Strong similarities between small cluster anions and electrons colliding with argon

Jalbert, Ginette; Silva, Livia; Wolff, W.; Magalhães, S.D.; Medina, Aline; Sant’Anna, M. M.; Faria, N. V. de Castro

doi:10.1103/physreva.74.042703

Cited by 6 publications

(11 citation statements)

References 30 publications

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“…We must stress that for other target systems, e.g., He, Ne, Ar, our model provides an excellent agreement with the experimental total detachment cross sections for various anion projectiles [8,9]. As noted in the present work, the same is not true for the case of N 2 and this may be associated with the fact that we are not able to account completely for the effect of the N 2 shape resonance.…”

Section: Discussionsupporting

confidence: 64%

“…Different from what has been obtained earlier [8,9] in order to describe electron detachment in collisions between atoms with atomic and molecular anions, the quantitative agreement between the theoretical cross sections and the experimental ones does not occur when a constant contribution coming from the core is added. However, we have reproduced satisfactorily well the experimental results for CN − and O − 2 with an adapted model from the previous ones.…”

Section: Discussioncontrasting

confidence: 57%

“…[8,9]) have shown that the detachment mechanism has a simple underlying structure, both concerning the projectile and the target dependencies. In fact, it was shown that cross-section curves for electron scattering and negative ion detachment during collisions on rare gas or molecules present similar velocity dependencies.…”

Section: Modelmentioning

confidence: 97%

“…[7][8][9] and references therein), in the range from intermediate to high impact velocities. In fact, we developed a method of measuring cross sections of electron detachment in the case of atomic anions and destruction cross sections in the case of molecular or cluster anions.…”

Section: Introductionmentioning

confidence: 96%

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Electron-detachment cross section forCN−andO2−incident on N2at intermediate velocities

et al. 2014

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The electron-detachment cross section was measured for the molecular negative ions CN − and O − 2 incident on N 2 , in the 0.08-1.2 a.u. velocity region. Our setup uses the gas stripper of a tandem accelerator as a gas chamber. All cross sections present a maximum near 0.4 a.u., a velocity corresponding to the well-known shape-resonance that appears in the electron-N 2 collisions. A semiclassical model is employed to analyze the data. The role of this shape resonance is discussed in this article.

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Section: Discussionsupporting

confidence: 64%

Section: Discussioncontrasting

confidence: 57%

Section: Modelmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 96%

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Electron-detachment cross section forCN−andO2−incident on N2at intermediate velocities

et al. 2014

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“…Details about the method and our experimental setup were given in previous publications [31][32][33][34][35][36][37], and only the main features are described here. The method is based on the use of the high-voltage terminal as the collision chamber, with the collision target being what is traditionally used only as a gas stripper to produce positive ions and neutral species at the second stage of the accelerator.…”

Section: B Measurement Of Total Detachment Cross Sectionmentioning

confidence: 99%

Total detachment cross sections of C−, CH−, C2−, and C
Nascimento
¹
,
Mello
²
,
Magnani
³

et al. 2013
Phys. Rev. A
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We have measured the total electron detachment cross sections of the negative ions C − , CH − , C − 2 , and C 2 H − incident on molecular nitrogen in the velocity range 0.22-0.56 a.u. The data were measured with reliable normalization and, particularly in the critical case of the C − projectile, the absence of beam contamination due to long-lived metastable states. Comparison of all measurements of cross sections with experimental data for other projectiles shows a common velocity dependence with a maximum near 0.4 a.u. This behavior suggests a connection between the anion-N 2 electron-loss collision dynamics and that of the shape-resonance process dominant in low-velocity electron-N 2 total electron scattering.

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Negative ions and their behavior in collisions

Faria

Sant’Anna

Carvalho

et al. 2011

Int J of Quantum Chemistry

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We present a review of electron detachment cross sections of atomic, molecular, and cluster anionic projectiles colliding with atoms and molecules, the main focus being on reporting systematic experimental studies. These studies use an experimental method developed at our laboratory, which uses the gas cell of standard tandem accelerators as a collision target. The experimental data show that the velocity dependence of electron detachment cross sections can be described modeling negative ions as a quasi-free electron bound to a neutral core. Using this model, a velocityindependent contribution to cross sections is associated with the neutral projectile core, while a velocity-dependent curve is associated to the projectile quasi-free electron. This latter curve is the convolution of experimental free-electron cross sections, for the same target, with the momentum distribution of the quasi-free projectile electron. This model is useful to obtain cross section estimates, as exemplified by its application in several collision systems relevant for inertial fusion and plasma diagnostics. It is also a powerful tool for verifying the accuracy of anion structure calculations.

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Strong similarities between small cluster anions and electrons colliding with argon

Cited by 6 publications

References 30 publications

Electron-detachment cross section forCN−andO2−incident on N2at intermediate velocities

Electron-detachment cross section forCN−andO2−incident on N2at intermediate velocities

Total detachment cross sections of C−, CH−, C2−, and C
Nascimento
¹
,
Mello
²
,
Magnani
³

et al. 2013
Phys. Rev. A
Self Cite
8
0
1
0
View full text Add to dashboard Cite

Negative ions and their behavior in collisions

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Strong similarities between small cluster anions and electrons colliding with argon

Cited by 6 publications

References 30 publications

Electron-detachment cross section forCN−andO2−incident on N2at intermediate velocities

Electron-detachment cross section forCN−andO2−incident on N2at intermediate velocities

Total detachment cross sections of C−, CH−, C2−, and CNascimento1, Mello2, Magnani3 et al. 2013Phys. Rev. ASelf Cite8010View full textAdd to dashboardCite

Negative ions and their behavior in collisions

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About

Total detachment cross sections of C−, CH−, C2−, and C
Nascimento
¹
,
Mello
²
,
Magnani
³

et al. 2013
Phys. Rev. A
Self Cite
8
0
1
0
View full text Add to dashboard Cite