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Ion-induced kinetic electron emission from 6LiF,7LiF and MgF2 thin films |
S. Ullaha), A. H. Dogarb), M. Ashrafc), and A. Qayyumb)† |
a Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad, Pakistan; b Physics Division, Pakistan Institute of Nuclear Science and Technology, P. O. Nilore, Islamabad, Pakistanc Optics Laboratories, P. O. Box 1021, Islamabad, Pakistan |
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Abstract Secondary electron yields for Ar+ impact on 6LiF,7LiF and MgF2 thin films grown on aluminum substrates are measured each as a function of target temperature and projectile energy. Remarkably different behaviours of the electron yields for LiF and MgF2 films are observed in a temperature range from 25o to 300o. The electron yield of LiF is found to sharply increase with target temperature and to be saturated at about 175o. But the target temperature has no effect on the electron yield of MgF2. It is also found that for the ion energies greater than 4keV, the electron yield of 6LiF is consistently high as compared with that of 7LiF that may be due to the enhanced contribution of recoiling 6Li atoms to the secondary electron generation. A comparison between the electron yields of MgF2 and LiF reveales that above a certain ion energy the electron yield of MgF2 is considerably low as compared with that of LiF. We suggest that the short inelastic mean free path of electrons in MgF2 can be one of the reasons for its low electron yield.
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Received: 28 August 2009
Revised: 18 January 2010
Accepted manuscript online:
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PACS:
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79.20.Hx
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(Electron impact: secondary emission)
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68.55.A-
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(Nucleation and growth)
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81.15.-z
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(Methods of deposition of films and coatings; film growth and epitaxy)
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Fund: Project partially supported by the Higher Education Commission of Pakistan through indigenous PhD program. |
Cite this article:
S. Ullah, A. H. Dogar, M. Ashraf, and A. Qayyum Ion-induced kinetic electron emission from 6LiF,7LiF and MgF2 thin films 2010 Chin. Phys. B 19 083401
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