SECONDARY ELECTRON EMISSION FROM CLEAN SURFACE OF MOLYBDENUM DUE TO LOW- ENERGY NOBLE GAS IONS
Secondary electron yields from clean, polycrystalline, molybdenum bombarded by He/sup +/ and Ar/sup +/ have been measured for the kinetic energy range 100 ev to 2.5 kev. This covers the transition energy region where electron ejection processes depending on the translational energy of the bombarding particle are superposed on those depending on their potential energies. A definite kinetic energy threshold for electron ejection is observed for He/sup +/ at about 500 ev and for Ar/sup +/ at about 700 ev. For He/sup +/, the yield drops as the energy increases to about 500 ev and, thereafter, increases linearly with energy. In the case of Ar/sup +/ gamma is relatively insensitive to beam energy up to the kinetic threshold and, thereafter, increases linearly. The agreement between the observed variation of gamma with ion kinetic energy and a theoretical calculation of the same is discussed. (auth)
- Research Organization:
- General Dynamics/Astronautics, San Diego, Calif.
- NSA Number:
- NSA-17-006855
- OSTI ID:
- 4733415
- 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- Physical Review (U.S.) Superseded in part by Phys.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, Vol. Vol: 129; Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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