Journal of Non-Crystalline Solids 93 (1987) 423-425 North-Holland, Amsterdam 423 Letler to the Editor A NOTE ON THE FORCE FIELD TREATMENT OF AN AMORPHOUS SILICON MODEL N. TOMASSINI CNR, Isriluto Di Metodologie Avonzore Inorganiche, Area Della Ricerco Di Roma, Via Solaria Km 29.5. CP IO, 00016 Monrerotondo Scab, Italy A. AMORE BONAPASTA and A. LAPICCIRELLA CNQ Insriruro di Teoria e Struttura Elertronica e Comporromenro Spetrrochimico dei Composri di Coordinozione, Area Della Ricerco Di Rome, Via Solaria Km 29.5. CPIO. 00016 Monrerorondo SC& Imly S.L. ALTMANN and K.W. LODGE * Department of Merollurgy and Science o/ Marerials. Uniuersiry of Oxford, Park Road, Oxford OXI 3PH, UK Received 12 January 1987 Revised manuscripl received 15 April 1987 The diffraction function for amorphous silicon, computed for a Continuous Random Network is calculated and compared with experiment. The purpose of this note is to complete the treatment of the Continuous Random Network model of a-Si previously given by us [l]. At that time we did not have a program available to transform the calculated RDF into the diffraction function, which has been determined experimentally in a-Si by electron diffraction studies [2]. In a companion paper for a-Ge [3], for which a very accurate scattering intensity measured by both neutron and X-ray diffraction is available, a method has been discussed to construct the diffraction function from our calculated RDF. The results for a-Si will now be presented for the 400-atom model, discussedin ref. [l], obtained with the Lifson-Warshel Force Field and referred to in that paper with the code W400. We give in fig. 1 the experimental diffraction function F(k) from ref. [2] and the calculated one obtained as described in ref. [3]. The positions of the peaks are well reproduced, but the intensities are not so well matched as in a-Ge [3], which is probably due to the low precision of the experimental electron scattering intensity measured on an amorphous silicon film. * Present address: Department of Physics, University of Leicester. University Road, Leicester LEl 7RH. UK 0022-3093/87/$03.50 0 Elsevier Science Publishers B.V. (North-Holland Physics Publishing Division) ’