LBONE: Difference between revisions
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{{TAGDEF|LBONE|.TRUE. {{!}} .FALSE. | .FALSE.}} | {{TAGDEF|LBONE|.TRUE. {{!}} .FALSE. | .FALSE.}} | ||
Description: | Description: {{TAG|LBONE}} calculates the two-center contributions to the chemical shift tensor. | ||
---- | ---- | ||
{{TAG|LBONE}} switches on two-center contributions to the NMR chemical shift tensor. | {{TAG|LBONE}} switches on two-center contributions to the NMR chemical shift tensor. | ||
These are contributions | These are contributions due to the augmentation | ||
currents in other PAW spheres than the sphere with the atom for which the shift tensor is calculated. | currents in other PAW spheres than the sphere with the atom for which the shift tensor is calculated. | ||
Typically these contributions are safely neglected. | Typically these contributions are safely neglected. | ||
It makes sense to include them for accurate calculations with hard potentials (*_h) | It makes sense to include them for accurate calculations with hard potentials (<tt>*_h</tt>) | ||
on systems containing (non-hydrogen) atoms from the top rows of the periodic | on systems containing (non-hydrogen) atoms from the top rows of the periodic | ||
table (B, C, N, O, F), typically with short bonds, e.g. | table (B, C, N, O, F), typically with short bonds, e.g. C<sub>2</sub>H<sub>2</sub>, where | ||
effects up to a few ppm are possible. For such systems using standard potentials | effects up to a few ppm are possible. For such systems using standard potentials | ||
typically introduces larger inaccuracies. The two-center contributions are calculated using | typically introduces larger inaccuracies. The two-center contributions are calculated using | ||
Revision as of 16:54, 13 July 2017
LBONE = .TRUE. | .FALSE.
Default: LBONE = .FALSE.
Description: LBONE calculates the two-center contributions to the chemical shift tensor.
LBONE switches on two-center contributions to the NMR chemical shift tensor. These are contributions due to the augmentation currents in other PAW spheres than the sphere with the atom for which the shift tensor is calculated. Typically these contributions are safely neglected. It makes sense to include them for accurate calculations with hard potentials (*_h) on systems containing (non-hydrogen) atoms from the top rows of the periodic table (B, C, N, O, F), typically with short bonds, e.g. C2H2, where effects up to a few ppm are possible. For such systems using standard potentials typically introduces larger inaccuracies. The two-center contributions are calculated using a multipole expansion of the current density that is represented on the plane wave grid.[1]