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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 
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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