I want to calculate RDG colour plot with VDW effect and 2D graphical plot to observe the non-covalent interactions like hydrogen bond, steric effect and van der Waalls forces in Multiwfn software. Then, what is the keyword to be used in input file to generate the output file in Gaussian? From the output file of gaussian, I will generate the input file for Multiwfn.
As Debasish Mandal mentioned, you can directly use .fch as input file, in this case no any additional keyword is required, and in fact this is the simplest way of generating input file of Multiwfn for Gaussian users. More information about input file of Multiwfn can be found in Section 2.5 of Multiwfn manual, and the way of generating them can be found in the beginning of Chapter 4 of the manual.
Probably you may need the wavefunction file (Keyword: output=wfn and a file name.wfn at the end) to see non-covalent interactions in multiwfn. Multiwfn also read the formatted checkpoint files.
As Debasish Mandal mentioned, you can directly use .fch as input file, in this case no any additional keyword is required, and in fact this is the simplest way of generating input file of Multiwfn for Gaussian users. More information about input file of Multiwfn can be found in Section 2.5 of Multiwfn manual, and the way of generating them can be found in the beginning of Chapter 4 of the manual.
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