Navigation : Manual Input Variables - Atomic Orbitals - Calculation Modes - ClassicalParticles - DFTBPlusInterface - Execution - Hamiltonian - Linear Response -- Casida -- KdotP --- KdotPCalcSecondOrder --- KdotPCalculateEffectiveMasses --- KdotPEta --- KdotPOccupiedSolutionMethod --- KdotPUseNonLocalPseudopotential --- KdotPVelMethod -- Polarizabilities -- SCF in LR calculations -- Solver -- Static Polarization -- Sternheimer -- Vibrational Modes -- MagneticGaugeCorrection -- ResponseMethod - Math - Maxwell - Mesh - Output - SCF - States - System - Time-Dependent - Utilities - Alphabetic Index Tutorials Developers Releases KdotPVelMethod A - B - C - D - E - F - G - H - I - K - L - M - N - O - P - Q - R - S - T - U - V - W - X KdotPVelMethod Section Linear Response::KdotP Type integer Default grad_vel Method of velocity calculation. Options: grad_vel: −i(∇+[r,Vnl])-i \left(\nabla + \left[r, V_{\rm nl} \right] \right)−i(∇+[r,Vnl]) hcom_vel: As a commutator of the position operator and Hamiltonian, −i[r,H]-i \left[ r, H \right]−i[r,H]. Source information electrons/perturbation_kdotp.F90 : 134 call parse_variable(namespace, 'KdotPVelMethod', OPTION__KDOTPVELMETHOD__GRAD_VEL, this%vel_method)