Spectrochemistry of solutions. Part 20.—The infrared, near infrared and visible spectra of liquid ammonia

Abstract

The infrared, near-infrared and visible spectra of liquid ammonia at 293 K have been recorded. The fundamental and first six overtone regions have been assigned on the basis of the existence of four overtone progressions. The spectral data have been interpreted, together with other published spectral data, in terms of a model in which the local environment of the ammonia molecules is the predominating influence. Evidence is presented for the existence, in the liquid, of ammonia molecules with 0, 1, 2 or 3 hydrogen bonds.