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4.10 Extended Tight-Binding Methods (xTB)

4.10.3 Examples

(July 4, 2026)

Example 4.30  xTB single-point calculation.

$molecule
0 1
Li      0.0000000000    0.0000000000    0.0000000000
H       0.0000000000    0.0000000000    1.6000000000
$end

$rem
JOBTYPE           SP
METHOD            XTB
SCF_ALGORITHM     DIIS
SCF_CONVERGENCE   6
$end

Example 4.31  xTB geometry optimization.

$molecule
0  1
H      -1.21420     3.05899     0
Li     -2.89084     3.09033     0
$end

$rem
JOBTYPE           OPT
METHOD            XTB
BASIS             XTB
SCF_ALGORITHM     DIIS
SCF_CONVERGENCE   5
XTB_FERMI_TEMP    300
$end