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Remote Bond Breaking By Interacting Temporary Anion States, Paul Burrow, Gordon A. Gallup
Remote Bond Breaking By Interacting Temporary Anion States, Paul Burrow, Gordon A. Gallup
Paul Burrow Publications
The cross section for bond breaking at the site of a dissociative temporary negative ion state through the dissociative electron attachment process can be considerably enhanced by the presence of a second longer-lived temporary negative ion state elsewhere in the molecule, even one quite remote from the first. In a series of chloroalkenes possessing both C–Cl and C=C bonds separated by various distances, we show that the cross sections are determined by the lifetime of the lower anion state created by the mixing of the anion states of these two moieties, with the wave function’s coefficients giving the probability that …
Total Dissociative Electron Attachment Cross Sections For Molecular Constituents Of Dna, Kayvan Aflatooni, A.M. Scheer, Paul Burrow
Total Dissociative Electron Attachment Cross Sections For Molecular Constituents Of Dna, Kayvan Aflatooni, A.M. Scheer, Paul Burrow
Paul Burrow Publications
Total cross sections for the dissociative electron attachment process are presented for the DNA bases thymine, cytosine, and adenine and for three compounds used as surrogates for the ribose and phosphate groups, tetrahydrofuran, 3-hydroxytetrahydrofuran, and trimethylphosphate, respectively. Cross section magnitudes are obtained by observation of positive ion production and normalization to ionization cross sections calculated elsewhere using the binary-encounter-Bethe method. The average cross section of the three bases is 3–10 times smaller than the effective cross section per nucleotide reported for single strand breaks in surface-bound super-coiled DNA. Consequently, damage to the bases alone does not appear to account for …
Vibrational Feshbach Resonances In Uracil And Thymine, Paul Burrow, Gordon A. Gallup, Adam M. Scheer, G. Denifl, S. Ptasinska, T. Märk, P. Scheier
Vibrational Feshbach Resonances In Uracil And Thymine, Paul Burrow, Gordon A. Gallup, Adam M. Scheer, G. Denifl, S. Ptasinska, T. Märk, P. Scheier
Paul Burrow Publications
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 σ* orbital. Three distinct vibrational modes are identified, and their presence as VFRs is consistent with the amplitudes and bonding characteristics of the σ * 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 …