21. A number of things can be done here: masses of atoms can be changed (option Am)  and frequency/normal modes recalculated (option Ei). Then using Sa one can look at all normal modes  - no care is now taken of whether they belong to one or another irrep. This is given in long tables and may take several screens, see below for our case:

20.  So far we used only option V2 of the main menu to work vibrations. It is good for looking at all modes by irreps, however, it has a rather limited functionality. Let us now try another option from the main menu instead: after run_DFT_script finished, enter the main menu and then type V3:

Clearly, the same frequencies appear as when using the option V2 of the main menu (for degenerate frequencies the eigenvectors may however look different as they will be intermixed).

22.  Similarly to V2, the vibrational free energy can also be calculated (option Fr with setting in Np and Tr).

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