title: UV photodissociation dynamics of deprotonated 2'-deoxyadenosine 5'-monophosphate [5'-dAMP-H]-.
abstract: The UV photodissociation dynamics of deprotonated 2'-deoxyadenosine 5'-monophosphate ([5'-dAMP-H](-)) has been studied using a unique technique based on the coincident detection of the ion and the neutral fragments. The observed fragment ions are m/z 79 (PO(3)(-)), 97 (H(2)PO(4)(-)), 134 ([A-H](-)), 177 ([dAMP-H-A-H(2)O](-)), and 195 ([dAMP-H-A](-)), where "A" refers to a neutral adenine molecule. The relative abundances are comparable to that found in previous studies on [5'-dAMP-H](-) employing different excitation processes, i.e., collisions and UV photons. The fragmentation times of the major channels have been measured, and are all found to be on the microsecond time scale. The fragmentation mechanisms for all channels have been characterized using velocity correlation plots of the ion and neutral fragment(s). The findings show that none of the dissociation channels of [5'-dAMP-H](-) is UV specific and all proceed via statistical fragmentation on the ground state after internal conversion, a result similar to fragmentations induced by collisions.
authors.affiliation: Institut des Science Moléculaires d'Orsay, CNRS UMR 8214, Université Paris Sud 11, F-91405 Orsay Cedex, France.
authors.forename: S Sunil
authors.initials: SS
authors.lastname: Kumar
authors.forename: M
authors.initials: M
authors.lastname: Pérot-Taillandier
authors.forename: B
authors.initials: B
authors.lastname: Lucas
authors.forename: S
authors.initials: S
authors.lastname: Soorkia
authors.forename: M
authors.initials: M
authors.lastname: Barat
authors.forename: J A
authors.initials: JA
authors.lastname: Fayeton
mesh_terms: D003838:Deoxyadenine Nucleotides / Q000737:chemistry* / Q000528:radiation effects*; D009690:Nucleic Acid Conformation; D055668:Photochemical Processes / Q000528:radiation effects*; D011522:Protons; D014466:Ultraviolet Rays
chemical_list: D003838:Deoxyadenine Nucleotides; D011522:Protons; C012873:2'-deoxy-5'-adenosine monophosphate