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+ Physical chemistry
Posted by
Laurence Konersman

Electron density calculation - ORCA

Derek Hendricks  Follow
ORCA prints Mulliken gross atomic charge - a partial charge which atom have. This is some quantitative information (for example +0,36 on C and -0,46 on O at -C=O in CH3-CH2-CHO).

However this doesn't give any information about localisation of charge at space.

Even if program would print that sort of information - 0,001 e- at x y z, and 0,002 e- at x y z+0,001 - imagine how hard it would be to read it.

I mean - it is possible - for example - N in pirydine lies in center (x, y, z = 0) and orbital σ (the one which is non-bonding) lies straight in z direction, but - it will be harder for other compounds.

I found that command "KeepDens" prints some information about electron density in separate (.scfp) file, but this is bunch of random letters.

How to really print it, I don't know since I used this program only few times.

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