Effective energy deposition and latent track formation of swift heavy ions in solids

Effective energy deposition and latent track formation of swift heavy ions in solids 1 first-author 1 Institute of Modern Physics, the Chinese Academy of Sciences, Lanzhou 730000 Institute of Modern Physics, the Chinese Academy of Sciences, Lanzhou 730000 In the present paper, latent track formation in yttrium iron garnet (YIG) produced by high energy Ar ions is briefly reported at first. Then, in the framework of thermal spike model, a phenomenological parameter describing the effective energy transfer from excited electrons to lattice atoms, effective energy deposition Q eff , is deduced. Q eff is a function of ion velocity, electronic energy loss ( S e ) and mean free path λ of excited electrons in the matter, and is a time moderate term initialized by Waligorski's function of spatial energy deposition of secondary electrons ejected by incident ions. Size of ion latent track is proportional to Q eff value. From Q eff obtained by use of realistic λ values, the sizes of latent tracks in SiO 2 , YIG, Ti and Zr produced by given swift heavy ion irradiations are deduced and compared with experimental results. It is found that, from the fits to experimental results, the best λ values for SiO 2 , YIG, Ti and Zr are (6±1), (8±2), (6.1±1.0) and (9.6±1.0) nm, respectively. Moreover, the relationship between experimental damage and Q eff is discussed. Latent track Electronic energy loss Thermal spike Effective energy deposition References Meftah A , Brisard F , Costantini J M et al . Phys Rev , 1994 , B49 : 12457 - 12463 Phys Rev Dunlop A , Jaskierowicz G , Jensen J et al . Nucl Instr and Meth , 1997 , B132 : 93 - 108 Nucl Instr and Meth Meftah A , Costantini J M , Djebara M et al . Nucl Instr and Meth , 1997 , B122 : 470 - 475 Nucl Instr and Meth Meftah A , Brisard F , Costantini J M et al . Phys Rev , 1993 , B48 : 920 - 925 Phys Rev Dammak H , Dunlop A , Lesueur D et al . Phys Rev Lett , 1995 , 74 : 1135 - 1138 Phys Rev Lett Seitz F , Koehler J S . Solid State Phys , 1956 , 2 : 305 - 448 Solid State Phys Fleischer R L , Price P B , Walker R M . Nuclear tracks in solids: Principles and applications , University of California Press , 1975 Nuclear tracks in solids: Principles and applications Wang Z G , Dufour C , Paumier E et al . J Phys: Condens Matter , 1994 , 6 : 6733 - 6750 J Phys: Condens Matter Lesueur D , Dunlop A . Radiat Eff Def Sol , 1993 , 26 : 163 - 172 Radiat Eff Def Sol Waligorski M P R , Hamm R N , Katz R . Nucl Tracks Radiat Meas , 1986 , 11 : 309 - 319 Nucl Tracks Radiat Meas Ashkroft N W , Mermin N D . Solid state physics . New York : Holt, Reinhart and Winston , 1976 Solid state physics O571.33;O532 + .26 Supported by NSFC (Projects 10125522, 10175084, 10475102) and the Chinese Academy of Sciences. 2004-12-02 2005-02-01 2021-01-19 2005 Nuclear Science and Techniques 01 16