Accession Number : ADA189071

Title :   Infrared Absorption by Molecular Clusters in Water Vapor.

Descriptive Note : Technical rept. Jan 78-Dec 82,

Corporate Author : CHEMICAL RESEARCH DEVELOPMENT AND ENGINEERING CENTER ABERDEEN PROVING GROUND MD

Personal Author(s) : Carlon, Hugh R

PDF Url : ADA189071

Report Date : Dec 1987

Pagination or Media Count : 80

Abstract : The problem of infrared absorption by molecular clusters in water vapor has been investigated by parallel researches into four different aspects of the problem: (1) measurements of the infrared emission of steam and of steam-generated water vapor; (2) measurements of the electrical conductivity of moist air humidified by steam; (3) modeling of simple cluster configurations and comparison of theory with experimental data; and (4) a complete study of the thermodynamics of clustering up to the critical temperature of water. The results indicate that ions are important in the formation of ion hydrates or ion-induced, neutral water clusters, which are found in great numbers in water vapor and moist air. Populations of these clusters are present in peaked distributions, probably with mean sizes of about 10 molecules per cluster. They exist independently of homogeneous clusters like the water dimer, which may also be significant in atmospheric processes. Keywords: Infrared absorption, Electrical conductivity, Steam, Infrared emission, Water vapor, Ions.

Descriptors :   *ABSORPTION, *CLUSTERING, *HIGH HUMIDITY, *INFRARED RADIATION, *MOLECULES, *STEAM, ATMOSPHERIC PHYSICS, COMPARISON, CRITICAL TEMPERATURE, DIMERS, ELECTRICAL CONDUCTIVITY, EMISSION, EXPERIMENTAL DATA, HOMOGENEITY, HYDRATES, IONS, MEAN, NEUTRAL, POPULATION, SIZES(DIMENSIONS), THEORY, THERMODYNAMICS, WATER, WATER VAPOR

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE