  We illustrate some of the difficulties that may be encountered when computing
photodissociation and radiative association cross sections from the same
time-dependent approach based on wavepacket propagation. The total and partial
photodissociation cross sections from the thirty-three vibrational levels of
the b triplet {\Sigma}+ state of HeH+ towards the 9 other triplet {\Sigma}+ and
6 triplet {\Pi} n = 2, 3 higher-lying electronic states are calculated. The
corresponding radiative association cross sections are extracted from the same
calculations, and the photodissociation and radiative association rate
constants are determined.
