TEST SOLUTION OF THE INVERSE PROBLEM FOR THE DETERMINATION OF PAIR CORRELATION-FUNCTION IN THE SECONDARY-ELECTRON EXTENDED FINE-STRUCTURE TECHNIQUE

A spectrum of the secondary electron extended fine structure (SEFS) ab ove the M2,3VV Auger line of a Cu (111) single crystal has been obtain ed. The solution of an inverse problem has been calculated for the exp erimental SEFS spectrum and the pair correlation function (PCF) has be en obtained by Tikhonov's regularization method. Parameters for the ne arest atomic environment, namely, the bond length and the asymmetry pa rameter of the PCF first peak, have been determined. A comparison of r esults obtained with available data and those obtained by other method s allows us to conclude that this setting of the inverse problem and t he integral operator kernel parameters selected can be used for the ex perimental determination of PCF for both single-component and more com plicated matter. (C) 1998 Elsevier Science B.V.