Cross Sections and Electron Affinity for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>Ions From<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>, CO, and

Schulz, Günther

doi:10.1103/physrev.128.178

Cited by 204 publications

(40 citation statements)

References 20 publications

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“…These cross sections were compared with those deduced from the beam experiments of Craggs and Tozer (1960), the calculations being carried out for Maxwellian and Druyvesteyn distributions of velocities. More recently swarm measurements of ionization and attachment coefficients have been conducted by Schlumbohm (1962), while further beam experiments have been carried out by Schulz (1962) and by Asundi, Craggs, and Kurepa (1963). The agreement between the results obtained by Schulz and by Asundi, Craggs, and Kurepa is good, both for the electron energies at which the cross sections are at a maximum and for the magnitudes of these maxima.…”

Section: Attachment Cross Sectionsmentioning

confidence: 74%

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Measurements of Townsend's Energy Factor k1 for Electrons in Carbon Dioxide

Rees¹

1964

Aust. J. Phys.

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SummaryValues of Townsend's energy factor kl for electrons in carbon dioxide have been determined as a function of the parameter E/p for 0·1 .;;; E/p .;;; 50 at a temperature of 293°K. The results are compared with those of other investigators and are used in a recomparison of the cross sections for electron attachment deduced from swarm and beam types of experiments for swarms of electrons having mean energies of up to 5 eV.

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Section: Attachment Cross Sectionsmentioning

confidence: 74%

“…Curve D, beam data of Asundi, Craggs, and Kurepa (1963). Curve E, beam data of Schulz (1962). Curve F, beam data of Craggs and Tozer (1960).…”

Section: -mentioning

confidence: 99%

Measurements of Townsend's Energy Factor k1 for Electrons in Carbon Dioxide

Rees¹

1964

Aust. J. Phys.

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“…-. This process has been frequently studied by many authors [1][2][3][4][5] . Some of these used as a calibration of the energy scale the attachment peak of SF 6 -considered as a zero electron-energy process 5 .…”

Section: (C) Kinetic Energy Discrimination Of Negative Ionsmentioning

confidence: 99%

Mass spectrometric study of dissociative attachment in diatomic molecules. I. CO and H2

Locht

Momigny

1969

International Journal of Mass Spectrometry and Ion Physics

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A study of the shape of the DA peaks leads to a general method for the determination of the threshold of a DA process. In order to test this method, the negative ions appearing in CO and H 2 have been investigated, using a sector field instrument. An attempt has been made to establish the relative positions of the potential energy curves (using the Morse function) for the electronic states involved in the processes observed.

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“…In light of its fundamental importance to the understanding of such processes, it is noteworthy that the electronic structure of CO 2 and its metastable anions has not been completely characterized. Most of the extant literature on low-energy electron-CO 2 scattering deals with the short-lived 2 Π u shape resonance near 4 eV, which provides the dominant mechanism for vibrational excitation, while experimental studies of DEA to CO 2 [8][9][10][11][12][13][14] have focused mainly on total cross sections and their dependence on electron energy and ion kinetic energy release. The 2 Π u resonance also feeds the CO( 1 Σ + ) + O − ( 2 P) DEA channel whose thermodynamic threshold lies at 3.99 eV.…”

mentioning

confidence: 99%

Dissociative electron attachment to carbon dioxide via the 8.2 eV Feshbach resonance

Slaughter

Adaniya

Rescigno

et al. 2011

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

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Momentum imaging experiments on dissociative electron attachment (DEA) to CO2 are combined with the results of ab initio calculations to provide a detailed and consistent picture of the dissociation dynamics through the 8.2 eV resonance, which is the major channel for DEA in CO2. The present study resolves several puzzling misconceptions about this system. PACS numbers: 34.80.HtNegative ion resonances are ubiquitous in low-energy electron-molecule collisions and provide an efficient vehicle for the transfer of electronic energy to nuclear motion either through vibrational excitation or dissociative electron attachment, the latter process resulting in the formation of both charged and neutral fragments. Recent dynamical studies [1] have shown that DEA to fundamental polyatomic systems can exhibit complex electronic and nuclear dynamics involving symmetry breaking target deformations [2] and, in some cases, conical intersections [3,4]. Mechanistic studies of the DEA process may give insight into their behavior in the condensed phase [5] and in biological environments [6].Carbon dioxide offers an interesting case in point. The inverse of DEA to CO 2 , i.e. associative detachment, is thought to be important in the catalytic oxidation of CO on a metal surface [7]. In light of its fundamental importance to the understanding of such processes, it is noteworthy that the electronic structure of CO 2 and its metastable anions has not been completely characterized. Most of the extant literature on low-energy electron-CO 2 scattering deals with the short-lived 2 Π u shape resonance near 4 eV, which provides the dominant mechanism for vibrational excitation, while experimental studies of DEA to CO 2 [8][9][10][11][12][13][14] have focused mainly on total cross sections and their dependence on electron energy and ion kinetic energy release. The 2 Π u resonance also feeds the CO( 1 Σ + ) + O − ( 2 P) DEA channel whose thermodynamic threshold lies at 3.99 eV. Scattering calculations [15] show that the 2 Π u resonance becomes sharper and finally electronically bound as the CO bonds are increased along the symmetric stretching coordinate. It is also known that the CO − 2 ion becomes stable upon bending. It was a long-held belief [16][17][18] [5,21], the 2 Π u resonance accounts for the other two states, then we are led to the puzzle whose resolution is a subject of this Letter. The dominant DEA channel in CO 2 is observed at 8.2 eV. Since this energy is less than the 10.0 eV required to produce electronically excited CO* + O − , the 8.2 eV resonance must necessarily result in electronic ground-state products. So how is this possible when, according to current thinking, all three states arising from this asymptote have already been accounted for? The early theoretical work of Claydon et al.[21] and England et al. [22] assigned the 8.2 eV peak to a 2 Σ + g shape resonance. This assignment has since been disputed. Srivastava and Orient [13], having found little or no dependence of the 8.2 eV DEA peak on vibrational excitation of the...

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Cross Sections and Electron Affinity forO−Ions FromO2, CO, and

Cited by 204 publications

References 20 publications

Measurements of Townsend's Energy Factor k1 for Electrons in Carbon Dioxide

Measurements of Townsend's Energy Factor k1 for Electrons in Carbon Dioxide

Mass spectrometric study of dissociative attachment in diatomic molecules. I. CO and H2

Dissociative electron attachment to carbon dioxide via the 8.2 eV Feshbach resonance

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