Photodetachment of H- in a quantum well

The photodetachement of H- in a quantum well is investigated based on closed orbit theory. It is found the distances between the ion and the two hard walls modulate the cross section of photodetachment. For the hard walls perpendicular the polarization of photons, the detachment spectrum displays a staircase structure. The pattern of staircase is modulated by the ratio of distances from the ion to the two walls while the distance controls step interval of the staircase structure.