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With MOPAC, I am trying to set up single run with geometry optimization followed by calculation of THERMOdynamic parameters.

Is there viable way for that?

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    $\begingroup$ It will surely be possible by bash scripting, but you should check the optimized structures are sensible, converged and actually the conformer you are interested in. $\endgroup$ – TAR86 Dec 31 '19 at 14:05
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OK, in between I found it, it is the GEO_DAT keyword, for example, reading in previously converged PM7 geometry of methane:

 AUX LARGE CHARGE=0 SINGLET  GEO_DAT="metan_geomopt_pm7.arc" THERMO(298,298)  PM7
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