High resolution dissociative electron attachment to gas phase adenine

Journal Article · Mon Aug 28 04:00:00 EDT 2006 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.2336775· OSTI ID:20864286

Huber, D; Beikircher, M; Denifl, S; Zappa, F; Matejcik, S; Bacher, A; Grill, V; Maerk, T D; Scheier, P ^[1]

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1. Institut fuer Ionenphysik und Angewandte Physik and Center for Molecular Biosciences, Leopold Franzens Universitaet Innsbruck, Technikerstrasse 25, A-6020 Innsbruck (Austria)

The dissociative electron attachment to the gas phase nucleobase adenine is studied using two different experiments. A double focusing sector field mass spectrometer is utilized for measurements requiring high mass resolution, high sensitivity, and relative ion yields for all the fragment anions and a hemispherical electron monochromator instrument for high electron energy resolution. The negative ion mass spectra are discussed at two different electron energies of 2 and 6 eV. In contrast to previous gas phase studies a number of new negative ions are discovered in the mass spectra. The ion efficiency curves for the negative ions of adenine are measured for the electron energy range from about 0 to 15 eV with an electron energy resolution of about 100 meV. The total anion yield derived via the summation of all measured fragment anions is compared with the total cross section for negative ion formation measured recently without mass spectrometry. For adenine the shape of the two cross section curves agrees well, taking into account the different electron energy resolutions; however, for thymine some peculiar differences are observed.

• OSTI ID: 20864286
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 8 Vol. 125; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
60 APPLIED LIFE SCIENCES
ADENINES
ANIONS
DISSOCIATION
ELECTRON ATTACHMENT
ELECTRON-MOLECULE COLLISIONS
ELECTRONS
ENERGY RESOLUTION
EV RANGE 01-10
EV RANGE 10-100
MASS RESOLUTION
MASS SPECTRA
MASS SPECTROMETERS
MASS SPECTROSCOPY
MEV RANGE 10-100
PHASE STUDIES
SENSITIVITY
TOTAL CROSS SECTIONS