Simultaneous excitation-detachment functions for the electron-negative hydrogen ion collisions near the threshold

Grujić, Petar; Koledin, D.

doi:10.1007/bf01429282

“…We note in passing that H − has no singly excited states. Also, process (ii), which in the case of H − requires a special treatment, has also been examined within the classical theory (Grujić and Koledin 1989). Kazansky and Taulbjerg (1996); (e) Ostrovsky and Taulbjerg (1996).…”

Section: The Quasiclassical Modelmentioning

confidence: 99%

detachment function: I. The classical-dynamic study

Grujić

¹

,

Simonović

²

1998

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

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We investigate the process e + H − → H + 2e at low impact energies. A (quasi)classical model for the hydrogen negative ion has been used, and the system potential function which describes the three-body force has been employed. Using the classical trajectory method we calculate the detachment function from the (classical) threshold up to 20 eV of the impact energy. The cross section evaluated within the plane two-dimensional model follows roughly the shape of the recent experimental data, but appears lower than the experimental cross section close to the threshold and lies between the latest and some of the earlier measured values at higher energies. The mechanism of the detachment process close to the threshold has been investigated in detail and some particular features of the energy, mutual angle and angular momenta distributions are discussed.

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“…We note in passing that H − has no singly excited states. Also, process (ii), which in the case of H − requires a special treatment, has also been examined within the classical theory (Grujić and Koledin 1989). Cherkani et al (1996); (d) Kazansky and Taulbjerg (1996); (e) Ostrovsky and Taulbjerg (1996).…”

Section: The Quasiclassical Modelmentioning

confidence: 99%

“…However, these neglected terms are of marginal importance for the problem at hand. The dipole polarization term disappears only at the Wannier ridge (r 12 = −r 23 , so-called leading configuration, see, e.g., Grujić and Koledin (1989)), whose disappearance has no practical consequence on numerical calculations. However, in the hydrogen atom ground state case the quadrupole polarizability is zero itself and the dominance of the dipole polarization potential is further promoted.…”

Section: Two-electron Systemmentioning

confidence: 99%

Metallurgical Studies and Optimization of Critical Crrent Density in Bi–(Pb)–Sr–Ca–Cu–O Superconductors

Sekine

¹

,

Ogawa

²

,

Inoue

³

et al. 1989

Jpn. J. Appl. Phys.

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We investigate the process e + H − → H + 2e at low impact energies. A (quasi)classical model for the hydrogen negative ion has been used, and the system potential function which describes the three-body force has been employed. Using the classical trajectory method we calculate the detachment function from the (classical) threshold up to 20 eV of the impact energy. The cross section evaluated within the plane two-dimensional model follows roughly the shape of the recent experimental data, but appears lower than the experimental cross section close to the threshold and lies between the latest and some of the earlier measured values at higher energies. The mechanism of the detachment process close to the threshold has been investigated in detail and some particular features of the energy, mutual angle and angular momenta distributions are discussed.

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Fourfold ionization by electrons near the threshold

Dimitrijević

¹

,

Grujić

²

,

Simonović

³

1990

Z Phys D - Atoms, Molecules and Clusters

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Threshold law for the process e + A q + --. A (q + 4) + + 5 e has been derived within the classical theory. For neutral targets (q = 0) the threshold exponent assumes value 5.08, consistent with previous calculations for ionizations of lower orders. The method fails for q < -4. The results are compared with recent experimental measurements, which considerably underestimate theoretical findings. An empirical formula for n-fold ionization is provided, which predicts values for the threshold exponent ~c= 7.8 and 12.5 for n = 5, 6 respectively.

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Simultaneous excitation-detachment functions for the electron-negative hydrogen ion collisions near the threshold

Cited by 5 publications

References 10 publications

detachment function: I. The classical-dynamic study

detachment function: I. The classical-dynamic study

Metallurgical Studies and Optimization of Critical Crrent Density in Bi–(Pb)–Sr–Ca–Cu–O Superconductors

Fourfold ionization by electrons near the threshold

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