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

LOW ENERGY ACCELERATOR, RAY TECHNOLOGY AND APPLICATIONS

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

WANG Zhi-Guang，

JIN Yun-Fan

Nuclear Science and Techniques

Vol.16, No.1

pp.12-16

Published in print 01 Feb 2005

CLC：O571.33;O532+.26

42000

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 SiO₂, 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 SiO₂, 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 trackElectronic energy lossThermal spikeEffective energy deposition

References

[1]

Meftah A, Brisard F, Costantini J M et al. Phys Rev, 1994, B49: 12457-12463

[2]

Dunlop A, Jaskierowicz G, Jensen J et al. Nucl Instr and Meth, 1997, B132: 93-108

[3]

Meftah A, Costantini J M, Djebara M et al. Nucl Instr and Meth, 1997, B122: 470-475

[4]

Meftah A, Brisard F, Costantini J M et al. Phys Rev, 1993, B48: 920-925

[5]

Dammak H, Dunlop A, Lesueur D et al. Phys Rev Lett, 1995, 74: 1135-1138

[6]

Seitz F, Koehler J S. Solid State Phys, 1956, 2: 305-448

[7]

Fleischer R L, Price P B, Walker R M. Nuclear tracks in solids: Principles and applications, University of California Press, 1975

[8]

Wang Z G, Dufour C, Paumier E et al. J Phys: Condens Matter, 1994, 6: 6733-6750

[9]

Lesueur D, Dunlop A. Radiat Eff Def Sol, 1993, 26: 163-172

[10]

Waligorski M P R, Hamm R N, Katz R. Nucl Tracks Radiat Meas, 1986, 11: 309-319

[11]

Ashkroft N W, Mermin N D. Solid state physics. New York: Holt, Reinhart and Winston, 1976