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Gallium

  • Created July 22, 2020
  • Author Mark Isaacs
  • Category Elements

Gallium XPS analysis may be obtained via either the 2p or 3d regions, primarily. The 3d region may possibly provide an additional insight into the chemical speciation involved, while the 2p region is more intense.

The Ga 3d region may overlap with O 2s, In 4d, S 3s, P 3s, Ba 5p, K 3p and La 5p. The Ga 2p region may overlap with the N KLL auger and while the La 3p3/2 peak may intersect the Ga 2p3/2 and 2p1/2, the energy differences and large doublet separation of Ga 2p (26.9 eV) result in a relatively trivial deconvolution.

Species2p EB / eV3d EB / eVCharge Ref.Ref.
Ga1116.4918.39C 1s / 284.8 eV1
Ga(I)1118.3 ± 0.920.25 ± 1C 1s / 284.8 eV1
Ga(II)1118.5 ± 0.320.7 ± 0.35C 1s / 284.8 eV1
Ga2O31117.8020.00C 1s / 284.8 eV1
GaCl31119.8521.91C 1s / 284.8 eV1
GaBr31119.4521.48C 1s / 284.8 eV1
GaI31119.1721.06C 1s / 284.8 eV1
Ga2I41118.7220.80C 1s / 284.8 eV1
Ga2Cl41119.5421.77C 1s / 284.8 eV1
Table 1: Binding energies (EB) for some common gallium species

References

  1. Bourque, J. L., et al. (2016). “Chemical state determination of molecular gallium compounds using XPS.” Dalton Transactions 45(18): 7678-7696. Read it online here.

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