LINESHAPE, LINEWIDTH AND SPECTRAL DENSITY OF PARAMETRIC X-RADIATION AT LOW ELECTRON-ENERGY IN DIAMOND

Applying an absorber technique, the experimental shape and width of a parametric x-radiation line has been determined. The 9 keV radiation w as produced by bombarding a diamond crystal of 55 mu m thickness with electrons of 6.8 MeV. The variance of the spectral line distribution w as found to depend on the tilt angle of the crystal and to have a magn itude of sigma=51 eV. Simulations based on a Monte Carlo method exhibi t that the observed variance is mainly influenced by multiple scatteri ng of electrons passing through the crystal (approximate to 43 eV) and the finite detector opening (approximate to 18 eV), leaving for the i ntrinsic linewidth a value of the order of 1 eV. The spectral density of the Line was found to be J approximate to 10(-7) photons/(electronx srxeV). (C) 1997 American Institute of Physics.