VisRes: a GRACE tool for displaying and analysing resonances

VisRes is a graphical tool for displaying and analysing resonance data. Fil es of eigenphase sums, generated during the computation of electron and pho ton interactions with atoms and molecules, can be read and the data display ed both as continuous and discontinuous graphs. Resonance resolution can be improved by interactively computing additional data points and merging the m with the displayed data. Resonance positions and widths are determined by fitting user selected data points by the Breit-Wigner formula. VisRes is w ritten in C and Motif for the UNIX operating system. It can be operated exc lusively on the host workstation or in distributed mode where data is read from and computed on a remote computer but displayed and analysed on the ho st workstation. While it is published as a stand-alone tool, VisRes also fo rms part of the Graphical R-matrix Atomic Collision Environment (GRACE). (C ) 1998 Elsevier Science B.V.