Abstract
Ion emission due to the sputtering of metallic cadmium by α particles from 238Pu is studied. Experiments are carried out in helium at different cadmium foil temperatures (from 20 to 280°C) and gas pressures (from 75 to 2200 torr). The sputtering of the metallic cadmium causes the emission of Cd(II) excited ions in the 4d 95s 22 D 3/2, 5/2 and 4d 106s 2 S 1/2 states. Above 160°C, the population of these stares grows exponentially. At a temperature of 240°C and a helium pressure in the chamber of 600 torr, the sputtering ratio of metallic cadmium is found to be 6.26×10−14 g per α particle; i.e., one α particle knocks out about 108 cadmium atoms from the foil. From spectroscopy and microphotography examinations of the metallic sample surface, a two-step model of ion emission is suggested. The model involves (1) the formation of a high-temperature wedge, which ejects a cadmium droplet, and (2) self-diffusion of displaced cadmium atoms in the droplet toward the surface.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
G. F. Thomas, Surf. Sci. 90, 381 (1979).
Handbook of Physical Quantities, Ed. by I. S. Grigoriev and E. Z. Meilikhov (Énergoatomizdat, Moscow, 1991; CRC Press, Boca Raton, 1997), Chap. 25, p. 590.
Z. Yu. Gotra, Reference Book on the Technology of Microelectronic Devices (Radio i Svyaz’, Moscow, 1991), p. 528.
B. E. Warner, K. B. Persson, and G. J. Collins, J. Appl. Phys. 50, 5694 (1979).
A. M. Shukhtin, G. A. Fedotov, and V. G. Mishakov, Opt. Spektrosk. 40, 411 (1976) [Opt. Spectrosc. 40, 237 (1976)].
E. K. Karabut, V. S. Mikhalevskii, V. F. Papakin, and M. F. Sém, Zh. Tekh. Fiz. 39, 1923 (1969) [Sov. Phys. Tech. Phys. 14, 1447 (1969)].
B. M. Aleksandrov, I. A. Baranov, A. S. Krivokhvatskii, and G. A. Tutin, At. Énerg. 33, 821 (1972).
A. P. Kopai-Gora, A. A. Mavlyutov, A. I. Mis’kevich, and B. S. Salamakha, Opt. Spektrosk. 67, 526 (1989) [Opt. Spectrosc. 67, 307 (1989)].
A. A. Mavlyutov, A. I. Mis’kevich, and B. S. Salamakha, Laser Phys. 3, 94 (1993).
A. A. Mavlyutov, A. I. Mis’kevich, and Zhao Xiaolin, Prib. Tekh. Éksp., No. 3, 114 (2001).
J. I. Collins, J. Appl. Phys. 44, 4633 (1973).
P. P. D’yachenko, Yu. B. Dorofeev, E. D. Poletaev, and M. Z. Tarasko, in Proceedings of the Conference “Physics of Nuclear-Excited Plasma and Problems of Nuclear-Pumped Lasers,” Obninsk, 1992, Vol. 1, p. 166.
É. P. Magda, in Proceedings of the Conference “Physics of Nuclear-Excited Plasma and Problems of Nuclear Pumped Lasers,” Obninsk, 1992, Vol. 1, p. 65.
A. I. Mis’kevich, V. S. Il’yashenko, B. S. Salamakha, et al., Zh. Tekh. Fiz. 52, 402 (1982) [Sov. Phys. Tech. Phys. 27, 260 (1982)].
A. P. Kopai-Gora, A. A. Mavlyutov, A. I. Mis’kevich, and B. S. Salamakha, Pis’ma Zh. Tekh. Fiz. 16(11), 23 (1990) [Sov. Tech. Phys. Lett. 16, 411 (1990)].
V. T. Cherepin and M. A. Vasil’ev, Secondary Ion-Ion Emission in Metals and Alloys (Kiev, 1975).
Author information
Authors and Affiliations
Additional information
__________
Translated from Zhurnal Tekhnichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 72, No. 7, 2002, pp. 122–128.
Original Russian Text Copyright © 2002 by Mis’kevich, Zhao Xiaolin.
Rights and permissions
About this article
Cite this article
Mis’kevich, A.I., Zhao, X. Emission of cadmium excited ions upon α particle bombardment. Tech. Phys. 47, 915–920 (2002). https://doi.org/10.1134/1.1495059
Received:
Issue Date:
DOI: https://doi.org/10.1134/1.1495059