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Negative ions of ethylene sulfite

Robertson, WD and Hammer, NI and Bartmess, JE and Compton, RN and Diri, K and Jordan, KD (2005) Negative ions of ethylene sulfite. Journal of Chemical Physics, 122 (20). ISSN 0021-9606

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The formation of negative ions in molecular beams of ethylene sulfite (ES, alternately called glycol sulfite or ethylene glycol, C2H4SO3) molecules has been studied using both Rydberg electron transfer (RET) and free electron attachment methods. RET experiments with jet-cooled ES show an unexpected broad profile of anion formation as a function of the effective quantum number (n*) of the excited rubidium atoms, with peaks at nmax*∼13.5 and 16.8. The peak at nmax*∼16.8 corresponds to an expected dipole-bound anion with an electron binding energy of 8.5 meV. It is speculated that the peak at nmax*∼13.5 derives from the formation of a distorted C2H4SO3- ion. We suggest that quasifree electron attachment promotes the breaking of one ring bond giving a long-lived acyclic anion and term this process incomplete dissociative electron attachment. Theoretical calculations of plausible ionic structures are presented and discussed. Electron beam studies of ES reveal the presence of multiple dissociative attachment channels, with the dominant fragment, SO2-, peaking at 1.3 eV and much weaker signals due to SO3-, SO-, and (ES-H)- peaking at 1.5, 1.7, and 0.9 eV, respectively. All of these products appear to originate from a broad temporary negative ion resonance centered at ∼1.4 eV. © 2005 American Institute of Physics.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Robertson, WD
Hammer, NI
Bartmess, JE
Compton, RN
Diri, K
Jordan, KDjordan@pitt.eduJORDAN
Centers: Other Centers, Institutes, Offices, or Units > Center for Molecular and Materials Simulations
Date: 22 May 2005
Date Type: Publication
Journal or Publication Title: Journal of Chemical Physics
Volume: 122
Number: 20
DOI or Unique Handle: 10.1063/1.1913578
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Refereed: Yes
ISSN: 0021-9606
PubMed ID: 15945736
Date Deposited: 29 Oct 2012 21:27
Last Modified: 02 Feb 2019 15:56


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