Please wait a minute...
Chin. Phys. B, 2010, Vol. 19(8): 083401    DOI: 10.1088/1674-1056/19/8/083401
ATOMIC AND MOLECULAR PHYSICS Prev   Next  

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
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.
Keywords:  ion-induced electron emission      alkali halides      electronic stopping      electron mean free path  
Received:  28 August 2009      Revised:  18 January 2010      Accepted manuscript online: 
PACS:  79.20.Hx (Electron impact: secondary emission)  
  68.55.A- (Nucleation and growth)  
  81.15.-z (Methods of deposition of films and coatings; film growth and epitaxy)  
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

[1] Sternglass E J 1957 Phys. Rev. 108 1
[2] Hasselkamp D 1992 Particle Induced Electron Emission II (Heidelberg: Springer) p. 112
[3] Schou J 1980 Phys. Rev. B 22 2141
[4] Baragiola R A, Alonso E A and Oliva-Florio A 1979 Phys. Rev. B 19 121
[5] Baragiola R A, Alonso E A, Ferron J and Oliva-Florio A 1979 Sur. Sci. 90 240
[6] Alonso E A, Baragiola R A, Ferr'on J, Jakas M M and Oliva-Florio A 1980 Phys. Rev. B 22 80
[7] Lakits G, Aumayr F and Winter H P 1989 Rev. Sci. Instr. 60 3151
[8] Cernusca S, Fürsatz M, Winter H P and Aumayr F 2005 Europhys. Lett. 70 768
[9] Rothard H, Kroneberger K, Veje E, Clouvas A, Lorenzen P, Keller N, Kemmler J, Meckbach W and Groeneveld K O 1990 Phys. Rev. A 41 2521
[10] Hasselkamp D, Lang K G, Scharmann A and Stiller N 1981 Instr. Method 180 349
[11] Hosaka K, Matsunami N and Tawara H 1999 Instr. Method B 149 414
[12] Lee S K, Kim J H, Lee J and Whang K W 2003 Thin Solid Films 435 69
[13] Riccardi P, Ishimoto M, Barone P and Baragiola R A 2004 Surf. Sci. 571 L305
[14] St"ockl J, Suta T, Ditori F, Winter H P and Aumayr F 2004 Phys. Rev. Lett. 93 263201
[15] Meissl W, Winklehner D, Aumayr F, Simon M C, Ginzel R, L'opez J R C, Ullrich J, Solleder B, Lemel C and Burgd"orfer J 2008 e-J. Surf. Sci. Nanotech. 6 54
[16] Dogar A H, Ullah S and Qayyum A 2007 Nucl. Instr. Method B 260 525
[17] Eder H, Messerschmidt W, Winter H P and Aumayr F 2000 J. Appl. Phys. 87 8198
[18] Kawamoto Y, Kanno R and Fujiwara J 1991 J. Mater. Sci. Lett. 10 804
[19] Konig W, Krebs K and Rogaschewski S 1975 Int. J. Mass Spectrom. 16 243
[20] Vana M, Aumayr F, Varga P and Winter H P 1995 Nucl. Instr. Method B 100 284
[21] Benka O, Steinbauer E and Bauer P 1994 Nucl. Instr. Method B 90 64
[22] Jacobsson H and Holm'en G 1994 Phys. Rev. B 49 1789
[23] Frischkorn H J and Groeneveld K O 1983 Phys. Scripta T6 89
[24] Rothard H, Kroneberger K, Burkhard M, Kemmler J, Koschar P, Heil O, Biedermann C, Lencinas S, Keller N, Lorenzen P, Hofmann D, Clouvas A, Groeneveld K O and Veje E 1989 Radiation Effects and Defects in Solids 109 281
[25] Svensson B and Holm'en G 1981 J. Appl. Phys. 52 6928
[26] Ohya K 2002 Nucl. Instr. Method B 195 281
[27] Ohya K and Ishitani T 2004 Appl. Sur. Sci. 237 606
[28] Ullah S, Dogar A H and Qayyum A 2008 Eur. Phys. J. Appl. Phys. 44 235
[29] Ziegler J F SRIM 2008 http://www.srim.org/
[30] Tanuma S, Powell C J and Penn D R 1994 Surf. Interface Anal. 21 165
[1] Development of an electronic stopping power model based on deep learning and its application in ion range prediction
Xun Guo(郭寻), Hao Wang(王浩), Changkai Li(李长楷),Shijun Zhao(赵仕俊), Ke Jin(靳柯), and Jianming Xue(薛建明). Chin. Phys. B, 2022, 31(7): 073402.
[2] Electron emission induced by keV protons from tungsten surface at different temperatures
Li-Xia Zeng(曾利霞), Xian-Ming Zhou(周贤明), Rui Cheng(程锐), Yu Liu(柳钰), Xiao-An Zhang(张小安), and Zhong-Feng Xu(徐忠锋). Chin. Phys. B, 2022, 31(7): 073202.
No Suggested Reading articles found!