Translational spectroscopy of the unimolecular dissociation N+2 → N+ + N

Fournier, P.; Govers, T.R.; Runstraat, C.A. van de; Schopman, Joop; Los, J.

doi:10.1051/jphys:01972003308-9075500

Cited by 26 publications

(15 citation statements)

References 14 publications

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“…Superimposed on the C 2 Σ u + state, other structures not yet interpreted have been found in two previous papers [7,26] and in the present work. The position of these structures have been listed in table 2 between brackets.…”

Section: 12supporting

confidence: 51%

“…In the fifth column of table 2 are listed the total kinetic energy values (i.e., twice the measured values) which could be directly correlated with spectroscopic data. In the same table 2 the most significant previously published results [6,7,24] are collected.…”

Section: Kinetic Energy Measurementsmentioning

confidence: 66%

“…In both experiments a pronounced discrete structure was observed and ascribed to the predissociation of the C 2 Σ u + state of N 2 + [6]. In the unimolecular dissociation experiment [7] an additional structure and a strong isotope effect were observed. No definite interpretation was found for the additional structure [7].…”

Section: Introductionmentioning

confidence: 76%

“…In the unimolecular dissociation experiment [7] an additional structure and a strong isotope effect were observed. No definite interpretation was found for the additional structure [7]. The radiative decay of the C 2 Σ u + state of N 2 + through predissociation has been studied experimentally by Van de Runstraat [8] as well as theoretically by Lorquet [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Schopman et al [6,7] analysed under high resolution the laboratory velocity distribution of the N + fragments formed by the impact of a 10 keV N 2 + beam on He [6] and at a residual gas pressure [7]. In both experiments a pronounced discrete structure was observed and ascribed to the predissociation of the C 2 Σ u + state of N 2 + [6].…”

Section: Introductionmentioning

confidence: 99%

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The dissociative ionization of nitrogen

et al. 1975

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Energy distributions and appearance potentials of N ions produced by low-energy electron impact on N2 have been measured. At least five dissociation limits were detected either directly in the ionization efficiency curves of N or by extrapolation of the 1/2 slope straight lines drawn through the kinetic energy versus appearance potential energy diagram. Fine structure observed at low ion energy has been interpreted by the predissociation of at least two N 2 excited states one of which being the well-known C 2 Σ u + state. One of the others could be a 2 Π u state pre-dissociated to the dissociation limit at 24.34 eV. Close correlation between the results of the present work and photoelectron spectroscopic observations could be done over the electron energy range between 24.3 eV and 36 eV and assignments are discussed in detail.

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Section: 12supporting

confidence: 51%

Section: Kinetic Energy Measurementsmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The dissociative ionization of nitrogen

et al. 1975

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Collision-Induced Dissociation of Diatomic Ions

Los

Govers

1978

Collision Spectroscopy

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The observation of predissociations in the oxygen molecular ion by low-energy electron impact

Schopman

Locht

1974

Chemical Physics Letters

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The kinetic energy distribution of the O + ions formed by dissociative ionization of O2 has been carefully ex-amined in the range of 0.0 to 1.3 eV. In the peak at 600 meV fine structure is observed and interpreted by predissociation. The high energy side of the peak has been ascribed to the predissociation of the 2 ∆ g , B 2 Σ g -and the c 4 Σ u -states of O 2 + . The low energy side of the peak is presumably due to the predissociation of the b 4 Σ g -state or the Φ u state of O 2 + or to autoionizing predissociation.During the last few years much attention has been paid to the dissociation of diatomic molecules. One of the dissociation channels a molecule can choose is the predissociation observed in several neutral and ionized species. Besides the optical spectroscopy methods, predissociations have been investigated by a variety of techniques such as "metastable ion" mass spectrometry [1,2], high resolution translational spectroscopy [3,4] as well as photoelectron spectroscopy [5,6].The dissociation of the oxygen molecular ion has been the subject of several papers. Doolittle et al. [7] obtained the kinetic energy distribution curve of O + from O 2 by using photoionization mass spectrometry. Freund [8] and Kieffer et al. [9] studied the kinetic energy carried away by the 0 ions formed by electron impact on O 2 . These authors ascribed the first broad and structureless peak, with a maximum at 850 meV, to O + fragment ions formed by predissociation, although no direct experimental evidence was found for this mechanism. Recently Danby and Eland [5] showed experimentally the existence of a predissociation of O 2 by using the photoelectronphotoion coincidence technique.The purpose of this paper is to report our results obtained for the kinetic energy analysis of the O + ions formed by electron impact on molecular oxygen;The instrument used, as well as the experimental conditions will be described elsewhere [10]. Briefly, the ions formed in a conventional Nier-type ion source pass through a retarding potential system before entering into a quadrupole mass spectrometer. The ion current is, at fixed electron energy, continuously scanned with respect to the retarding potential or with respect to electron energy at fixed retarding potential. The first derivative of either the retarding curves or the ionization efficiency curves is stored in a multichannel analyser and plotted on an X-Y recorder.A preliminary report [11] has been devoted to the kinetic energy distribution curve of O + from O 2 , spread over a broad energy range (0 to 12 eV). These results will be published elsewhere [10]. In this letter we will limit our discussion to the results obtained in the energy range of 0 to 1.3 eV.An example of a kinetic energy distribution of O + from O 2 , as observed by the impact of 25 eV electrons, is shown in fig. 1.The first peak maximum is measured at 0.0 eV coinciding with the maximum of the thermal distribution of the molecular ion O 2 , taken as the origin of the kinetic energy scale. The second maximum, meas...

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Translational spectroscopy of the unimolecular dissociation N+2 → N+ + N

Cited by 26 publications

References 14 publications

The dissociative ionization of nitrogen

The dissociative ionization of nitrogen

Collision-Induced Dissociation of Diatomic Ions

The observation of predissociations in the oxygen molecular ion by low-energy electron impact

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