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This article explores methods to include external basis sets and pseudopotentials in Gaussian, indicating the impact on DFT calculations.
I am frequently asked how to include an extra set of basis functions in a calculation or how to use an entirely external basis set. Sometimes this question also implies the explicit declaration of an external pseudopotential or Effective Core Potential (ECP). New basis sets and ECPs are published continuously in specialized journals all the time. The same happens with functionals for DFT calculations.
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Joaquin Barroso (2011) studied this question.
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