An improved value for the electron affinity of the negative hydrogen ion

Scherk, L.

doi:10.1139/p79-077

Cited by 38 publications

(26 citation statements)

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“…Studies on Lorentz stripping of the H 2 ion have been reported in several papers [2][3][4]. The rest-frame lifetime (t) of the H 2 ion in a magnetic field is given by Scherk [3] and Jason et al [4] as follows:…”

Section: Lorentz Stripping Of H 2 Ions and H 0 Atom Excited Statesmentioning

confidence: 99%

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H−charge-exchange injection without hazardous stripping foils

Yamane

1998

Phys. Rev. ST Accel. Beams

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A new scheme of H 2 charge-exchange injection without stripping foils is proposed. It is composed of a neutralizer of the H 2 beam using Lorentz stripping, the colliding system of a high power laser and the H 0 beam to excite H 0 atoms to the 3P state using the Rabi oscillation, and a magnet to strip the H 0 ͑3P͒ to a proton beam by Lorentz stripping. The necessary laser wavelength, laser power, magneticfield gradient, and maximum magnetic field are estimated for a beam energy from 1.0 to 3.0 GeV. The result shows that such a scheme is sufficiently feasible for H 2 beams with an energy discussed here.[S1098-4402(98)

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Section: Lorentz Stripping Of H 2 Ions and H 0 Atom Excited Statesmentioning

confidence: 99%

“…The rest-frame lifetime (t) of the H 2 ion in a magnetic field is given by Scherk [3] and Jason et al [4] as follows:…”

Section: Lorentz Stripping Of H 2 Ions and H 0 Atom Excited Statesmentioning

confidence: 99%

H−charge-exchange injection without hazardous stripping foils

Yamane

1998

Phys. Rev. ST Accel. Beams

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“…A negative ion, traversing a distance I in a region where there is a magnetic field B, has a probability to be stripped, and thus lost, given by [2,3] P = 1 -exp(-Z/Z,), '(1) where the stripping length with Al = 2.704 x cally I c< I,, and the stripping probability is small. kG-m, A2 = 149.j kG, and B is expressed in kG and I, in meter.…”

Section: The Spallation Neutron Sourcementioning

confidence: 99%

Negative-ion injection by charge exchange at 2.4 GeV

Ruggiero¹

1995

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The present technical note describes multi-turn injection by charge exchange of 2.4-GeV negative ions in a Accumulator Ring used as an intense Pulsed Spallation Neutron Source. The major concern of beam loss due to magnetic stripping of the negative ions is addressed. It is demonstrated that, despite the high energy of the ions and the limitation on the magnitude of the magnetic field, it is possible to control the amount of beam losses to a fractional value of better than loe5, as it is required to avoid latent activation of the accelerator components. The injection magnet system which accomplish this is described. The paper addresses also the concern of be& loss due to the 'same effect in the 2.4-GeV injector linear accelerator, and in the transport from the Linac to the Accumulator Ring.

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“…4 Greater accuracy was then achieved by Chupka, Dehmer, and Jivery 5 giving 6083͑ϩ11,Ϫ3͒ cm Ϫ1 . In 1979, Scherk 6 reported a value of 6085.5Ϯ3.3 cm Ϫ1 . Then in 1991, Lykke, Murray, and Lineberger 7 achieved a 20-fold improvement in accuracy obtaining 6082.99Ϯ0.…”

Section: Introductionmentioning

confidence: 99%

Electron affinity of hydrogen, deuterium, and tritium: A nonadiabatic variational calculation using explicitly correlated Gaussian basis functions

Kinghorn

Adamowicz

1997

The Journal of Chemical Physics

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Articles you may be interested inAn algorithm for nonrelativistic quantum-mechanical finite-nuclear-mass variational calculations of nitrogen atom in L = 0, M = 0 states using all-electrons explicitly correlated Gaussian basis functions An algorithm for quantum mechanical finite-nuclear-mass variational calculations of atoms with L = 3 using allelectron explicitly correlated Gaussian basis functions J. Chem. Phys. 138, 104107 (2013); 10.1063/1.4794192 Molecular structure calculations: A unified quantum mechanical description of electrons and nuclei using explicitly correlated Gaussian functions and the global vector representation Electron affinity of Li 7 calculated with the inclusion of nuclear motion and relativistic corrections Nonadiabatic variational calculations for the anion ground state energies, mass shifts, and electron affinities of Hydrogen, Deuterium and Tritium are reported. Electron affinities values are 6083.0994, 6086.7137, and 6087.9168 cm Ϫ1 for Hydrogen, Deuterium, and Tritium, respectively. These results were obtained using a basis of explicitly correlated Gaussians. Exact nonrelativistic energy bounds are carefully predicted: E(H Ϫ )ϭϪ0.5 274 458 811, E(D Ϫ )ϭϪ0.5 275 983 247, and E(T Ϫ )ϭϪ0.5 276 490 482 in hartree energy units. It is shown that these new bounds cannot be obtained using the infinite nuclear mass approximation plus Rydberg scaling and the usual first order mass polarization correction.

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An improved value for the electron affinity of the negative hydrogen ion

Abstract: An expression is derived for the lifetime of a negative ion in a weak and static electric field. Using this expression, existing experimental data are analyzed to improve the empirical value of the electron affinity of the negative hydrogen ion by an order of magnitude.

Cited by 38 publications

References 1 publication

H−charge-exchange injection without hazardous stripping foils

H−charge-exchange injection without hazardous stripping foils

Negative-ion injection by charge exchange at 2.4 GeV

Electron affinity of hydrogen, deuterium, and tritium: A nonadiabatic variational calculation using explicitly correlated Gaussian basis functions

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