Further aspects of the piezospectroscopy of singly ionized zinc in germanium

A study of the excitation spectrum of singly ionized zinc in germanium under very high signal-to-noise ratios has revealed the $A^{\prime }$, $A^{\prime \prime }$, and $G$ lines of this acceptor; the latter line is extremely weak. A number of further features have been observed at stresses higher than those previously used. The most striking effect is the dramatic growth of the $G$ components under stress due to very strong interaction between the substates of the excited state of the $G$ line and those of the excited state of the $D$ line. This interaction also causes strong nonlinear effects in the stress dependence of the energies of the stress-induced components of the excitation lines. More reliable deformation-potential constants are obtained than those previously given.