Self-Absorption in Copper Hollow Cathode Discharges; Effects on Spectral Lineshape and Absorption Sensitivity

摘要

The intensity of the hyperfine doublet of the Cu I 324.8 nm transition was observed as a function of current, fill gas, and fill gas pressure for a new design of hollow cathode lamp incorporating a positive column and an enlarged volume cathode cavity. The intensity ratio of the two components, which reflects the degree of self-absorption, and the flame absorption sensitivity were compared with a conventional hollow cathode lamp. Higher intensity, better component ratio, and increased absorption sensitivity was found in the new lamp. Keywords: Hollow cathode; Spectral lineshape; Atomic absorption; Copper; Self absorption.