Hydrated thymine cluster in the supersonic gas jet.
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 10(6) to 10(9) W cm(-2). In the condition of low laser intensity, the peaks corresponding to hydrated thymine clusters [(C(5)H(6)N(2)O(2))(m)(H(2)O)(n)] and large mass fragments from them were obtained mainly. In the laser intensity region from 10(7) to 10(8) W cm(-2), the fragment ions released from thymine such as HCNH(+), HNCO(+), CH(2)CCHNH(+), CH(3)CCHNH(+), C(3)H(4)O(+), etc. were mainly detected due to C-C and C-N bond breaks in a ring structure of thymine.
Kagawa
Takeshi
T
Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Osaka University, Suita, Osaka, Japan. kagawa@nf.eie.eng.osaka-u.ac.jp
Aikawa
Koji
K
Sato
Fuminobu
F
Kato
Yushi
Y
Iida
Toshiyuki
T
D016000:Cluster Analysis; D003198:Computer Simulation; D004247:DNA / Q000737:chemistry* / Q000528:radiation effects*; D004249:DNA Damage; D004307:Dose-Response Relationship, Radiation; D005740:Gases / Q000737:chemistry; D008956:Models, Chemical; D011829:Radiation Dosage; D011874:Radiometry / Q000379:methods; D013941:Thymine / Q000737:chemistry* / Q000528:radiation effects*; D014466:Ultraviolet Rays; D014867:Water / Q000737:chemistry*
D005740:Gases; D014867:Water; D004247:DNA; D013941:Thymine