Reference.Variables.hamilt.nip

Variable "hamilt.nip" in the Matlab/Octave version of WavePacket

Available negative imaginary potential classdef's (used as absorbing boundary conditions) and their settable properties are given in the following table. Note that you can find the complete list by looking into the corresponding package folder.

nip.power	Uses a power function as NIP outside of an interval. The functional form of the potential is iΘ(r-rmax) (r-rmax)N + iΘ(rmin-r) (rmin-r)N where Θ is the Heavyside function. All parameters are arrays whose ''n''-th element give the values along degree of freedom ''n''.
exp	Array of exponents N to be used.
min	Array of lower boundaries rmin for the non-absorbing region.
max	Array of upper boundaries rmax for the non-absorbing region.

For a more in-depth explanation of how to optimally choose the grid parameters, along with a discussion of different boundary conditions in WavePacket, the interested reader is referred to our Wiki page on Fourier grid representations and absorbing boundary conditions.