PHOTOEMISSION MEASUREMENT ON NACL IN PHOTON ENERGY RANGE 32-50 EV

Photoemission measurements with photon energies ranging from the onset of Na 2p electron absorption to 50 eV have been performed using synchrotron radiation as a light source. The results indicate that the rise in the absorption coefficient starting at about 8.5 eV above the onset of 2p electron transitions is due to continuum transitions, whereas in the region below, most of the structures turn out to be exciton excitations. © 1969 The American Physical Society.