Experimental and computer modeling study of /sup 81/Br isotope enrichment by isotopically selective, two-step laser photodissociation of HBr

Journal Article · Mon Oct 01 04:00:00 EDT 1979 · J. Chem. Phys.; (United States)

OSTI ID:5887918

Zittel, P F; Little, D D

Molecular bromine enriched in /sup 81/Br has been observed mass spectrometrically following isotopically selective, two-step laser photodissociation of HBr in mixtures with NO. The dependence of isotopic enrichment and product yield on various experimental parameters was investigated. An extensive computer model was used to simulate the two-step enrichment process and gave fair agreement with experimental results. The computer model indicated that isotopic enrichment was limited in these experiments (i.e., /sup 81/Br/sub 2///sup 79/Br/sub 2/approx. =1.6, compared to the natural abundance ratio of 0.96) by Br isotope exchange during chemical scavenging and not by the initial two-step photodissociation process. Computer modeling studies of the effect of adding high pressures of rare gas to the HBr--NO mixtures suggest that much higher isotopic enrichments are possible. Enrichment of /sup 81/Br in the C/sub 2/H/sub 5/Br product of isotopically selective, two-step laser photodissociation of HBr in C/sub 2/H/sub 4/ mixtures has also been observed experimentally.

• Research Organization: Chemistry and Physics Laboratory, The Ivan A. Getting Laboratories, The Aerospace Corporation, Los Angeles, California 90009
• OSTI ID: 5887918
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 71:7; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400203* -- Isotope Exchange & Isotope Separation-- (-1987)
ALKENES
BROMINE 81
BROMINE ISOTOPES
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
DISPERSIONS
ETHYLENE
HYDROBROMIC ACID
HYDROCARBONS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
INTERMEDIATE MASS NUCLEI
ISOTOPE SEPARATION
ISOTOPES
LASER ISOTOPE SEPARATION
MIXTURES
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
SEPARATION PROCESSES
SIMULATION
STABLE ISOTOPES