Zeeman Splitting and Chemical Shifts for the Shallow Donor States in CdTe

Zeeman splitting of the shallow donor states of very high purity n‐type CdTe is studied by means of extrinsic photoconductivity experiments. Pine structure due to chemical shifts of a t least six different donor types is observed on the 1s → 2p and the 1s → 3p transitions. The magnitude of the chemical shifts observed (1 to 8 cm‐l) suggests a lower value for the effective Rydberg (106 cm −1 ) than the value found in previous magneto‐optical experiments. Resonant polaron effects are detected on the 1s → 2p + line a t high magnetic fields.