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NIST X-ray Photoelectron Spectroscopy Database (SRD 20), Version 5.0
Reliable (reported energy within 300 eV of a reference energy)
Comment:
Undoped Ge(111) was cleaned by Ar+ ion bombardment and annealed until a sharp c(2x8) LEED pattern emerged. Singularity index = 0.1. Branching ratio = 0.67.