dc.contributor.author
Kopyra, Janina
dc.contributor.author
König-Lehmann, Constanze
dc.contributor.author
Illenberger, Eugen
dc.date.accessioned
2018-06-08T04:04:29Z
dc.date.available
2015-11-03T08:18:55.311Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/16528
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-20709
dc.description.abstract
Negative ion formation following resonant electron attachment to the three
title molecules is studied by means of a beam experiment with mass
spectrometric detection of the anions. All three molecules exhibit a
pronounced resonance in the energy range around 1 eV which decomposes by the
loss of a neutral hydrogen atom thereby generating the closed shell anion
(M–H)− (or RCOO−), a reaction which is also a common feature in the non-
substituted organic acids. The two chlorine containing molecules CCl3COOH and
CClF2COOH exhibit an additional strong and narrow resonance at very low energy
(close to 0 eV) which decomposes by the cleavage of the C–Cl bond with the
excess charge finally localised on either of the two fragments Cl− and
(M–Cl)−. This reaction is by two to three orders of magnitude more effective
than hydrogen loss. Apart from these direct bond cleavages (C–Cl, O–H)
resonant attachment of subexcitation electrons trigger additional remarkably
complex unimolecular decompositions leading, e.g., to the formation of the
bihalide ions ClHCl− and ClHF− from CCl3COOH and CClF2COOH, respectively, or
the loss of a neutral CF2 unit from trifluoroalanine thereby generating the
fluoroglycine radical anion. These reactions require substantial rearrangement
in the transitory negative ion, i.e., the cleavage of different bonds and
formation of new bonds. F− from both chlorodifluoroacetic acid and
trifluoroalanine is formed at comparatively low intensity (more than three
orders of magnitude less than Cl− from the chlorine containing molecules) and
predominantly within a broad resonant feature around 7–8 eV characterised as
core excited resonance.
en
dc.rights.uri
http://publishing.aip.org/authors/web-posting-guidelines
dc.subject.ddc
500 Naturwissenschaften und Mathematik::540 Chemie
dc.title
Low energy (0–10 eV) electron driven reactions in the halogenated organic
acids CCl3COOH, CClF2COOH, and CF3CHNH2COOH (trifluoroalanine)
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation
J. Chem. Phys. - 135 (2015), Artikel Nr. 124307
dcterms.bibliographicCitation.doi
10.1063/1.3641479
dcterms.bibliographicCitation.url
http://dx.doi.org/10.1063/1.3641479
refubium.affiliation
Biologie, Chemie, Pharmazie
de
refubium.funding
OpenAccess Publikation in Allianzlizenz
refubium.mycore.fudocsId
FUDOCS_document_000000023399
refubium.resourceType.isindependentpub
no
refubium.mycore.derivateId
FUDOCS_derivate_000000005616
dcterms.accessRights.openaire
open access