High resolution X-ray spectroscopy in fast electron transport studies per Koester, P, Booth, N, Cecchetti, C, Chen, H, Evans, R, Gregori, G, Labate, L, Levato, T, Li, B, Makita, M, Mithen, J, Murphy, C, Notley, M, Pattathil, R, Riley, D, Woolsey, N, Gizzia, L