Phase Transition Changes in Absorptivity of Simple Molecules in the Infrared.
Abstract
Water and many other substances show marked increases in infrared absorptivity in the liquid phase when compared to the vapor phase. Absorptivity ratios generally increase with increasing wavelength. Quantitative liquid spectra are presented for water, acetone, diethyl ether, methanol, formic acid, acetic acid, and ethanol, from which absorptivity ratios for the liquid/vapor transition are calculated and tabulated. It is shown that extrapolation of spectral data between physical phases and meaningful study of vapor/aerosol mixtures in the infrared cannot be accomplished without an understanding of these phase transition effects. An obvious extension would be solid/liquid transition studies, particularly for ice effects in atmospheric investigations. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1971
- Accession Number
- AD0736332
Entities
People
- Hugh R. Carlon