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Frequency calculations for QM, MM and multi-level QM/QM and QM/MM schemes

Fully operational calculation of the Hessian in case of multi-level schemes, where for each description either an analytical or numerical setup can be chosen. This can be applied automatically for either QM calculations, MM calculations, or multi-level QM/MM or QM/QM calculations (including spin-contamination corrections). A full summary of the important thermodynamic properties (enthalpy at 0K and 298K, entropy, Gibbs free energy) is reported in the output, for instance:

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                   S U M M A R Y    O F    E N E R G Y    T E R M S
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Pauli Repulsion:              1.234817178116662     33.6011       774.86      3242.01
Electrostatic Interactions:  -0.238553103747176     -6.4914      -149.69      -626.32
Orbital Interactions:        -1.496489120691529    -40.7215      -939.06     -3929.03
Quild Bonding Energy:        -0.500224957131303    -13.6118      -313.90     -1313.34
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Zero-Point Energy:            0.020896706726649      0.5686        13.11        54.86
Enthalpy H            (0K):  -0.479328250404654    -13.0432      -300.78     -1258.48
d(Enthalpy H)  (0 => 298K):   0.002837412889686      0.0772         1.78         7.45
Enthalpy H          (298K):  -0.476490837514968    -12.9660      -299.00     -1251.03
-T*S                (298K):  -0.021452035100450     -0.5837       -13.46       -56.32
Gibbs-free-energy   (298K):  -0.497942872615418    -13.5497      -312.46     -1307.35
##########################################################################################
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