Dissociation of Molecules by Slow Electrons

Compton, R. N.; Bardsley, J. N.

doi:10.1007/978-1-4613-2357-0_4

Cited by 9 publications

(6 citation statements)

References 288 publications

(175 reference statements)

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“…One is struck immediately by the dramatic enhancement in the dissociation cross section as one goes to higher vibrational levels; the peak cross sections for the U; = 0 and the vi = 12 levels differ by nearly seven orders of magnitude. The similar well known enhancement of dissociative electron attachment to Hz with increasing vi is attributed (Compton and Bardsley 1984) to the increase in the classical electron capture radius as one goes to higher initial vibrational levels. For very short-lived resonances, this greatly increases the probability that the anion will survive long enough for the nuclei to separate to the stabilization radius.…”

Section: T(r) = Cand(r) T(r) = Ck(r)supporting

confidence: 60%

Resonant contributions to dissociation of H₂by low-energy electron impact

Atems

Wadehra

1993

J. Phys. B: At. Mol. Opt. Phys.

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A resonance theory of electron-impact vibrationd excitation of diatomic molecules is extended to the case where the final vibrational level of the molecule lies in the " h u m. 7he extended theory is applied to resonant dissoeiation of molecular hydrogen by low-energy electron impact. Theoretical moss sections for dissociation of ground-state H2 via the X '4 and B 2 C i resonance a~e presented and compared with thearetiad cmss sections obtained by other authors using non-resonant methods. An imponant aim of the present work is M study the effect of initial vibrational excitation on the dissociation cross section. It is found that fhe

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Section: T(r) = Cand(r) T(r) = Ck(r)supporting

confidence: 60%

Resonant contributions to dissociation of H₂by low-energy electron impact

Atems

Wadehra

1993

J. Phys. B: At. Mol. Opt. Phys.

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“…Typical radiative recombination cross sections are of the order of 10 À20 cm 2 [Compton and Bardsley, 1984]. This is three to five orders of magnitude smaller than typical DR cross sections [e.g., Mitchell, 1990] so the process in equation (1) can be safely ignored.…”

Section: General Electron-ion Collisionsmentioning

confidence: 92%

Dissociative recombination of N₂⁺, O₂⁺, and NO⁺: Rate coefficients for ground state and vibrationally excited ions

Sheehan¹

2004

J. Geophys. Res.

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We review recent advances in the study of the dissociative recombination of molecular ions with electrons with a primary emphasis on experimental studies. In particular, we focus on previous experimental measurements of recombination rates for N2+, O2+, and NO+ ions. In the context of this review, we present temperature dependent rate coefficients from recent merged beam studies of the dissociative recombination of N2+, O2+, and NO+ ions with electrons. Identifying underlying physical differences between the various experimental techniques enables a discussion of the effects of vibrational excitation on the dissociative recombination of these major ionospheric species of ions. For T < 1200 K, we conclude that the recombination rates for N2+, O2+, and NO+ ions in the ground electronic and vibrational states respectively are 2.2 × 10−7 (Te/300)−0.39 cm3 s−1, 1.95 × 10−7(Te/300)−0.70 cm3 s−1, and (3.5 ± 0.5) × 10−7(Te/300)−0.69 cm3 s−1. Vibrational excitation is shown to play a significant role in laboratory measurements of these recombination rates. For each of these species, vibrationally excited ions yielded a lower recombination rate than the ground state. We also discuss the recombination of these species of ions for T > 1200 K.

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“…Books and review articles on the interaction of electrons with atoms and molecules abound (Massey, Burhop, & Gilbody, 1969a,b;Hasted, 1972;Smirnov, 1982;Compton & Bardsley, 1984;McDaniel, 1989). In this review, we focus only on those topics pertinent to EITOFMS.…”

Section: Fundamentals Of Electron Ionizationmentioning

confidence: 98%

Electron ionization time‐of‐flight mass spectrometry: Historical review and current applications

Mirsaleh-Kohan

Robertson

Compton

2008

Mass Spectrometry Reviews

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This review presents an overview of electron ionization time-of-flight mass spectroscopy (EITOFMS), beginning with its early development to the employment of modern high-resolution electron ionization sources. The EITOFMS is demonstrated to be ideally suited for analytical and basic chemical physics studies. Studies of the formation of positive ions by electron ionization time-of-flight mass spectroscopy have been responsible for many of the known ionization potentials of molecules and radicals, as well as accepted bond dissociation energies for ions and neutral molecules. The application of TOFMS has been particularly important in the area of negative ion physics and chemistry. A wide variety of negative ion properties have been discovered and studied by using these methods including: autodetachment lifetimes, metastable dissociation, Rydberg electron transfer reactions and field detachment, SF(6) Scavenger method for detecting temporary negative ion states, and many others.

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Dissociation of Molecules by Slow Electrons

Cited by 9 publications

References 288 publications

Resonant contributions to dissociation of H₂by low-energy electron impact

Resonant contributions to dissociation of H₂by low-energy electron impact

Dissociative recombination of N₂⁺, O₂⁺, and NO⁺: Rate coefficients for ground state and vibrationally excited ions

Electron ionization time‐of‐flight mass spectrometry: Historical review and current applications

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Dissociation of Molecules by Slow Electrons

Cited by 9 publications

References 288 publications

Resonant contributions to dissociation of H2by low-energy electron impact

Resonant contributions to dissociation of H2by low-energy electron impact

Dissociative recombination of N2+, O2+, and NO+: Rate coefficients for ground state and vibrationally excited ions

Electron ionization time‐of‐flight mass spectrometry: Historical review and current applications

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Product

Resources

About

Resonant contributions to dissociation of H₂by low-energy electron impact

Resonant contributions to dissociation of H₂by low-energy electron impact

Dissociative recombination of N₂⁺, O₂⁺, and NO⁺: Rate coefficients for ground state and vibrationally excited ions