N. Zema et al., SPECTROSCOPIC BEHAVIOR OF HALOGEN PHOTODESORPTION FROM ALKALI-HALIDESUNDER UV AND VUV EXCITATION, Physical review. B, Condensed matter, 55(8), 1997, pp. 5448-5454
The photostimulated desorption yield of neutral halogen atoms from KI,
KBr, and RbI at several temperatures has been measured in the photon
energy range between 5 and 30 eV using synchrotron radiation and quadr
upole mass spectrometry. The features observed in the desorption yield
are slightly correlated with the structures of the absorption spectra
of each investigated material. The behavior of the halogen desorption
yield is analyzed in the frame of inelastic electron-electron scatter
ing processes, in close analogy with data available from the total pho
toelectron yield and the luminescence yield. The role played in the de
sorption mechanism by fundamental excitations, such as valence exciton
creation and band-gap electron-hole excitation, is discussed.