Dear colleagues, 

I am a Geochemist. I used prog ORTEP on windows, 20 years ago.  Now I w'd like to use Ortep on mac  but I am unable to calculate the bond length of a compound   from unit cell, fractional coordinates of atoms and space group. 

I don't know to proceed computation with the new version. Is somebody can explains me the procedure for the introduction of files (spatial group and lattice parameters) to obtain bond lengths between different atoms?  Can anyone  provides me a complete description of the program or another software?

Thanks.

Vieillard Philippe

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