Dear Wien2k authors and users I’m interested to calculate total, Coulomb, and XC potential using wien2k code. I performed the scf calculations using B3PW91 with alpha=0.2 using following command:
runsp_lapw -p -so -eece -in1ef -i 900 -cc 0.00001 Then I used lapw5 to calculate the potentials using the following case.in5: 0 0 10000000 10000000 10000000 0 10000000 10000000 0 10000000 10000000 10000000 3 2 3 1000 1000 RHO ADD ATU VAL NODEBUG ORTHO Then I used x lapw5 –d command and edit the lapw5.def as follows and run lapw5 lapw5.def For total potential: 5 ,'Case.in5', 'old', 'formatted',0 6 ,'Case.output5', 'unknown','formatted',0 8 ,'Case.struct', 'old', 'formatted',0 9 ,'Case.vtotal', 'old', 'formatted',0 10,'Case.tmp', 'unknown','unformatted',0 11,'Case.vtotaldn', 'unknown','formatted',0 12,'Case.sigma', 'unknown','formatted',0 20,'Case.rho_onedim','unknown','formatted',0 21,'Case.rho', 'unknown','formatted',0 For Coulomb potential: 5 ,'Case.in5', 'old', 'formatted',0 6 ,'Case.output5', 'unknown','formatted',0 8 ,'Case.struct', 'old', 'formatted',0 9 ,'Case.vcoul', 'old', 'formatted',0 10,'Case.tmp', 'unknown','unformatted',0 11,'Case.vcoul', 'unknown','formatted',0 12,'Case.sigma', 'unknown','formatted',0 20,'Case.rho_onedim','unknown','formatted',0 21,'Case.rho', 'unknown','formatted',0 And for XC potential: 5 ,'Case.in5', 'old', 'formatted',0 6 ,'Case.output5', 'unknown','formatted',0 8 ,'Case.struct', 'old', 'formatted',0 9 ,'Case.r2v', 'old', 'formatted',0 10,'Case.tmp', 'unknown','unformatted',0 11,'Case.r2vdn', 'unknown','formatted',0 12,'Case.sigma', 'unknown','formatted',0 20,'Case.rho_onedim','unknown','formatted',0 21,'Case.rho', 'unknown','formatted',0 I expected that the range of Coulomb potential must be very higher than XC potential and XC term is very little. However, after potential calculations I saw that between atoms the range of Coulomb potential is very close to XC potential. A small positive Coulomb potential and small negative XC potential leads to the very small negative total potential. Could you help me please to know that whether are my calculations true or not? Is this correct that XC and Coulomb terms are in the same range?
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