dft calculation yet output with no exchange-correlation energy?!


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The following in the input file,

echo

start HZ

title "HZ with fractional nuclear charge by nwchem"

geometry units angstroms
Bq_H 0.0000 0.00000000 0.00000000 charge 1.0000
H 0.7500 0.00000000 0.00000000
end

charge     0.0000

basis
Bq_H library H 6-311g**
H library 6-311g**
end

dft
mulliken
print "mulliken ao"
xc xpbe96 cpbe96
end

task dft


Here is the converged energy output:

        Total DFT energy =       -0.540227841742
One electron energy = -2.311763270508
Coulomb energy = 1.065965763433
Exchange-Corr. energy = 0.000000000000
Nuclear repulsion energy = 0.705569665333

Numeric. integr. density = 0.000000000000

Meanwhile, the total energy does not seem to be quite right. Total energy should be < -2 Ryd, about - 1 Hartree. But here it only reports -0.54Har. Is this the case?