Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

The Secondary Emission from a Nickel Surface due to Slow Positive Ion Bombardment

The Secondary Emission from a Nickel Surface due to Slow Positive Ion Bombardment The apparatus was arranged so that positive ions from a heated Mo strip coated with aluminum phosphate, were accelerated radially through slots in shields A and B , and a wider slot in an electrode C to the target T , from which the secondary emission to the electrode C was measured. The parts A , B , C and T were all concentric nickel cylinders, symmetrically placed about the emitter. If the potential of the emitter is made zero and the accelerating potential V 1 , when the collector is at zero potential only reflected positives are collected. As the potential is increased, secondaries also reach it, the net negative charge increasing until a saturating potential 2 V 1 is reached, when all negatives and no positives are collected. The percentage saturated secondary electron emission was found to increase approximately as the square of the primary ion energy, reaching 22 percent of the primary ion current, for primary ions of energies corresponding to 380 volts. The curves show that large numbers of reflected positive ions have energies between zero and two volts, and there is also a group of reflected positive ions with energies approximately 0.9 of the primary energy. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

The Secondary Emission from a Nickel Surface due to Slow Positive Ion Bombardment

Physical Review , Volume 26 (6) – Dec 1, 1925
7 pages

Loading next page...
 
/lp/american-physical-society-aps/the-secondary-emission-from-a-nickel-surface-due-to-slow-positive-ion-t7XSeSB912

References (0)

References for this paper are not available at this time. We will be adding them shortly, thank you for your patience.

Publisher
American Physical Society (APS)
Copyright
Copyright © 1925 The American Physical Society
ISSN
1536-6065
DOI
10.1103/PhysRev.26.800
Publisher site
See Article on Publisher Site

Abstract

The apparatus was arranged so that positive ions from a heated Mo strip coated with aluminum phosphate, were accelerated radially through slots in shields A and B , and a wider slot in an electrode C to the target T , from which the secondary emission to the electrode C was measured. The parts A , B , C and T were all concentric nickel cylinders, symmetrically placed about the emitter. If the potential of the emitter is made zero and the accelerating potential V 1 , when the collector is at zero potential only reflected positives are collected. As the potential is increased, secondaries also reach it, the net negative charge increasing until a saturating potential 2 V 1 is reached, when all negatives and no positives are collected. The percentage saturated secondary electron emission was found to increase approximately as the square of the primary ion energy, reaching 22 percent of the primary ion current, for primary ions of energies corresponding to 380 volts. The curves show that large numbers of reflected positive ions have energies between zero and two volts, and there is also a group of reflected positive ions with energies approximately 0.9 of the primary energy.

Journal

Physical ReviewAmerican Physical Society (APS)

Published: Dec 1, 1925

There are no references for this article.