:term:`CFOUR_SPINROTATION <CFOUR_SPINROTATION (CFOUR)>`
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      Specifies whether nuclear spin-rotation tensors are computed within a NMR chemical shift calculation (ON, =1) or not (OFF, =9). In the case of electronic g-tensor calculations for open-shell molecules this keyword controls the calculation of the electronic spin-rotation tensor.

      * **Type**: :ref:`boolean <op_c_boolean>`
      * **Default**: false