Coincidence Measurements of Large-Angle<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Ar</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>-on-Ar Collisions

Kessel, Q. C.; Everhart, E.

doi:10.1103/physrev.146.16

Cited by 122 publications

(17 citation statements)

References 14 publications

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“…5 Near 25 keV, 9°, some effects are seen which are analogous to those found in Ar + -Ar in its active region, 5 25 keV, 16°. Thus the average charge of the scattered particle, plotted ver-sus scattering angle 9 [ Fig.…”

Section: I-i-i-i I I-m I I Isupporting

confidence: 60%

Qstructure and Inner-Shell Vacancies in Neon-Neon and Krypton-Krypton Collisions

et al. 1968

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In close encounters of the systems Ne-Ne, Ne + -Ne, and Ne ++ -Ne, electrons of 750-eV energy are produced. The numbers of such fast electrons are found to depend upon the charge state of the incident particle (0,+l, or +2) in the ratio of 0.6, 1.0, and 2.0, respectively. This agrees in part with a prediction by Lichten. In Kr + -Kr collisions, there is a sudden change in the average number of electrons lost for 9° scattering at 25-keV incident energy.Previous studies have shown that 200-keV Ne + ions incident upon neon gas cause ejection of 750-eV electrons . l > 2 Coincidence measurements 3 at the same energy showed that there are two distinct values of the average inelastic energy loss Q, one at 710 eV and the other at 1550 eV, for the reaction Ne + + Ne^Ne 5+ +Ne 3+ + 7e (1) with the scattering angle 6 set at 8°. These two results suggested 3 that a K-shell vacancy can be created by such collisions. Lichten 4 drew energy-level diagrams for the Ne-Ne system and made a qualitative explanation in terms of a K-shell promotion mechanism. He predicted that the number of fast electrons should be dependent upon the charge of the incident neon, in the ratio of 0, 1, and 2 for Ne, Ne + , and Ne ++ , respectively.Our experiment is performed to check Lichten's prediction. Here Ne, Ne + , and Ne ++ of 200-keV energy are sent through neon gas. Previously described apparatus and procedures 5 are used to make a (noncoincident) energy analysis of the resulting fast electrons and later to determine (with coincidence methods) the Q values at 10° scattering. Figure 1(a) shows the electron energy distributions, normalized to the same incident-particle flux per unit target gas density, for the three different cases. The data are taken with electrons scattered at 95° to the incident direction, this angle chosen to prevent scattered neons from reaching the detector and to limit Doppler broadening (see Ref.

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Section: I-i-i-i I I-m I I Isupporting

confidence: 60%

Qstructure and Inner-Shell Vacancies in Neon-Neon and Krypton-Krypton Collisions

et al. 1968

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“…A simple kinematic analysis 3 shows that after the collision one particle will, in general, arrive at its detector before the partner arrives at the other detector. If both detectors are the same distance from the scattering center, the difference in arrival times is…”

Section: A Theory and Notationmentioning

confidence: 99%

“…1 appears in this position). Each detector box is attached by bellows to a vacuum pump that maintains a vacuum better than 10~6 Torr in the box, against the target-gas pressure of nearly 10" 3 Torr in the collision chamber. Background pressure in these boxes, measured without target gas in the collision chamber, is approximately 2x 10~8 Torr.…”

Section: General Featuresmentioning

confidence: 99%

“…conventional methods could provide. First reported by Afrosimov, Gordeev, Panov, and Federenko 1 * 2 and, independently, by Kessel and Everhart,3 results of experiments 1 " 6 using these techniques have prompted increased interest in the theory of interpenetrating-shell phenomena. These theoretical efforts 7 " 12 have produced a qualitative understanding of the general features of close-encounter atomic interactions; in fact, some quantitative theoretical predictions have found empirical verification.…”

Section: Introductionmentioning

confidence: 99%

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Delayed-Coincidence Study ofO++ Ar Collisions at 50-200 keV

Bingham¹

1969

Phys. Rev.

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“…The momenta of those ions, whose energies in the present context were extremely high, have been measured for example by Everhard and Kessel [39,40] and Federenko [41]. For fast charged-particle collisions and photoionization, the recoil ion energies are in the meV regime or even below.…”

Section: Introductionmentioning

confidence: 99%