Bremsstrahlung isochromat spectroscopy

Inverse photoemission spectroscopy Bremsstrahlung isochromat spectroscopy IPES BIS 17... 

Inverse Photoemission Spectroscopy (IPES) and Bremsstrahlung Isochromat Spectroscopy (BIS)... 

The unoccupied part of the density of states can also be measured, by a technique called Inverse UPS (Sometimes also referred to as BIS, Bremsstrahlung Isochromat Spectroscopie). Here a beam of low energy electrons falls on the surface, where they go into the unoccupied states and fall back to the Fermi level, under emission of a quantum hv. Measurement of this radiation as a function of the incident electron energy gives the density of unoccupied states. This technique falls outside the scope of this book. The reader is referred to the literature [5, 44],... 

F.U. Hillebrecht and M. Campagna, Bremsstrahlung isochromat spectroscopy of alloys and mixed valent compounds 425... 

Various photoemission techniques are a powerful tool for the investigation of especially large-scale features of the occupied electronic states. Numerous photoemission data are available mainly on the uranium intermetallics. These were obtained by all possible kinds of excitations such as X-ray photoemission (XPS), ultraviolet high-resolution photoemission (UPS), or synchrotron-radiation-excited photoemission with the possibility of tuning the energy of the incident radiation. The Bremsstrahlung isochromat spectroscopy (BIS) is a probe of the empty electronic states above EF. 

FIGURE 27 The calculated f-contribution to the spectral function of Tb in the hep structure at the equilibrium volume computed within the Hubbard-I method (dashed line) compared with experiments (circles). Experimental data are X-ray photoemission and bremsstrahlung isochromat spectroscopy from Lang et al. (1981). The Fermi level is at zero energy and the dominating atomic final states are marked. 

Figure 1 A schematic diagram showing energy levels involved in techniques used to probe unoccupied density of states of a metai. XAS, X-ray absorption spectroscopy BIS, Bremsstrahlung isochromat spectroscopy I PE, inverse photoemission DAPS, disappearance potentiai spectroscopy SXAPS, soft X-ray appearance potentiai spectroscopy and AEAPS, Auger electron appearance potential spectroscopy.

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