Variational Calculation of the Scattering of Electrons of Nearly Zero Energy by Hydrogen Atoms

Borowitz, Sidney; Greenberg, Howard E.

doi:10.1103/physrev.108.716

Cited by 22 publications

(3 citation statements)

References 9 publications

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“…As the thermal velocity for a weakly coupled plasma is relatively much higher than the velocity of the projectile that we consider here (extremely low), it is legitimate to use the Debye potential (1) than the dynamic interaction potential (2). Under the influence of no external environment the problem of low-energy electronhydrogen collisions has been extensively investigated by many authors with various degrees of sophistication [11][12][13][14][15][16][17][18][19][20][21][22][23] (and further references therein) and the scattering length has been calculated very accurately [12,14,23]. But in a plasma environment, to the best of our knowledge, the problem of low-energy collisions has not been investigated so far.…”

Section: Introductionmentioning

confidence: 99%

Scattering of slow electrons by hydrogen atoms in weakly coupled Debye plasmas

Ghoshal¹,

2010

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

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An effective range theory is used to study the elastic scattering of electrons by the ground state of hydrogen atoms in weakly coupled plasma environments for low electron energies. The plasma screening effect is represented by screened Coulomb potentials (SCPs) of Debye type. Highly correlated and variationally determined wavefunctions for H− in plasmas are used to determine the effective range of the ion states. The results for S-wave singlet phase shifts for the incident electron momentum in the range [0, 0.75] au are reported, to the best of our knowledge, for the first time in the literature. For the unscreened case, our reported results are in good agreement with some of the most accurate results available in the literature.

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Section: Introductionmentioning

confidence: 99%

Scattering of slow electrons by hydrogen atoms in weakly coupled Debye plasmas

Ghoshal¹,

2010

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

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“…(4) Now the scattering length is a zero-energy property of the system and has been calculated by a variety of researchers for e-H scattering. 3 > 6 ' 7,8 While the numerical values of their results are not in complete agreement, they all predict that the singlet and triplet scattering lengths are both positive. It is well known that the scattering length is negative for a system with no bound states, and becomes positive for a system with a bound state near zero energy.…”

Section: C0llection Of Ions Produced By a Particles In Air 143mentioning

confidence: 94%

“…Our results in no way contradict those of Kimura et at. 7 or those of Alder, Huber, and Metzger, 8 who, while they do not challenge the validity of the usual extrapolation methods, state that very large collecting fields are necessary to prevent significant recombination of ions in air.…”

Section: Methodsmentioning

confidence: 99%

Collection of Ions Produced by Alpha Particles in Air

Bay

Seliger

1960

Phys. Rev.

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In the measurement of the ionization caused by alpha particles in air, recombination effects between slowly moving positive and negative ions (the latter formed by electron attachment to oxygen) have to be considered. The usual procedure in such measurements is to determine the saturation current (by extrapolation of reciprocal current versus reciprocal voltage curves to infinite field strength) according to the Jaffe theory. A paper by Wingate, Gross, and Failla has cast doubt on the validity of this extrapolation technique, in that the authors propose a field-independent part of the recombination amounting to 3.3% at atmospheric pressure in air. This proposal implied that all previous measurements of W a for air were in error by this amount and that this error is a possible cause for the reported difference (3-4%) between W values for alpha and beta particles in air. In view of our own W measurements we felt compelled to reexamine this supposedly field-independent part of the recombination. Approximating the experimental conditions of Wingate, Gross, and Failla we have not been able to reproduce their effect and our experiments demonstrate the validity of the usual extrapolation techniques.

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Atomic Collisions Involving Low Energy Electrons and Ions

Biondi

1963

Advances in Electronics and Electron Physics Volume 18

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Variational Calculation of the Scattering of Electrons of Nearly Zero Energy by Hydrogen Atoms

Cited by 22 publications

References 9 publications

Scattering of slow electrons by hydrogen atoms in weakly coupled Debye plasmas

Scattering of slow electrons by hydrogen atoms in weakly coupled Debye plasmas

Collection of Ions Produced by Alpha Particles in Air

Atomic Collisions Involving Low Energy Electrons and Ions

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