Hydrogen wag modes and transverse carbon modes of H-CAs complexes in GaAs doped with 12C or 13C
Infrared absorption measurements have been made of the vibrational modes of H-12CAs, D-12CAs, H-13CAs and D-13CAs pairs in GaAs. All modes of A1-symmetry have been identified, together with the two E-modes of D-12CAs and D-13CAs pairs and the transverse carbon E-modes of paired 12CAs and 13CAs impurities. The D-wag modes lie below the transverse carbon E-modes, while the H-wag modes lie at higher frequencies than the carbon modes. An anticrossing behaviour explains why the transverse modes of D-CAs pairs occur at higher frequencies than those of H-CAs pairs.