Accession Number : AD0657198

Title :   VIBRATIONAL RELAXATION IN CO2/D2O MIXTURES,

Corporate Author : MISSISSIPPI UNIV UNIVERSITY

Personal Author(s) : Shields,F. Douglas ; Burks,James Alton

Report Date : 15 AUG 1967

Pagination or Media Count : 22

Abstract : Sound absorption and velocity measurements were made in carbon dioxide/heavy water mixtures at 300, 400, and 500K. The results show that D2O is from 1/3 to 1/5 as efficient as H2O in de-exciting the bending mode vibration of CO2 in a molecular collision. The collision efficiency of D2O for de-exciting CO2 decreases with temperature at an even greater rate than does that of H2O. The large difference between D2O and H2O invalidates the chemical affinity explanation of effect of H2O on CO2. An approximate semi-classical calculation of the transition probability indicates that it is possible to attribute the relaxation to an interchange between the vibration of the CO2 and the rotation of the H2O or D2O. (Author)

Descriptors :   (*CARBON DIOXIDE, RELAXATION TIME), MOLECULAR ENERGY LEVELS, EXCITATION, ATTENUATION, WATER VAPOR, HEAVY WATER, SOUND, ABSORPTION, VELOCITY, ULTRASONIC RADIATION, INTERACTIONS, MOLECULAR SPECTROSCOPY

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE