TRANSMISSION SPUTTERING RATIO IN MONOCRYSTALLINE SILVER FOILS BY HIGH ENERGY PROTONS.

The transmission sputtering ratio for protons in monocrystalline silver foils was determined over the energy range from 250 KeV to 700 KeV and found to be approximately .01 for the 111 orientation. The sputtering ratio was found to be an insensitive function of proton energy and target thickness. Target films were prepared by epitaxial growth on the 111 cleavage face of lithium fluoride substrates, and were approximately 98 oriented. Film thickness varied from 11,300 to 30,600 A. Sputtered silver was collected on pyrolitic graphite, irradiated in a thermal neutron flux of 4.5 x 10 to the 10th power neutronsq cmsec and detected by computer analysis of the resulting decay curves. Preferential ejection of protons and silver atoms along low index directions of the targets and radiation damage effects were observed. Author