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Questions tagged [free-software]

For questions asking for recommendations of matter modelling softwares available at no cost.

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12 votes
2 answers
817 views

Is there some free software to do Frank-Condon analysis?

I know Gaussian 16 can do it, but are there some free programs that can? For simple excited state calculations using TD-DFT, we can use NWChem and Octopus. Can these do Franck-Condon factors?
user779130's user avatar
12 votes
2 answers
211 views

Are there any free or free quantum chemistry codes which can apply an external field gradient?

I wanted to apply a field gradient on my molecule and study some associated property. I'm able use MM point charges w.r.t a QM/MM scheme of doing things to produce a field gradient. But I was ...
Atom's user avatar
  • 1,115
9 votes
1 answer
468 views

Why is the planewave codes ecosystem healthier on free/opensource software adoption, when compared to codes supporting atom-centered orbitals?

Regarding the branch of matter modeling that deals with electronic structure methods, I think we can divide it in two camps: Those who work mostly with planewave-based software, geared towards ...
ksousa's user avatar
  • 4,148
3 votes
1 answer
236 views

Rendering Vector Graphics Images

I am trying to render few representative structures for molecules. The requirement for the images is as follows: (1) It must be vector graphics, and (2) Atom colorings must intuitively make sense (...
Hemanth Haridas's user avatar