Photofragmentation of 2-deoxy-D-ribose molecules in the gas phase (Articolo in rivista)

Type
Label
  • Photofragmentation of 2-deoxy-D-ribose molecules in the gas phase (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1002/cphc.200700635 (literal)
Alternative label
  • Vall-Ilosera, G; Huels, MA; Coreno, M; Kivimaki, A; Jakubowska, K; Stankiewicz, M; Rachlew, E (2008)
    Photofragmentation of 2-deoxy-D-ribose molecules in the gas phase
    in ChemPhysChem (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Vall-Ilosera, G; Huels, MA; Coreno, M; Kivimaki, A; Jakubowska, K; Stankiewicz, M; Rachlew, E (literal)
Pagina inizio
  • 1020 (literal)
Pagina fine
  • 1029 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 9 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 7 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • \"[Vall-Ilosera, Gemma; Jakubowska, Katarzyna; Rachlew, Elisabeth] Royal Inst Technol, Sch Engn Sci, Dept Phys, SE-10691 Stockholm, Sweden; [Huels, Michael A.] Univ Sherbrooke, Fac Med & Hlth Sci, Dept Med Nucl & Radiobiol, Sherbrooke, PQ J1H 5N4, Canada; [Coreno, Marcello] CNR, IMIP, I-00016 Monterotondo, Italy; [Kivimaki, Antti] CNR, INFM, Lab Nazl TASC, I-34012 Trieste, Italy; [Stankiewicz, Marek] Mariana Smoluchowskiego Univ Jagiellonski, Inst Fizyki, PL-30059 Krakow, Poland (literal)
Titolo
  • Photofragmentation of 2-deoxy-D-ribose molecules in the gas phase (literal)
Abstract
  • We have measured the synchrotron-induced photofragmentation of isolated 2-deoxy-D-ribose molecules (C5H10O4) at four photon energies, namely, 23.0, 15.7, 14.6, and 13.8 eV At all photon energies above the molecule's ionization threshold, we observe the formation of a large variety of molecular cation fragments, including CH3+, OH+, H3O+, C2H3+, C2H4+, CHxO+ (x=1,2,3), C2HxO+ (x=1-5), C3HxO+ (x=3-5), C2H4O2+, C3HxO2+ (x=1,2,4-6), C4H5O2+, C4HxO3+ (x=6,7), C5H7O3+, and C5H8O3+. The formation of these fragments shows a strong propensity of the DNA sugar to dissociate upon absorption of vacuum ultraviolet photons. The yields of particular fragments at various excitation photon energies in the range between 10 and 28 eV are also measured and their appearance thresholds determined. At all photon energies, the most intense relative yield is recorded for the m/q = 57 fragment (C3H5O+), whereas a general intensity decrease is observed for all other fragments- relative to the m/q=57 fragment-with decreasing excitation energy. Thus, bond cleavage depends on the photon energy deposited in the molecule. All fragments up to m/q=75 are observed at all photon energies above their respective threshold values. Most notably, several fragmentation products, for example, CH3+, H3O+, C2H4+, CH3O+, and C2H5O+, involve significant bond rearrangements and nuclear motion during the dissociation time. Multibond fragmentation of the sugar moiety in the sugar-phosphate backbone of DNA results in complex strand lesions and, most likely, in subsequent reactions of the neutral or charged fragments with the surrounding DNA molecules. (literal)
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