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Neutralization and Ionization of High-Velocity Ions of Neon, Argon and Krypton by Collison with Similar Atoms

Neutralization and Ionization of High-Velocity Ions of Neon, Argon and Krypton by Collison with... Rudnick's work on the measurement of the free path L 0 for the ionization of a helium atom and the free path L 1 for neutralization of a helium ion in helium, has been extended to the gases neon, argon, and krypton for the velocity range corresponding to accelerating potentials of 10,000 to 22,000 volts. With neon, the work has covered the pressure range from 0.75× 10 - 2 mm to 4× 10 - 2 mm; with argon, from 0.30× 10 - 2 mm to 1.6× 10 - 2 mm; and with krypton, from 0.30× 10 - 2 mm to 1.4× 10 - 2 mm. In all cases, the free path for ionization, reduced to 760 mm pressure, is found to be approximately 6.5× 10 - 4 cm. For neon, the free path for neutralization is 0.95× 10 - 4 cm; for argon, 0.45× 10 - 4 cm; and for krypton, 0.35× 10 - 4 cm. Both free paths decrease with increasing velocity. The fraction F ∞ of neutral atoms in the beam when the equilibrium condition is reached is approximately 0.86 for neon, 0.93 for argon, and 0.95 for krypton. This fraction decreases with increasing velocity for neon and argon but appears to increase slightly for krypton. The observed dependence of the free paths on pressure is compared with the theoretical dependence. The results obtained are compared with the low-velocity measurements of other workers and the differences discussed. The relationship of this work to Doppler effect experiments with neon and argon is considered. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

Neutralization and Ionization of High-Velocity Ions of Neon, Argon and Krypton by Collison with Similar Atoms

Physical Review , Volume 42 (6) – Dec 15, 1932
13 pages

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Publisher
American Physical Society (APS)
Copyright
Copyright © 1932 The American Physical Society
ISSN
1536-6065
DOI
10.1103/PhysRev.42.753
Publisher site
See Article on Publisher Site

Abstract

Rudnick's work on the measurement of the free path L 0 for the ionization of a helium atom and the free path L 1 for neutralization of a helium ion in helium, has been extended to the gases neon, argon, and krypton for the velocity range corresponding to accelerating potentials of 10,000 to 22,000 volts. With neon, the work has covered the pressure range from 0.75× 10 - 2 mm to 4× 10 - 2 mm; with argon, from 0.30× 10 - 2 mm to 1.6× 10 - 2 mm; and with krypton, from 0.30× 10 - 2 mm to 1.4× 10 - 2 mm. In all cases, the free path for ionization, reduced to 760 mm pressure, is found to be approximately 6.5× 10 - 4 cm. For neon, the free path for neutralization is 0.95× 10 - 4 cm; for argon, 0.45× 10 - 4 cm; and for krypton, 0.35× 10 - 4 cm. Both free paths decrease with increasing velocity. The fraction F ∞ of neutral atoms in the beam when the equilibrium condition is reached is approximately 0.86 for neon, 0.93 for argon, and 0.95 for krypton. This fraction decreases with increasing velocity for neon and argon but appears to increase slightly for krypton. The observed dependence of the free paths on pressure is compared with the theoretical dependence. The results obtained are compared with the low-velocity measurements of other workers and the differences discussed. The relationship of this work to Doppler effect experiments with neon and argon is considered.

Journal

Physical ReviewAmerican Physical Society (APS)

Published: Dec 15, 1932

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