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Radiation Protection Dosimetry Advance Access originally published online on January 24, 2007
Radiation Protection Dosimetry 2006 122(1-4):95-99; doi:10.1093/rpd/ncl403
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Hydrated thymine cluster in the supersonic gas jet

Takeshi Kagawa*, Koji Aikawa, Fuminobu Sato, Yushi Kato and Toshiyuki Iida

Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan

* Corresponding author: kagawa{at}nf.eie.eng.osaka-u.ac.jp


  Abstract

Fragmentation of hydrated thymine clusters in the gas phase induced by UV laser pulse at 266 nm was studied by means of time-of-flight (TOF) mass spectrometry. Hydrated thymine clusters were produced by supersonic expansion in the gas jet in a high vacuum region. The range of laser intensity for ionisation of the gaseous targets was from 106 to 109 W cm–2. In the condition of low laser intensity, the peaks corresponding to hydrated thymine clusters [(C5H6N2O2)m(H2O)n] and large mass fragments from them were obtained mainly. In the laser intensity region from 107 to 108 W cm–2, the fragment ions released from thymine such as HCNH+, HNCO+, CH2CCHNH+, CH3CCHNH+, C3H4O+, etc. were mainly detected due to C–C and C–N bond breaks in a ring structure of thymine.


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