Abstract

To account for and identify the effects of cryocontamination, the infrared complex refractive-index ( $\overline{n}$ = n − ik) values of cryofilms of monomethyl hydrazine (MMH), hydrazine (N₂H₄), and nitrogen tetroxide (N₂O₄) were determined for the 500–3700-cm⁻¹ wave-number range. We use techniques similar to those described in an earlier paper [ B. E. Wood and J. A. Roux, J. Opt. Soc. Am. 72, 720 ( 1982)] for thin H₂O, CO₂, and NH₃ condensed-gas films. Thin MMH, N₂O₄, and N₂H₄ films from 0.25 to 9.0 μm thick were formed on a germanium substrate at 20 and 80 K in vacuum, and the infrared transmittances were measured by using a Fourier-transform spectrometer. Values of the optical properties (n, k) were derived from the experimental transmittance data by using a nonlinear least-squares method with a thin-film-transmittance analytical model. These optical constants were compared with results obtained with the subtractive Kramers–Kronig technique. These optical properties are important for predicting the performance of contaminated optical components.

© 1983 Optical Society of America

Infrared optical properties of thin H₂O, NH₃, and CO₂ cryofilms

B. E. Wood and J. A. Roux
J. Opt. Soc. Am. 72(6) 720-728 (1982)

N₂ and CO vibrational CARS and H₂ rotational CARS spectroscopy of CH₄/N₂O flames

Kenneth Aron, Leonce E. Harris, and Joanne Fendell
Appl. Opt. 22(22) 3604-3611 (1983)

Experimental Doppler-limited spectra of the ν₂ bands of H₂¹⁶O, H₂¹⁷O, H₂¹⁸O, and HDO by Fourier-transform spectroscopy: secondary wave-number standards between 1066 and 2296 cm⁻¹

G. Guelachvili
J. Opt. Soc. Am. 73(2) 137-150 (1983)

Optical constants in the infrared for K₂SO₄, NH₄H₂PO₄, and H₂SO₄ in water*

Marvin R. Querry, Richard C. Waring, Wayne E. Holland, Leonard M. Earls, Mary D. Herrman, William P. Nijm, and George M. Hale
J. Opt. Soc. Am. 64(1) 39-46 (1974)

Theoretical calculations of N₂-broadened halfwidths of H₂O using quantum Fourier transform theory

Robert R. Gamache and Richard W. Davies
Appl. Opt. 22(24) 4013-4019 (1983)