On the Photoelectron Spectrum of O<sup>2</sup>

Edqvist, O.; Lindholm, E.; Selin, L.E.; Åsbrink, L.

doi:10.1088/0031-8949/1/1/004

Cited by 262 publications

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“…In the He(II) photoelectron spectrum of O 2 obtained by Edqvist et al [12] at least two unassigned peaks of low intensity are detected between the B 2 Σ g -and the b 4 Σ g -states of O 2 . Recently, Jonathan et al [15], from the photo-electron spectrum of O 2 ( 1 ∆ g ), were able to observe the appearance of O 2 in the 2 ∆ g and the 2 Φ u states for which the molecular parameters are evaluated.…”

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confidence: 89%

“…Although the υ' = 6 level of the B 2 Σ g -state is observed in the photoelectron spectrum [12], no value of its ionization potential is given by Edqvist et al However, the intensity of the bands correspond-ing to the υ' = 5 and υ' = 6 levels represent 8.5% and 3.8% of the υ' = 1 transition. The low intensity of these transitions could be responsible for the lack of photoelectronphotoion coincidences for these levels.…”

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confidence: 99%

“…Danby and Eland [5] showed unequivocally that by photoionization of O 2 , the B 2 Σ g -state of O 2 is predissociated from υ' = 0 up to υ' = 5. However, the kinetic energy carried away by O + formed by predissociation of the υ' = 0 level of the B 2 Σ g -state is calculated at 783 meV (or 1566 meV total kinetic energy) using IP ad (O + 2 , B 2 Σ g -) = 20.296 eV [12] and the dissociation limit of O + 2 (X 2 Π g ) at 18.73 eV [7]. This interpretation is unable to explain the structure observed on the low energy side of the peak measured at 600 meV at 25 eV electron energy.…”

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confidence: 99%

“…Two submaxima are measured at 2536 meV and at 2740 meV and could be assigned to the predissociation of the υ' = 0 and υ' = 1 levels of the c 4 Σ u -state of O 2 + .The adiabatic ionization potential of the c 4 Σ u -state of O 2 + is measured at 24.577 eV by photoelectron spectroscopy [12]. The dissociation of O 2 + by process (3) is calculated at 22.06 eV [7].…”

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confidence: 99%

“…The dissociation of O 2 + by process (3) is calculated at 22.06 eV [7]. The total kinetic energy involved in the process, when produced by predissociation of the υ = 0 level of the c 4 Σ u -state is given by the energy difference between 24.577 eV [12] of the c 4 Σ u -(v' = 0) state and 22.055 eV [7], i.e., 2522 meV. This is in good agreement with the measured total kinetic energy of (2536 ± 30) meV.…”

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confidence: 99%

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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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confidence: 89%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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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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Excitation of CO+ and NO+ Electronic States Via Single-electron Capture by B2+ Ions

Lee

Leather

Brenton

1997

Rapid Commun. Mass Spectrom.

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High-resolution translational energy loss spectrometry was performed to obtain the spectra for single-electron capture by 6 keV B 2 + ions in collision with CO and NO molecules, to complement a previous investigation involving O 2 and N 2 targets. The spectrum for CO consists of eight well defined peaks, three of which correspond to capture into the ground state of CO + [X 2 Σ + ] dominated by the 0-0 molecular transition. One intense peak and a subsidiary one are identified as capture into the first excited electronic state of CO + , responsible for subsequent emission of the comet-tail system CO + [A 2 Π i → X 2 Σ + ]. The B 2 Σ + state of CO + , the upper electronic state of the Baldet-Johnson [B 2 Σ + → A 2 Σ i ] and the first negative [B 2 Σ + → X 2 Σ + ] bands, is also accessed through two capture channels. The NO spectrum exhibits one intense narrow peak dominated by capture into the second triplet state of NO + [b 3 Π], together with subsidiary features which may involve capture into the ground X 1 Σ + and excited singlet (A 1 Π, A' 1 Σ + , W 1 ∆) and triplet (b 3 Π, a 3 Σ + , b' 3 Σ -) manifolds. The NO spectrum is complicated by energy overlap of relevant capture channels, which makes unambiguous identification difficult.

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State‐Selected and State‐to‐State Ion‐Molecular Reaction Dynamics by Photoionization and Differential Reactivity Methods

1992

Advances in Chemical Physics

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On the Photoelectron Spectrum of O²

Cited by 262 publications

References 16 publications

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

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

Excitation of CO+ and NO+ Electronic States Via Single-electron Capture by B2+ Ions

State‐Selected and State‐to‐State Ion‐Molecular Reaction Dynamics by Photoionization and Differential Reactivity Methods

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On the Photoelectron Spectrum of O2

Cited by 262 publications

References 16 publications

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

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

Excitation of CO+ and NO+ Electronic States Via Single-electron Capture by B2+ Ions

State‐Selected and State‐to‐State Ion‐Molecular Reaction Dynamics by Photoionization and Differential Reactivity Methods

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On the Photoelectron Spectrum of O²