Abstract
The first definitive measurements of EXAFS by monitoring the direct photoelectron emission as a function of photon energy have been made using the Mn 3p and F 2s core levels in evaporated films of MnF2 [1,2]. Good agreement is found with bulk transmission EXAFS obtained with the Mn Is level. This development is important because: (1) Almost all elements have suitable core levels of low binding energy. (2) Since photopeaks from adjacent core levels do not cross as the photon energy is varied, the limitation imposed on other EXAFS techniques by this interference is removed. Auger electrons, which have fixed kinetic energies and so can cross photo-peaks, will generally have low energies if they originate from the outer core levels and be unlikely to appear in the EXAFS region of kinetic energies, i. e., in excess of about 50 eV. (3) VUV light is used, which greatly extends the useable range of photon energies. (4) More than one element in a solid may be studied with the same monochromator.
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