This group allows you to probe a potential energy surface along a grid of points. The scan can be made for any SCFTYP, or for the MP2 or CI surface. IVEC1 = an array of two atoms, defining a coordinate from the first atom given to the second. ... DISP1 = step size for the coordinate. ... Press to view sample input file for GAMESS (US) style relaxed scans using DLCs . ... Download Firefly-specific samples on scans over internal coordinates using DLCs . ... New MP2 gradient code documentation . ...