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Rosén, Stefan; Peverall, R.; Horst, Julian; Sundström, Gerdt; Semaniak, J.; Sundqvist, Olof; Larsson, Mats; Wilde, M. De; Zande, Wim J. van der

doi:10.1023/a:1012669210336

Cited by 8 publications

(3 citation statements)

References 9 publications

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“…In the CRYRING 28 experiment, kT ⊥ = 0.01 eV and kT = 0.0001 eV. 29 At ASTRID, 26 the temperatures were 0.02 eV and 0.001 eV, respectively. In the following discussion, we take kT = 0.0 eV.…”

Section: Electron Velocity Distributionmentioning

confidence: 98%

The vibrational dependence of dissociative recombination: Cross sections for ${\rm N}_2^ +$N2+

Guberman¹

2013

The Journal of Chemical Physics

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Theoretical ab initio calculations are reported of the cross sections for dissociative recombination of the lowest four excited vibrational levels of N2(+) at electron energies from 0.001 to 1.0 eV. Rydberg vibrational levels contributing to the cross section structures are identified as are dissociative channels contributing more than 10(-16) cm(2) to the total cross sections. In contrast to the prior study of v = 0 (S. L. Guberman, J. Chem. Phys. 137, 074309 (2012)), which showed 2(3)Πu to be the dominant dissociative channel, 4(3)Πu is dominant for v = 1. Both 2 and 4(3)Πu are major routes for dissociative recombination from v = 2-4. Other routes including 2(3)Σu(+), 3(3)Πu, 2(1)Πu, 2(3)Πg, 2(1)Σg(+), 1(1)Δg, and b('1)Σu(+) are significant in narrow energy ranges. The results show that minor dissociative routes, included here for N2(+), must be included in theoretical studies of other molecular ions (including the simplest ions H2(+) and H3(+)) if cross section agreement is to be found with future high resolution dissociative recombination experiments. The calculated predissociation lifetimes of the Rydberg resonances are used in a detailed comparison to two prior storage ring experiments in order to determine if the prior assumption of isotropic atomic angular distributions at "zero" electron energy is justified. The prior experimental assumption of comparable cross sections for v = 0-3 is shown to be the case at "zero" but not at nonzero electron energies. Circumstances are identified in which indirect recombination may be visualized as a firefly effect.

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Section: Electron Velocity Distributionmentioning

confidence: 98%

The vibrational dependence of dissociative recombination: Cross sections for ${\rm N}_2^ +$N2+

Guberman¹

2013

The Journal of Chemical Physics

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“…1). The imaging detector used in this experiment consists of three stacked microchannel plates (MCPs) and a phosphor screen (size F 77 mm) and is similar in design to that of Amitay and Zajfman [8] and Rosén et al [9]. Fragment atoms from the DR of H 2 O 1 strike the MCPs detector and generate flashes on a phosphor screen.…”

Section: (Received 5 September 2000)mentioning

confidence: 99%

Dynamics of Three-Body Breakup in Dissociative Recombination:H2O+

et al. 2000

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To better understand the propensity for the three-body breakup in dissociative recombination (DR) of dihydrides ( H(3)(+), NH(2)(+), CH(2)(+), and H(2)O(+)), we undertook a study of the dynamics of this process. A study of DR of H(2)O(+) to give O + H + H was carried out at the CRYRING Heavy-Ion Storage Ring in Stockholm. With the stored beam energy of 4.5 MeV, we separated the O signal from the H signals with a differential absorber, thus reducing the problem to a sum of two two-body problems. Results included (1) the ratio of O((3)P) to O((1)D) product, (2) the distribution of recoil-kinetic energy between the two hydrogen atoms, (3) the angular distribution between the hydrogen atoms in the O((3)P) channel and in the O((1)D) channel.

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“…In the electron-interaction region, the superelastic collisions and the DR reactions take place. Neutral products are detected by an ion implanted silicon detector (IISD) or on the ID [11]. The IISD is used for the determination of the DR rate, whereas the ID is used for obtaining information on the vibrational distribution of the ion beam.…”

mentioning

confidence: 99%

Rotational State Effects in the Dissociative Recombination ofH2+

et al. 2007

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We have studied the dissociative recombination (DR) of molecular hydrogen ions with slow electrons over a range of collision energies from 0 to 400 meV. By employing a pulsed expansion source for rotational cooling and by exploiting super elastic collisions with near-0-eV electrons in a heavy ion storage ring for vibrational cooling, we observe a highly structured DR cross section, comparable to that reported for HD+. Using para-hydrogen-enriched ion beams, we identify for the first time features in the DR cross sections attributed to nu=0, J=even molecules (para-H2) and nu=0, J=odd (ortho-H2) molecules, separately. Indications are given that para levels have different DR rate coefficients from ortho levels for the first four vibrational levels at near-0-eV collisions.

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Untitled

Cited by 8 publications

References 9 publications

The vibrational dependence of dissociative recombination: Cross sections for ${\rm N}_2^ +$N2+

The vibrational dependence of dissociative recombination: Cross sections for ${\rm N}_2^ +$N2+

Dynamics of Three-Body Breakup in Dissociative Recombination:H2O+

Rotational State Effects in the Dissociative Recombination ofH2+

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