Ion-induced kinetic electron emission from 6LiF, 7LiF and MgF2 thin films

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 25 ?C to 300 ?C. The electron yield of LiF is found to sharply increase with target temperature and to be saturated at about 175 ?C. But the target temperature has no effect on the electron yield of MgF2. It is also found that for the ion energies greater than 4 keV, 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.

[1]  A. Qayyum,et al.  Monte Carlo simulation of ion-induced secondary electron emission from MgO film , 2008 .

[2]  J. Ullrich,et al.  Electron Emission from Insulators Irradiated by Slow Highly Charged Ions , 2008 .

[3]  A. Qayyum,et al.  Electron emission from carbon induced by the ions C+, O+, CO+ and O2+ , 2007 .

[4]  F. Aumayr,et al.  Ion-induced kinetic electron emission from HOPG with different surface orientation , 2005 .

[5]  F. Aumayr,et al.  Separation of potential and kinetic electron emission for grazing impact of multiply charged Ar ions on a LiF(001) surface. , 2004, Physical review letters.

[6]  K. Ohya,et al.  Monte Carlo study of secondary electron emission from SiO2 induced by focused gallium ion beams , 2004 .

[7]  K. Whang,et al.  Secondary electron ejection from the MgO protection layer in AC plasma display panels for low-energy noble ions , 2003 .

[8]  R. Baragiola,et al.  Electron emission from MgO by exciton decay into vacuum , 2004 .

[9]  K. Ohya.  Monte Carlo simulation of heavy ion induced kinetic electron emission from an Al surface , 2002 .

[10]  F. Aumayr,et al.  Electron emission from clean gold bombarded by slow Auq+(q=1–3) ions , 2000 .

[11]  N. Matsunami,et al.  Secondary charged particles emitted from non-metallic surfaces under low-energy ion impact , 1999 .

[12]  F. Aumayr,et al.  Electron emission from polycrystalline lithium fluoride bombarded by slow multicharged ions , 1995 .

[13]  P. Bauer,et al.  Kinetic electron emission yield induced by H+ and He2+ ions versus stopping power for Al, Cu, Ag and Au☆ , 1994 .

[14]  Holmén,et al.  Electron emission from ion-bombarded SiO2 thin films. , 1994, Physical review. B, Condensed matter.

[15]  D. R. Penn,et al.  Calculations of electron inelastic mean free paths. III. Data for 15 inorganic compounds over the 50–2000 eV range , 1991 .

[16]  K. Groeneveld,et al.  Particle Induced Electron Emission I , 1991 .

[17]  R. Kanno,et al.  Ionic conduction inxMF(95?x)ZrF45LaF3 (M=alkali metal) glasses: Part III Fluoride ion conduction in xLiF(95?x)ZrF45LaF3 glasses , 1991 .

[18]  Keller,et al.  Secondary-electron yields from thin foils: A possible probe for the electronic stopping power of heavy ions. , 1990, Physical review. A, Atomic, molecular, and optical physics.

[19]  G. Lakits,et al.  Statistics of ion‐induced electron emission from a clean metal surface , 1989 .

[20]  C. Biedermann,et al.  Secondary electron emission from entrance and exit surfaces of thin clean foils bombarded with H + , C + , and O + , 1989 .

[21]  K. Groeneveld,et al.  Heavy Ion Induced Electron Emission from Solid Surfaces , 1983 .

[22]  B. Svensson,et al.  Electron emission from ion‐bombarded aluminum , 1981 .

[23]  A. Scharmann,et al.  Ion induced electron emission from metal surfaces , 1981 .

[24]  J. Schou,et al.  Transport theory for kinetic emission of secondary electrons from solids , 1980 .

[25]  R. Baragiola,et al.  Z1dependence of ion-induced electron emission from aluminum , 1980 .

[26]  R. Baragiola,et al.  Ion-induced electron emission from clean metals , 1979 .

[27]  R. Baragiola,et al.  Electron emission from clean metal surfaces induced by low-energy light ions , 1979 .

[28]  E. J. Sternglass,et al.  Theory of Secondary Electron Emission by High-Speed Ions , 1957 .