. . . "X-ray absorption spectroscopy" . "resonant absorption edge" . . . . . . . "X-ray absorption spectroscopy (XAS)" . . "X-ray absorption Spectroscopy" . . . "X-ray absorption" . "X-ray Absorption Spectroscopy (XAS)" . . . "X-ray Absorption Spectroscopy" . . . "x-ray absorption spectroscopy" . "absorption" . "x-ray absorption" . "X-Ray absorption spectroscopy (XAS)" . . . "X-ray absorption spectroscopy" . "XAS" . .