[Pw_forum] Projection of dos on to molecular orbitals
fratesi at mater.unimib.it
Tue Jun 16 12:18:07 CEST 2015
the tool is aimed at what you are willing to do with:
"Full system" the molecule adsorbed on a surface.
"Part" the molecule in gas phase.
Statement 2) below refers to the atomic orbitals, not to the
eigenstates. This tool passes through an atomic-basis-set
representation, and the two basis sets should correspond (they describe
the same Hilbert space) so that you can make a dot product of two
vectors describing 1 the eigenstate of the full system and 2 the
eigenstate of the part.
On 15/06/2015 12:26, vasudevan m.v wrote:
> Dear QE users,
> I want to project the density of states of complete system (molecule
> adsorbed on a surface) on to molecular orbitals of adsorbate and find
> population of different molecular orbitals. If I understood correctly
> there is an post-processing tool molecularpdos.x in quantum ESPRESSO v
> 5.1.2 which does this job. If I am mistaken please correct me.
> Statement 1)
> From ..../espresso-5.1.2/PP/Doc/INPUT_molecularpdos.html
> " /Then the eigenvectors of the full system are projected onto the
> ones of the part. For example, to decompose the PDOS of an adsorbed
> molecule into its molecular orbital, as determined by a gas-phase
> I don't understand what is meant by decomposition of pdos while in first
> part it says eigenvectors of full system are used.
> Statement 2)
> "/The atomic wavefunctions identified by the ranges
> i_atmwfc_beg_full:i_atmwfc_end_full (full system) and
> i_atmwfc_beg_part:i_atmwfc_end_part (molecular part) should
> correspond to the same atomic states. See the header of the output of
> projwfc.x for more information/."
> I feel the above statement slightly confusing as in statement 1 it is
> said that "/Then the eigenvectors of the full system are projected onto
> the ones of the part/"
> Hope that things are conveyed well.
> With regards
> Vasudevan M V
Dipartimento di Fisica
Universita` degli Studi di Milano
Via Celoria 16, 20133 Milano, Italy
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