Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Stable isotope studies. Annual progress report, March 1, 1980-February 28, 1981

Technical Report ·
DOI:https://doi.org/10.2172/6715826· OSTI ID:6715826
Vapor pressures of /sup 12/CHF/sub 3/, /sup 13/CHF/sub 3/, and /sup 12/CDF/sub 3/ were measured between -147 and -60/sup 0/C. The normal isotope effect of deuterium with a positive slope and the inverse isotope effect of /sup 13/C with a negative slope in the plot of T 1n(P'/P) vs 1/T are simultaneously explanable only in terms of a blue-shift in the C-H stretching frequency upon condensation of fluoroform molecules. Vapor pressures of /sup 12/CH/sub 3/F, /sup 13/CH/sub 3/F, and /sup 12/CD/sub 3/F were also measured between -141 and -60/sup 0/C. The deuterium effect is a normal isotope effect with a large positive slope. The /sup 13/C effect is an inverse isotope effect with a slightly positive slope. A nitrogen-15 exchange column based on the pressurized NO/N/sub 2/O/sub 3/ system was constructed. New refluxer designs were developed. Two FORTRAN programs have been written for studies of differential isotope effect.
Research Organization:
State Univ. of New York, Stony Brook (USA). Dept. of Chemistry
DOE Contract Number:
AC02-80ER10612
OSTI ID:
6715826
Report Number(s):
DOE/ER/10612-1
Country of Publication:
United States
Language:
English