Experimental evidence on the mechanism of dissociative electron attachment to formic acid
- Janečková, Radmila Department of Chemistry, University of Fribourg, Switzerland
- Kubala, Dušan Department of Chemistry, University of Fribourg, Switzerland
- May, Olivier Department of Chemistry, University of Fribourg, Switzerland
- Fedor, Juraj Department of Chemistry, University of Fribourg, Switzerland
- Allan, Michael Department of Chemistry, University of Fribourg, Switzerland
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20.11.2013
Published in:
- Physical Review Letters. - 2013, vol. 111, no. 21, p. 213201
English
Two mechanisms for dissociative electron attachment in HCOOH, the formation of HCOO−+H, were proposed in the literature: (i) via a direct electron attachment into a σ∗ resonance, augmented by dipole binding of the incident electron [G. A. Gallup et al., Phys. Rev. A 79, 042701 (2009)], and (ii) with the 1.8 eV π∗ resonance as a doorway state, linked to the products by symmetry lowering–distortion of the temporary anion, primarily the CH bond, from the planar symmetry [T. N. Rescigno et al., Phys. Rev. Lett. 96, 213201 (2006)]. The later mechanism implies a reduction of the cross section upon deuteration of the hydrogen bonded to the C atom, whereas the former mechanism would leave the cross section unaffected. Our experimental absolute cross sections for the four isotopomers of formic acid show that deuteration on the C atom reduces the cross section value only marginally (by 12%) compared to deuteration on the O atom (reduction by a factor of 16), and thus favor mechanism (i).
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Chimie
- Language
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- English
- Classification
- Chemistry
- License
- License undefined
- Identifiers
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- RERO DOC 209239
- DOI 10.1103/PhysRevLett.111.213201
- Persistent URL
- https://folia.unifr.ch/unifr/documents/303378
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