Orbitals and Energies #
Note – these are listed in BINDING ENERGY
Ne 1s ≈ 686 eV
Ne 2s ≈ 45 eV
Ne 2p ≈ 18 eV
Doublet Separations #
No significant non S-orbitals
Common Overlaps for Ne 1s #
Ni 2p– Te 3p – La LMM (Al Ka X-rays)
Theory and Background #
Noble gases do not tend to be analysed by XPS due to low reactivity, and volatility. There are a number of studies, however, on implanted ions in various substrates.
Experimental Advice #
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Data Analysis Guidance #
Studies of implanted noble gas ions found line broadening for all implanted gases, but line asymmetry was observed only for Ne 1s electrons implanted in Cu, Ag, and Au.[1]The authors concluded that this asymmetry was not due to core-hole lifetime effects (Auger broadening, etc.), but rather due to multiple implantation sites — in particular, the formation of small neon clusters inside the metal lattice. In such clusters, the screening of the Ne 1s core hole by conduction electrons is less effective than for isolated Ne atoms in substitutional sites. That reduced screening means some Ne atoms exhibit a higher apparent binding energy, producing the asymmetric tail at higher binding energy.
References #
- Citrin, P. H., and D. R. Hamann. “Measurement and calculation of polarization and potential-energy effects on core-electron binding energies in solids: X-ray photoemission of rare gases implanted in noble metals.” Physical Review B 10.12 (1974): 4948.
