Bethe–Bloch stopping-power parameters for GaAs and ZnSe

✍ Scribed by L. E. Porter

• Book ID: 101253904
• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 282 KB
• Volume: 70
• Category: Article
• ISSN: 0020-7608
• DOI: 10.1002/(sici)1097-461x(1998)70:4/5<919::aid-qua37>3.0.co;2-t

✦ Synopsis

If one is to calculate the stopping power for a specified projectile᎐target combination within the energy interval of applicability of modified Bethe᎐Bloch theory, values of several parameters appearing in the formulation must be ascertained. In the past, the author has established such values for numerous target materials through fits of stopping-power measurements with modified Bethe᎐Bloch theory. However, the semiconductor materials ZnSe and GaAs have not yet been thus characterized. A set of very recent measurements of the stopping powers of each compound for low-energy protons and alpha particles, reported by members of the Helsinki group, has been analyzed in order to remedy this dearth of parameter values. Moreover, some corresponding measurements for 7 Li ions traversing ZnSe have been analyzed for the purpose of obtaining the value of a single effective charge parameter. Results of these studies are reasonably consistent with expectations, and values are recommended for the mean excitation energy and the Barkas-effect parameter for each compound.