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Kim, Yung Sam
Ultrafast 2D IR Spectroscopy Lab
Research Interests
  • 2D IR, chemical exchange of H-bond, fast reaction dynamics, protein dynamics

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Even-odd alternation in mass spectrum of thymine and uracil clusters: Evidence of intracluster photodimerization

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Title
Even-odd alternation in mass spectrum of thymine and uracil clusters: Evidence of intracluster photodimerization
Author
Kim, NJKang, HJeong, GKim, Yung SamLee, KTKim, SK
Issue Date
2001-04
Publisher
NATL ACAD SCIENCES
Citation
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OFAMERICA, v.98, no.9, pp.4841 - 4843
Abstract
Multiphoton ionization of thymine and uracil clusters generated by a supersonic molecular beam gave rise to a remarkable alternation of mass spectral intensities between even- and odd-numbered clusters. Such alternation was observed in clusters of up to 30 molecules. Excitation to the two lowest electronically excited states seemed to be a strong prerequisite. In view of the well known photodimerization reaction of thymine and uracil in the bulk phase, it is proposed that such alternation in the mass spectral intensity resulted from formation of photodimer units within the cluster on intense UV irradiation. Several analogues of thymine with no known propensity for photodimerization in the bulk phase did not exhibit any sign of such alternation in the cluster mass spectrum. The intrinsic UV window for photodimerization, and hence photoinduced mammalian mutagenesis, was estimated to be approximately 210-280 nm, significantly narrower than the previously reported bulk values of 150-300 nm.
URI
https://scholarworks.unist.ac.kr/handle/201301/8973
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0035942183
DOI
10.1073/pnas.091094998
ISSN
0027-8424
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CHM_Journal Papers
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