ABSOLUTE PHOTOABSORPTION MEASUREMENTS OF MOLYBDENUM IN THE RANGE 60-930 EV FOR OPTICAL-CONSTANT DETERMINATION

Transmission measurements for the optical constants delta, beta of the complex refractive index n = 1 - delta + i beta of molybdenum are per formed in the energy range 60-930 eV. Free-standing C/Mo/C foils of fi ve different thicknesses are used, and the results are normalized for the presence of the carbon layers in the samples. These absorption res ults are combined with previous experimental data in the lower energy range and values from the atomic tables to obtain the imaginary (absor ptive) part of the refractive index for molybdenum in the range 1-30,0 00 eV. The real (dispersive) part of n was calculated from Kramers-Kro nig analysis with the above absorption data. An evaluation with the pa rtial sum rules demonstrates that this new compilation provides an imp roved set of values for n, covering a wider energy range compared with the current tabulated values. The new results are applied sc as to ca lculate the normal-incidence reflectivities of Mo/Si and Mo/Be multila yer mirrors. (C) 1998 Optical Society of America.