Surface Treatment of Non-Ferrous Metals for the Purpose of Gas Analysis

摘要

The present report is an updating of earlier reports published in 1972 and 1976. Its major improvement compared to the earlier reports is that greater importance has been devoted to quantify the parameters of mechanical shaping techniques to be used with or without subsequent chemical etching. Surface treatments have been studied and standardized for a number of non-ferrous metals. Recommendations were generally made on the basis of the following: the proposed treatment must give a minimum surface content; it must exhibit good reproducibility; it must be easy to perform with equipment normally available in analytical laboratories. The recommended treatments are presented in the form of sheets. They give full information on mechanical shaping parameters if these are important, and -if needed- the subsequent chemical etching conditions. Typical residual surface contents are given for oxygen, carbon and nitrogen. They refer to samples freshly prepared. The metals or alloys concerned a decay into a proton (antiproton) and a pion. The polarization is near to zero for psub(T) < 0.2 GeV/c and it is negative for large psub(T) values. A similarity in the annihilations of anti pp and e exp + e exp - leading to the Ksub(s)sup(0) production is pointed out. (Atomindex citation 12:572854)