SECONDARY ELECTRON EMISSION FROM METAL SURFACES BY H$sup +$, H$sup 0$, He$sup +$, AND He$sup 0$ BOMBARDMENTS
Journal Article
·
· Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
Secondary electron emission coefficients for metal surfaces bombarded by H/sup +/, H/sub 0/, He/sup +/, and He/sup 0/, and the ratios / have been calculated. As in a previous paper, it is assumed that internal secondaries are produced by ionization. For the energy range 20 kev to 2 Mev, Bethe's formula for ionization cross section has been modified to the form Q/sub B//(1 + BETA / T), where Q/sub BB/ is the ionization cross section given by Bethe's original expression, BETA is a constant, and T is the energy of the incident ion. For a proton beam, the capture cross section becomes appreciable for energy less than 200 kev. Hence, the beam is considered as a two-component system consisting of protons and hydrogen atoms both producing internal secondaries. Above this energy rate, the beam is considered as a one-component system. Similarly, a hydrogen atomic beam has been considered as a three-component system consisting of H/sup +/, H/sup 0/, and electrons, and a helium beam for energy greater than 80 kev as a four-component system consisting of He/sup 0/, He/sup +/, He/sup ++/, and electrons. Below 80 kev, the helium beam is regarded as a mixture of He/sup 0/, He/sup +/, and electrons which produce secondaries by ionization. The calculated secondary electron emission coefficients are compared with experimental data. The agreements are satisfactory as the percentage deviation is only about 10%. (auth)
- Research Organization:
- Univ. of Allahabad, India
- NSA Number:
- NSA-17-011397
- OSTI ID:
- 4725890
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 129; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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