A Comment on the Letter by Frédéric Fournier et al., Phys. Rev. Lett. 92, 216102 (2004). The authors of the Letter offer a reply.

doi.org/10.1103/physrevlett.93.249601
Phys. Rev. Lett.

Roeterdink, W. G., Backus, E., Kleyn, A. W., & Bonn, M. (2004). Comment on "Ultrafast laser excitation of CO/Pt(111) probed by sum frequency generation: coverage dependent desorption efficiency". Phys.Rev.Lett., 93(24, Article number: 249601), 1–1. doi:10.1103/physrevlett.93.249601