gausssum parses the output file of a Gaussian, GAMESS or HyperChem computational chemistry job to extract
useful information. It uses gnuplot(1) to graphically display of the output. GaussSum can do the
following: (Gau=Gaussian, GAM=GAMESS, Hyp=HyperChem)
• display all lines containing a certain phrase (any)
• follow the progress of the SCF convergence (Gau,GAM)
• follow the progress of a geometry optimisation (Gau,GAM)
• extract molecular orbital information, including contributions of groups of atoms to the molecular
orbitals (Gau,GAM)
• plot the density of states spectrum (and the partial density of states, in the case of groups of
atoms) (Gau,GAM)
• plot the crystal orbital overlap population (COOP) spectrum, which gives information on the
bonding/anti-bonding nature of an overlap between atoms/groups (Gau,GAM)
• extract information on the UV-Vis transitions (Gau,Hyp), including the change in the charge
density of groups of atoms (Gau)
• plot the UV-Vis spectrum (Gau,Hyp) and the circular dichroism spectrum (Gau)
• automate the creation of electron density difference maps, which visually show the change in
charge density associated with a given electronic transition (Gau)
• extract information on IR (Gau,GAM) and Raman vibrations (Gau)
• plot the IR and Raman spectra, which may be scaled using general or individual scaling factors
(Gau)