Ionization of Helium, Neon, and Nitrogen by Helium Atoms

Hayden, Howard C.; Utterback, N. G.

doi:10.1103/physrev.135.a1575

Cited by 121 publications

(45 citation statements)

References 18 publications

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“…An estimate of j i (0) can be obtained from the relations [9] ( ) ( ) ( ) where n i and υ i are, respectively, the ion density and drift velocity; ε 0 is the dielectric constant, and A is a constant, which is equal to 2. Table 1.…”

Section: Resultsmentioning

confidence: 99%

Modes of generation of the optical properties of a moderate-pressure nanosecond discharge with a slit cathode in argon

et al. 2009

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The spatial distribution of the optical radiation of the plasma in a discharge gap and inside the cathode cavity was experimentally investigated for a nanosecond transverse electrical discharge with a slit cathode in argon at moderate pressures. For the conditions investigated, estimates of the factor γ c have been obtained and the free paths of accelerated electrons in the plasma have been determined. It has been revealed that the structure of the optical radiation of a nanosecond discharge with a slit cathode is related to the features of the fast electron energy relaxation.

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Section: Resultsmentioning

confidence: 99%

Modes of generation of the optical properties of a moderate-pressure nanosecond discharge with a slit cathode in argon

et al. 2009

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“…This explains wk; we had some difficulties in detecting ions produced by the collision. Furthermore it should be noticed that the detector may not have the same efficiency for different scattered particles (metastables, ions and ground-state neutrals) at energy lower than 1 keV (Hayden andUtterback 1964, Morgenstern et al 1973). However assuming that the parity is conserved in the one-electron reaction (4), the excited levels of helium would be in triplet states and radiative cascade decays would occur populating exclusively the 23S metastable state.…”

Section: Experimental Techniquementioning

confidence: 99%

Imprinted Pattern Profile-Dependent Optical Properties of Metal Nanostructures

Choi¹,

Park²,

Lee³

et al. 2012

Jpn. J. Appl. Phys.

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Collisions of He(2'S) on atomic (He, Ar) or molecular (D2, 0,) targets are experimentally investigated at low keV energies (0.1-1.5 keV) by a time-of-flight technique. This method yields an overall picture of the various inelastic processes and their relative probabilities. Direct experimental evidence of the importance of the He(23P) and He(n'l') n ' s 3 excitations of the projectile with He and D, targets is reported. With an 0, target differential cross sections for He+ production measured at various energies reveal a rainbow feature. With the Ar target, the predominance of Penning ionisation and excitation transfer processes is confirmed. The experimental results concerning the He*-He system have been compared with the predictions of available theoretical models: the important He(2'P) production is qualitatively in agreement with calculations based on the c 'Xl-b' 'n, rotational coupling. The covalent-ionic transition in the He, molecule is proposed as a primary mechanism which can account for the Rydberg He(nl) population. For the other targets the possibility of connecting those Rydberg excitations with the existence of a transient ionic complex (He*-T-) is examined.

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“…(3) Laboratory experiments on secondary electron yields arising from alkali metal ions impacting on aluminum oxidized surfaces show that significant numbers of secondary electrons are emitted for potentials above a threshold of 200V and that the yield reaches 0.5 electrons per impacting ion at 400 V (Dietz and Sheffield, 1975 (Szapiro et al, 1988 ;Sxapiro and Rocca, 1989 ;Utterback and Miller, 1961;Hayden and Utterback, 1964;Amme, 1969). A review is given in Langley et al (1984).…”

Section: Pawand Current Collectionmentioning

confidence: 99%

Recent results from studies of electron beam phenomena in space plasmas

Neubert

Banks

1992

Planetary and Space Science

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Abetract-Experiments involving the ejection of beams of electrons from spacecraft have been performed for more than 2 decades in order to study fundamental plasma physical processes as well as for a range of diagnostic-and application-oriented purposes. This paper reviews some of the key issues that have been pursued in the past 10 years. These include questions regarding spacecraft charging and beam dynamics, the interaction of beams with neutral gas and plasmas, and the electromagnetic radiation generated by continuous and pulsed electron beams. It is shown how our understanding of these phenomena has matured, thereby providing a solid foundation for future experiments involving the use of electron beams.

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Ionization of Helium, Neon, and Nitrogen by Helium Atoms

Cited by 121 publications

References 18 publications

Modes of generation of the optical properties of a moderate-pressure nanosecond discharge with a slit cathode in argon

Modes of generation of the optical properties of a moderate-pressure nanosecond discharge with a slit cathode in argon

Imprinted Pattern Profile-Dependent Optical Properties of Metal Nanostructures

Recent results from studies of electron beam phenomena in space plasmas

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