Channeling of 1-MeVHe+Ions in NaCl: Damage and Temperature Effects

Channeling of 1-MeV ${\mathrm{He}}^{+}$ ions in NaCl has been studied over the temperature range 77-870 K. The rate of damage by the ${\mathrm{He}}^{+}$ ions at 77 and 300 K was measured. A previously unobserved reduction in ${\chi }_{min}$ occurred at ion doses > 5 × ${10}^{15}$ ions/${\mathrm{cm}}^2$. Measured ${\chi }_{min}$ ($〈100〉$) values for undamaged NaCl were 2% at 77 K rising to 10% at 870 K. These are the first quantitative ${\chi }_{min}$ data for ${\mathrm{He}}^{+}$ ion channeling in NaCl.