Comment on an improved critical angle equation for channeling

✍ Scribed by Zhu Lin Zhang; Lai Zhang; Karur R. Padmanabhan

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 162 KB
• Volume: 269
• Category: Article
• ISSN: 0168-583X
• DOI: 10.1016/j.nimb.2010.11.007

✦ Synopsis

Recently, Li-Ping Zheng et al., proposed an improved critical angle equation for ion channeling [1,2]. In the comment, we show that the equation leads to a physically unrealistic result.

If an ion (atomic number Z, atomic mass M) moving with energy E enters a crystal (atomic number z, atomic mass m) at small enough angle with respect to an atomic row (or string), the ion channeling could happen. Considering the conservation of transverse energy, Lindhard set the critical transverse energy, EW 2 C equal to U C and derived a formula to determine the critical angle W C for channeling [3],