Recent development in the study of optical properties of solids in XUV, i. e. the region between 10 and 10
3 eV by means of synchrotron radiation is reviewed. Absorption spectra for Cl
-L
2, 3 of alkali chlorides, AgCl, and TlCl, S
-L
2, 3 of CdS, Na
+L
2, 3 of sodium halides, Li
+K of lithium halides observed either by INS-SOR, Tokyo, or DESY, Hamburg are presented, in which the emphasis is placed upon the exciton problems. After giving a brief summary of observations on the plasma resonance in Al, some characteristic behaviors of metals in XUV are discussed in terms of realistic, or non-hydrogenic potentials for electrons at the intermediate shells in the atom. Problems encountered in determining the optical constants in XUV are also discussed and a few techniques which seem feasible in this region, namely, the self-consistent Kramers-Kronig analysis of μ and R through the entire region of the spectrum and the analysis of reflectances measured at totally reflecting angles, are mentioned.
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