[Pw_forum] Help me to solve a problem in Charge Density Difference calculation using Quantum Espresso

stefano de gironcoli degironc at sissa.it
Sat Aug 12 16:29:44 CEST 2017

you need to compute the three charges with the same parameters


On 12/08/2017 16:20, Bibhas Manna wrote:
> Dear All,
> I am very new to Quantum Espresso. I want to get a charge density 
> difference plot for a gas molecule adsorbed on the single layer 
> graphene surface. Presently I am using pp.x to compute the same in QE 
> v.5.1 following an equation:
>     ∆ρ=ρAB – ρA-ρB
> Where, ρAB, ρA and ρB are the charge densities of graphene -molecule 
> complex, graphene and molecule respectively. I have successfully 
> computed all of these three charge densities using pp.x. Now, I am 
> trying to find out the charge density difference using pp.x with nfile 
> = 3, while all of these three charge files are available to me as inputs.
> Unfortunately, I got an error in the output log: *Error in routine 
> chdens (1):
>  incompatible gcutm or dual or ecut*
> Since, I have different number of atoms in each of the three files, 
> how can I make the charge files having same number of atomic coordinates?
> I am sharing my input and output files for your kind considerations.
> Can you help me to solve this problem?
> Thanks with regards,
> Bibhas Manna
> Research Scholar,
> IIT Kharagpur, India
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