6533b838fe1ef96bd12a4f16

RESEARCH PRODUCT

Negative ions and their importance for the analysis of residual gas

subject

description

Abstract In the case of heavy molecules, mass spectre obtained with the help of positive ions generally lead to the recording of fragments only, and thus do not indicate the true original mass. In order to overcome this drawback, an attempt was made to attach slow electrons to heavy molecules, since less dissociation products are expected with spectre produced by negative ions. As a preliminary experiment, a simple and cheap form of ion source was constructed which produces mainly atomic negative ions.