Vibrational Feshbach resonances in uracil and thymine.
J Chem Phys
; 124(12): 124310, 2006 Mar 28.
Article
em En
| MEDLINE
| ID: mdl-16599677
ABSTRACT
Sharp peaks in the dissociative electron attachment (DEA) cross sections of uracil and thymine at energies below 3 eV are assigned to vibrational Feshbach resonances (VFRs) arising from coupling between the dipole bound state and the temporary anion state associated with occupation of the lowest sigma* orbital. Three distinct vibrational modes are identified, and their presence as VFRs is consistent with the amplitudes and bonding characteristics of the sigma* orbital wave function. A deconvolution method is also employed to yield higher effective energy resolution in the DEA spectra. The site dependence of DEA cross sections is evaluated using methyl substituted uracil and thymine to block H atom loss selectively. Implications for the broader issue of DNA damage are briefly discussed.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Timina
/
Uracila
/
Físico-Química
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
J Chem Phys
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
Estados Unidos