Elastic and Inelastic Scattering of Low-Velocity H+ and H2+ in Hydrogen

Cramer, W. H.

doi:10.1063/1.1701225

Cited by 53 publications

(6 citation statements)

References 4 publications

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“…Previous measurements of the CT total cross section have been performed by Cramer [15], McClure [16], Gealy and Van Zyl [17], and Kusakabe et al [18]. While the total cross sections obtained in all these experiments are practically identical for E > 500 eV, discrepancies at low energies are noticeable.…”

mentioning

confidence: 82%

“…The CT process is thus described in the framework of the Franck-Condon approximation, where the target nuclei remain fixed during the collision. As the energy decreases below 1 keV, this [15]; (blue filled downward triangle) McClure [16]; (blue filled diamond) Gealy and Van Zyl [17]; (blue filled upward triangle) Kusakabe et al [18]. Recommended data: (red dash-dotted line) Phelps [19].…”

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confidence: 99%

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New Light Shed on Charge Transfer in FundamentalH++H2Collisions

et al. 2013

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There is no consensus on the magnitude and shape of the charge transfer cross section in low-energy H þ þ H 2 collisions, in spite of the fundamental importance of these collisions. Experiments have thus been carried out in the energy range 15 E 5000 eV. The measurements invalidate previous recommended data for E 200 eV and confirm the existence of a local maximum around 45 eV, which was predicted theoretically. Additionally, vibrationally resolved cross sections allow us to investigate the evolution of the underlying charge transfer mechanism as a function of E.

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confidence: 82%

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confidence: 99%

New Light Shed on Charge Transfer in FundamentalH++H2Collisions

et al. 2013

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“…Elizaga et al 15 also investigated electron capture in the same collisions using an eikonal treatment with the sudden approximation to describe target vibration and rotation. Although the sudden approximation is more accurate than the simple Franck-Condon (FC) approximation, it was found that it severely underestimates the capture cross section measured in the ion-beam-gas-cell 16,17 and crossed-beams experiments 18 for E < 200 eV. The origin of this failure was traced back 19 to the inability of the sudden approximation to represent the two-step quasiresonant mechanism, responsible for capture at low energies.…”

Section: Introductionmentioning

confidence: 98%

Influence of nuclear exchange on nonadiabatic electron processes in H$^+$++H$_2$2 collisions

Errea

Illescas

Macías

et al. 2010

The Journal of Chemical Physics

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H + +H 2 collisions are studied by means of a semiclassical approach that explicitly accounts for nuclear rearrangement channels in nonadiabatic electron processes. A set of classical trajectories is used to describe the nuclear motion, while the electronic degrees of freedom are treated quantum mechanically in terms of a three-state expansion of the collision wavefunction. We describe electron capture and vibrational excitation, which can also involve nuclear exchange and dissociation, in the E = 2-1000 eV impact energy range. We compare dynamical results obtained with two parametrizations of the potential energy surface of H + 3 ground electronic state. Total cross sections for E > 10 eV agree with previous results using a vibronic close-coupling expansion, and with experimental data for E < 10 eV. Additionally, some prototypical features of both nuclear and electron dynamics at low E are discussed.

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“…Figure 8, from S. K. Allison [8] and W. H. Cramer [9], shows measured values of the charge-exchange cross section <r cx for protons in hydrogen and its variation with energy. We use Ocx VH+/V 0 as the effective charge-exchange cross section and plot this quantity also in Fig.…”

Section: Evaluation Of Resultsmentioning

confidence: 99%

Plasma density measurements with a molecular beam

Kerr

1963

Nucl. Fusion

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Investigations of high-energy plasma require probing techniques that do not change the plasma characteristics. A molecular beam is such a probe for plasmas that have energetic electrons and cold ions. Attenuation of the beam is mainly by electron ionization, but other single-particle processes must be considered. A beam of hydrogen molecules is here used as the probe. That portion of the neutral beam that passes through the plasma is measured as a pressure by a specially designed differential manometer. The measured attenuation is then used to calculate plasma density using known values of the cross sections for the interactions between beam molecules and plasma electrons and ions.

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Elastic and Inelastic Scattering of Low-Velocity H+ and H2+ in Hydrogen

Cited by 53 publications

References 4 publications

New Light Shed on Charge Transfer in FundamentalH++H2Collisions

New Light Shed on Charge Transfer in FundamentalH++H2Collisions

Influence of nuclear exchange on nonadiabatic electron processes in H$^+$++H$_2$2 collisions

Plasma density measurements with a molecular beam

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