Anomalous enrichment of {sup 17}O and {sup 13}C in photodissociation products of CO{sub 2}: Possible role of nuclear spin
- Physical Research Laboratory, Navrangpura, Ahmedabad 380 009 (India)
Oxygen and carbon isotope fractionation associated with products (CO and O{sub 2}) of gas phase photodissociation of CO{sub 2} have been studied using photons from Hg lamp (184.9 nm) and Kr lamp (123.6 and 116.5 nm). In dissociation by Hg lamp photons both CO and O{sub 2} are enriched in {sup 17}O by about 81 per mille compared to the estimate based on a kinetic model. Additionally, CO is enriched in {sup 13}C by about 37 per mille relative to the model composition. In contrast, in dissociation by higher energy Kr lamp photons no such anomaly was found in O{sub 2}. The observed isotopic enrichments in case of Hg lamp dissociation are proposed to be due to a hyperfine interaction between nuclear spin and electron spins or orbital motion causing enhanced dissociation of isotopologues of CO{sub 2} containing {sup 17}O and {sup 13}C. The {sup 17}O enrichment is higher than that of {sup 13}C by a factor of 2.2{+-}0.2 which can be explained by the known magnetic moment ratio of {sup 17}O and {sup 13}C due to differing nuclear spins and g-factors. These results have potential implications in studies of the planetary atmospheres.
- OSTI ID:
- 21559733
- Journal Information:
- Journal of Chemical Physics, Vol. 130, Issue 23; Other Information: DOI: 10.1063/1.3153845; (c) 2009 American Institute of Physics; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBON 13
CARBON DIOXIDE
CARBON MONOXIDE
DISSOCIATION
ELECTRONS
ENRICHMENT
FRACTIONATION
INTERACTIONS
LANDE FACTOR
LIGHT BULBS
MAGNETIC MOMENTS
OXYGEN
OXYGEN 17
PHOTOLYSIS
PHOTON-MOLECULE COLLISIONS
PHOTONS
PLANETARY ATMOSPHERES
SPIN
ANGULAR MOMENTUM
ATMOSPHERES
BOSONS
CARBON COMPOUNDS
CARBON ISOTOPES
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COLLISIONS
DECOMPOSITION
DIMENSIONLESS NUMBERS
ELEMENTARY PARTICLES
ELEMENTS
EVEN-ODD NUCLEI
FERMIONS
ISOTOPES
LEPTONS
LIGHT NUCLEI
MASSLESS PARTICLES
MOLECULE COLLISIONS
NONMETALS
NUCLEI
OXIDES
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PARTICLE PROPERTIES
PHOTOCHEMICAL REACTIONS
PHOTON COLLISIONS
SEPARATION PROCESSES
STABLE ISOTOPES