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.
|Species||2p EB / eV||3d EB / eV||Charge Ref.||Ref.|
|Ga||1116.49||18.39||C 1s / 284.8 eV||1|
|Ga(I)||1118.3 ± 0.9||20.25 ± 1||C 1s / 284.8 eV||1|
|Ga(II)||1118.5 ± 0.3||20.7 ± 0.35||C 1s / 284.8 eV||1|
|Ga2O3||1117.80||20.00||C 1s / 284.8 eV||1|
|GaCl3||1119.85||21.91||C 1s / 284.8 eV||1|
|GaBr3||1119.45||21.48||C 1s / 284.8 eV||1|
|GaI3||1119.17||21.06||C 1s / 284.8 eV||1|
|Ga2I4||1118.72||20.80||C 1s / 284.8 eV||1|
|Ga2Cl4||1119.54||21.77||C 1s / 284.8 eV||1|
Table 1: Binding energies (EB) for some common gallium species
- 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.