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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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Anomalous fragmentation of hydrated clusters of DNA base adenine in UV photoionization

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Title
Anomalous fragmentation of hydrated clusters of DNA base adenine in UV photoionization
Author
Kim, NJKang, HJeong, GKim, Yung SamLee, KTKim, SK
Issue Date
2000-07
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY A, v.104, no.28, pp.6552 - 6557
Abstract
A multiphoton ionization study was carried out on hydrated clusters of DNA base adenine in supersonic molecular beams. Resonant two-photon ionization at 266 nm showed that the relative ion intensity between the hydrated clusters Am(H2O)n and the unhydrated ones was anomalously small, particularly for HI = 1, in contrast to the case of electron impact ionization. The ratio was of the order of 10-2 for m = l, 10-1 for m = 2, but about 1 for m ≥ 3. One-photon excitation to the first electronically excited state was found to be responsible for the extensive fragmentation of adenine monomer hydrates Am(H2O)n. The water acts as a proton-donating solvent whose hydrogen bonding with the solute becomes weakened in the *pi; excited state, thereby giving the excited state its repulsive nature. Hydrates of adenine complex Am(H2O)n (m > 2) tend to better survive the rupture of the water cage at higher m, probably because the energy transfer between adenine molecules is not sufficiently fast. The fragmentation was found to be less extensive at higher levels of excitation . with a much weaker nπ* character. Change of solvent to those of less proton-donating or even proton-accepting character systematically reduced the tendency of fragmentation.
URI
https://scholarworks.unist.ac.kr/handle/201301/8974
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0034228989
DOI
10.1021/jp000813+
ISSN
1089-5639
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CHM_Journal Papers
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