Comment on ''Quantum-mechanical equivalent-photon spectrum for heavy ion physics''

We critically discuss the recently developed quantum-mechanical equivalent photon spectrum by Benesh {ital et al.} [Phys. Rev. C {bold 54}, 1404 (1996)]. We point out that the key point, the strong absorption in heavy ion collisions, is not treated adequately. Conclusions drawn from such a spectrum are invalid. Equivalent-photon spectra appropriate for heavy ions have been given before in quantal, as well as semiclassical versions, and were found to be very satisfactory. {copyright} {ital 1997} {ital The American Physical Society}