  The total photodetachment cross section of a linear triatomic negative ion
using plane polarized laser light parallel to the axis of the molecular ion is
derived. The cross section shows strong oscillations in contrast to the
recently reported case, where the laser polarization was perpendicular to the
axis of the triatomic molecular ion (Appl. Phys. Lett. 94, 041125, 2009).
Closed orbit theory is used to explain these oscillations and the results are
compared with a diatomic molecule.
