Back to the main page of this manual  Input reference of CP2K version 2023.2 
CP2K_INPUT /
FORCE_EVAL /
DFT /
EFIELD
ENVELOP {Keyword} 

Shape of the efield pulse used in realtime propagation (RTP) calculations.  
This keyword cannot be repeated and it expects precisely one keyword.  
Default value:
CONSTANT 

List of valid keywords:

INTENSITY {Real} 

Intensity of the electric field. For realtime propagation (RTP) units are in W*cm2 which corresponds to a maximal amplitude in a.u. of sqrt(I/(3.50944*10^16)). For a constant local field in isolated system calclulations, units are in a.u..  
This keyword cannot be repeated and it expects precisely one real.  
Default value:
0.00000000E+000 
PHASE {Real} 

Phase offset of the cosine given in multiples of pi. Used in realtime propagation (RTP) calculations.  
This keyword cannot be repeated and it expects precisely one real.  
Default value:
0.00000000E+000 
POLARISATION {Real} {Real} {Real} 

Polarisation vector of electric field  
This keyword cannot be repeated and it expects precisely 3 reals.  
Default values:
0.00000000E+000 0.00000000E+000 1.00000000E+000 
VEC_POT_INITIAL {Real} {Real} {Real} 

Initial value of the vector potential (for velocity gauge). This input is made especially for restarting RTP calculation. Unit is atomic unit. Note that if several field sections are defined, only the first one will be used.  
This keyword cannot be repeated and it expects precisely 3 reals.  
Default values:
0.00000000E+000 0.00000000E+000 0.00000000E+000 
WAVELENGTH {Real} 

Wavelength of efield field for realtime propagation (RTP) calculations.  
This keyword cannot be repeated and it expects precisely one real.  
Default value:
0.00000000E+000 

Default unit:
[nm]

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