Abstract
ESCA spectra of lunar soil and crushed rock samples are compared to previously obtained Auger spectra of the same samples. The ESCA data confirm the increase of Fe concentration on the surface of soil samples vs. their bulk Fe content; and strongly support the existence of layers on the surfaces of lunar soil grains which are significantly enriched in Fe, some of which is in the Fe° state. The significance of the ESCA information on the major elemental composition of lunar soil grain surfaces for the understanding of the processes that affect the state of the regolith is discussed.
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