH211BF2 have been obtained in both the ground and $21$ levels. A small rotational perturbation in the $21$ level has been attributed to a perpendicular Coriolls interaction. Using a newly written least squares fitting program, spectroscople constants of the unseen level have been evaluated, including its band origin, and the Coriolis coupling coefficient. Possible identities of the unseen level are suggested.