Navigation : 
        
          
    
   Manual 
    
   Input Variables  
    
  - 
   Atomic Orbitals 
    
  - 
   Calculation Modes 
    
  - 
   ClassicalParticles 
    
  - 
   DFTBPlusInterface 
    
  - 
   Execution 
    
  - 
   Hamiltonian 
    
  - 
   Linear Response  
    
  -- 
   Casida  
      --- CasidaCalcForces 
      --- CasidaCalcForcesKernel 
      --- CasidaCalcForcesSCF 
      --- CasidaCalcTriplet 
      --- CasidaDistributedMatrix 
      --- CasidaHermitianConjugate 
      --- CasidaKohnShamStates 
      --- CasidaKSEnergyWindow 
      --- CasidaMomentumTransfer 
      --- CasidaParallelEigensolver 
      --- CasidaPrintExcitations 
      --- CasidaQuadratureOrder 
      --- CasidaTheoryLevel 
      --- CasidaTransitionDensities 
      --- CasidaWeightThreshold 
      --- CasidaWriteDistributedMatrix 
      --- PhotonmodesFilename 
  
    
  -- 
   KdotP 
    
  -- 
   Polarizabilities 
    
  -- 
   SCF in LR calculations 
    
  -- 
   Solver 
    
  -- 
   Static Polarization 
    
  -- 
   Sternheimer 
    
  -- 
   Vibrational Modes 
      -- MagneticGaugeCorrection 
      -- ResponseMethod 
  
    
  - 
   Math 
    
  - 
   Maxwell 
    
  - 
   MaxwellStates 
    
  - 
   Mesh 
    
  - 
   Output 
    
  - 
   SCF 
    
  - 
   States 
    
  - 
   System 
    
  - 
   Time-Dependent 
    
  - 
   Utilities 
    
  - 
   Alphabetic Index 
  
    
   Tutorials 
    
   Developers 
    
   Releases 
         
       
    
    
    CasidaMomentumTransfer 
    
    
    
    
CasidaMomentumTransfer 
Section  Linear Response::Casida  
Type  block 
Default  0 
 
Momentum-transfer vector for the calculation of the dynamic structure
factor. When this variable is set, the transition rates are determined
using an exponential operator instead of the normal dipole one.
 
    
         
        
        
        
        Source information
        
         
    
    
main/casida.F90  : 399
 if  ( parse_block ( sys % namespace ,  'CasidaMomentumTransfer' ,  blk ) == 0 )  then