Absorption coefficients of solid NH_3 from 50 to 7000 cm^-1.

Publication

Reference: Sill G., Fink U., Ferraro J.~R. (1980). Absorption coefficients of solid NH$_3$ from 50 to 7000 cm$^-1$.. J. Opt. Soc. Am., 70, 724 - 739.

Names

Title: Absorption coefficients of solid NH$_3$ from 50 to 7000 cm$^-1$.
Abstract: Thin-film spectra of solid NH3 at a resolution of 1 per cm were used to determine its absorption coefficient over the range 50-7000 per cm. The thin films were formed inside a liquid N$_2$ cooled dewar using a variety of substrates and dewar windows. The spectra were recorded with two Fourier spectrometers, one covering the range from 1 to 4 microns and the other from 2.6 to 200 microns. The thickness of the films was measured with a laser interference technique. The absorption coefficients were determined by application of Lambert's law and by a fitting procedure to the observed spectra using thin-film theory. Good agreement was found with the absorption coefficients recently determined by other investigators over a more restricted wavelength range. A metastable phase was observed near a temperature of 90 K and its absorption coefficient is reported. No other major spectral changes with temperature were noted for the range 88-120 K.
Keywords: spectroscopy, transmission, absorbance spectra, absorption coefficient, band position, VUV, far-IR, mid-IR, near-IR, thickness, low temperature, phase change, crystalline, metastable, molecular solid, ice, NH3, Jupiter Atmosphere, Saturn Rings
Content: spectral data, band list data, sample

Doi

10.1364/JOSA.70.000724

Identifiers