Pressure Dependence of the Water Vapor Continuum Absorption in the 3.5 to 4.0 Micrometer Region.
Abstract
Measurements of water vapor continuum absorption in the 3.5- to 4.0-micrometer region are presented. A deuterium fluoride grating tunable laser was used in conjunction with a 21-m long-path absorption cell. Measurements were performed at 25 C with 14.3 torr of deuterium depleted water vapor (one-fiftieth the normal concentration of HDO) buffered by pressures of 0, 250, 500, 750, 1000, and 1250 torr of an 80/20 mixture of N2/O2. From the measurements of the water vapor continuum absorption at 26 laser lines for the six foreign broadening pressures, a foreign-to-self-broadening coefficient of 0.011 with a factor of 2 uncertainty was obtained. This coefficient is an order of magnitude smaller than the value of 0.12 measured (under higher temperature and pressure conditions) by other workers.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1978
- Accession Number
- ADA061608
Entities
People
- Brian Z. Sojka
- Kenneth O. White
- Lanny R. Bower
- Wendell R. Watkins
Organizations
- Atmospheric Sciences Laboratory