Infrared Spectrum and Vibrational Potential Function of AsF3

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Abstract
The infrared absorption spectrum of gaseous AsF3 has been determined over the spectral range 2000–200 cm−1. The contours of the fundamental bands indicate the correctness of the assignment of the fundamental frequencies made earlier from the Raman spectrum. Teller zeta values were determined from these contours; and from the frequencies, zetas, and a microwave value of the rotational distortion constant DJK, an attempt was made to evaluate the most general quadratic potential function of AsF3. The calculations showed that the DJK value must be in error and that highly precise values of distortion constants are required to determine off‐diagonal potential constants in AsF3. Values of the other general potential constants and DJ, DK, and DJK were calculated for several assumed values of the off‐diagonal constant F12.