1980
DOI: 10.1289/ehp.80363
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Negative ions of polyatomic molecules.

Abstract: In this paper general concepts relating to, and recent advances in, the study of negative ions of polyatomic molecules are discussed with emphasis on halocarbons. The topics dealt with in the paper are as follows: basic electron attachment processes, modes of electron capture by molecules, short-lived transient negative ions, dissociative electron attachment to ground-state molecules and to "hot" molecules (effects of temperature on electron attachment), parent negative ions, effect of density, nature, and sta… Show more

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Cited by 77 publications
(12 citation statements)
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“…The geometry of the NIR complex (interatomic distances and bond angles) starts to rearrange in response to the new electronic structure and a repulsive force may be develop when the NIR is formed. When the lifetime of the NIR is long enough, dissociative attachment results in the formation of a stable negative-ion fragment of the original particle [17,18]. The resonant character of DEA explains also the characteristic shape of the energy dependence of the cross-sections with their bell-shaped maxima at resonant energies.…”
Section: 11mentioning
confidence: 94%
“…The geometry of the NIR complex (interatomic distances and bond angles) starts to rearrange in response to the new electronic structure and a repulsive force may be develop when the NIR is formed. When the lifetime of the NIR is long enough, dissociative attachment results in the formation of a stable negative-ion fragment of the original particle [17,18]. The resonant character of DEA explains also the characteristic shape of the energy dependence of the cross-sections with their bell-shaped maxima at resonant energies.…”
Section: 11mentioning
confidence: 94%
“…In the gas phase, the fragmentation of a molecule by an electron can be quantified by estimating the energy-integrated dissociation cross section, σ fragment . In such experiments, σ fragment can be estimated indirectly by comparing to the calibration gas SF 6 , for which the energy-integrated cross section is well established and constant in a large range of temperature . From the measurements of the number of anions (i.e.…”
Section: Resultsmentioning
confidence: 99%
“…In such experiments, σ fragment can be estimated indirectly by comparing to the calibration gas SF 6 , for which the energy-integrated cross section is well established and constant in a large range of temperature. 47 From the measurements of the number of anions (i.e. N ion and N SF 6 ) and the increase of pressure (ΔP Metal(acac) 2 and ΔP SF 6 ) and by assuming the detection efficacy for all types of ions by the mass spectrometer is similar and the constant density of the electron current in average, 48 the integrated cross section can be expressed as: σ frag = σ SF 6 • (N ion /N SF 6 )•(ΔP SF 6 /ΔP Metal(acac) ).…”
Section: Resultsmentioning
confidence: 99%
“…The decomposition of ClAuS(CH 3 ) 2 can be quantified by evaluating the cross section for the production of the fragment. The energy-integrated cross section for the production of the chlorine anion can be obtained by comparing the [Cl] − ion signal to that of [SF 6 ] − , 53 for which the energy-integrated cross section is well known and constant in a wide range of temperature, 54 assuming the same detection efficiency for both anions. Thus, we found the energy-integrated cross section for the production of the [Cl] − anion to be in the order of ∼2 × 10 −16 cm 2 •eV, suggesting the high efficacy of electrons below 1 eV to produce Au atoms from the fragmentation of the ClAuS(CH 3 ) 2 precursors.…”
Section: ■ Results and Discussionmentioning
confidence: 99%