RT-TDDFT Propagation Direction

[Lillian Smith]

Hello!

I am currently using RT-TDDFT to model laser damage in liquid crystals. One question I had was if anyone knew the direction NWChem propagates light/the beam in when doing RT-TDDFT? I am using the field type "gpulse" to model a molecule being hit by a gaussian pulse. When using the field type "gpulse," you can specify the polarization direction, x, y, or z, but not the propagation direction. Does anyone know which in direction the beam is being propagated? 

Any insights would be greatly appreciated. Thanks!