The ls-2p electronic intrasite transitions and local vibrational modes (LVM) of impurities and defects in GaAs are studied in FTIR transmission spectroscopy. These features are observed in as-grown samples and in samples which have been compensated by irradiation with 2 MeV electrons. The position of the Fermi level is monitored by observing the lowest energy ls-2p transition.
W. J. Moore,
B. V. Shanabrook,
"Infrared Studies Of Acceptors In Gallium-Arsenide", Proc. SPIE 0553, Fourier and Computerized Infrared Spectroscopy, (20 December 1985); doi: 10.1117/12.970886; https://doi.org/10.1117/12.970886