Nitrogen isotopic fractionations in the low temperature (80 K) vacuum ultraviolet photodissociation of N 2
Abstract
N2 is a diatomic molecule with complex electronic structure. Interstate crossings are prominent in the high energy domain, introducing significant perturbations to the system. Nitrogen mainly photodissociates in the vacuum ultraviolet (VUV) region of the electromagnetic spectrum through both direct and indirect predissociation. Due to the complexity introduced by these perturbations, the nitrogen isotopic fractionation in N2 photodissociation is extremely hard to calculate, and an experimental approach is required. We present new data of N-isotopic fractionation in N2 photodissociation at low temperature (80 K), which shows a distinctly different15N enrichment profile compared to that at relatively higher temperatures (200 and 300 K). The new data, important to understanding the N-isotopic compositions measured in meteorites and other planetary bodies, are discussed in light of the knowledge of N2 photochemistry and calculated photoabsorption cross sections in the VUV.
- Authors:
-
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0356, USA
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; National Aeronautics and Space Administration (NASA)
- OSTI Identifier:
- 1324841
- Alternate Identifier(s):
- OSTI ID: 1420486; OSTI ID: 1459373
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Published Article
- Journal Name:
- Journal of Chemical Physics
- Additional Journal Information:
- Journal Name: Journal of Chemical Physics Journal Volume: 145 Journal Issue: 11; Journal ID: ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 79 ASTRONOMY AND ASTROPHYSICS; photochemistry; vacuum chambers; temperature measurement; photons; photodissociation; predissociation; dissociation; meteorites; ultraviolet light; wave functions
Citation Formats
Chakraborty, Subrata, Jackson, Teresa L., Rude, Bruce, Ahmed, Musahid, and Thiemens, M. H. Nitrogen isotopic fractionations in the low temperature (80 K) vacuum ultraviolet photodissociation of N 2. United States: N. p., 2016.
Web. doi:10.1063/1.4962447.
Chakraborty, Subrata, Jackson, Teresa L., Rude, Bruce, Ahmed, Musahid, & Thiemens, M. H. Nitrogen isotopic fractionations in the low temperature (80 K) vacuum ultraviolet photodissociation of N 2. United States. https://doi.org/10.1063/1.4962447
Chakraborty, Subrata, Jackson, Teresa L., Rude, Bruce, Ahmed, Musahid, and Thiemens, M. H. Thu .
"Nitrogen isotopic fractionations in the low temperature (80 K) vacuum ultraviolet photodissociation of N 2". United States. https://doi.org/10.1063/1.4962447.
@article{osti_1324841,
title = {Nitrogen isotopic fractionations in the low temperature (80 K) vacuum ultraviolet photodissociation of N 2},
author = {Chakraborty, Subrata and Jackson, Teresa L. and Rude, Bruce and Ahmed, Musahid and Thiemens, M. H.},
abstractNote = {N2 is a diatomic molecule with complex electronic structure. Interstate crossings are prominent in the high energy domain, introducing significant perturbations to the system. Nitrogen mainly photodissociates in the vacuum ultraviolet (VUV) region of the electromagnetic spectrum through both direct and indirect predissociation. Due to the complexity introduced by these perturbations, the nitrogen isotopic fractionation in N2 photodissociation is extremely hard to calculate, and an experimental approach is required. We present new data of N-isotopic fractionation in N2 photodissociation at low temperature (80 K), which shows a distinctly different15N enrichment profile compared to that at relatively higher temperatures (200 and 300 K). The new data, important to understanding the N-isotopic compositions measured in meteorites and other planetary bodies, are discussed in light of the knowledge of N2 photochemistry and calculated photoabsorption cross sections in the VUV.},
doi = {10.1063/1.4962447},
journal = {Journal of Chemical Physics},
number = 11,
volume = 145,
place = {United States},
year = {Thu Sep 15 00:00:00 EDT 2016},
month = {Thu Sep 15 00:00:00 EDT 2016}
}
https://doi.org/10.1063/1.4962447
Web of Science
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