SEARCH Articles Figures Tables Appearance Appearance Potential X-Ray Appearance potential Potential Spectroscopy Soft X-ray appearance potential Soft X-ray appearence potential spectroscopy Soft X-ray appearence potential spectroscopy Soft X-ray appearence potential spectroscopy SXAPS) Soft appearance potential spectroscopy Soft potential Soft x-ray appearance potential spectroscopy SXAPS Spectroscopy appearance potential X potential