## Comment on 'Photodetachment of H{sup -} in a static electric field near an elastic wall'

In a recent theoretical study on the photodetachment cross section of H{sup -} in a static electric field near an elastic wall, Yang et al. found significant difference between the result of closed-orbit theory and a quantum approach [Phys. Rev. A 73, 043413 (2006)]. They attributed the difference to the semiclassical approximations in closed-orbit theory. We have examined the application of closed-orbit theory to the same problem and found the disagreement is caused by the incorrectly assigned phases and amplitudes associated with closed-orbits. After the phases and amplitudes are corrected, the closed-orbit theory is shown to be in excellent agreementmore »