How do I combine multiple Gaussian jobs within a single input file ?
Multiple Gaussian calculations can be combined using the Link 1 command. To combine multiple-step jobs, separate the input for each successive job from that of the preceding job by the separator line: %Chk = frequency #B3LYP/6-31G(d,p)  Freq Frequency Calculation on XYZ at STP 0 1 . . . –Link1– %Chk = frequency #B3LYP/6-31-G(d,p)  Geom=Checkpoint  Guess=Read  Freq=(ReadFC,ReadIsotopes) Frequency Calculation on XYZ at Elevated Temperature 0 1 450.0 1.0 Note that a blank line must be included between the last line of the first job and the –Link 1– separator line. Failure to include a blank line will result in a segmentation violation error when the Gaussian job is run. Note also that if the checkpoint file from the first job is to be used in a subsequent job, the names specified with the %Chk command in the Link 0 section of each job must be identical. Otherwise, the second job will not be able to find the checkpoint file from the first job, which will cause the secon
