Phase Transition Changes in Absorptivity of Simple Molecules in the Infrared.
Technical rept. Jul 70-Apr 71,
EDGEWOOD ARSENAL MD
Pagination or Media Count:
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 liquidvapor transition are calculated and tabulated. It is shown that extrapolation of spectral data between physical phases and meaningful study of vaporaerosol mixtures in the infrared cannot be accomplished without an understanding of these phase transition effects. An obvious extension would be solidliquid transition studies, particularly for ice effects in atmospheric investigations. Author
- Atomic and Molecular Physics and Spectroscopy