Abstract
The calcium $K$ x-ray absorption spectrum of Ca${\mathrm{F}}_{2}$ has been obtained with a 50-cm bent-quartz-crystal vacuum spectrograph. The obtained spectrum shows a clear edge structure. This structure has been discussed on the basis of the energy-band-structure calculation by Albert et al. A small peak observed near the calcium $K$ threshold is situated about 3.2 eV below the bottom of the conduction band whose position has been determined by use of the data on the Ca $K{\ensuremath{\beta}}_{5}$ emission band and the optical band gap of Ca${\mathrm{F}}_{2}$. The origin of this peak is discussed in relation to a core exciton.
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