J. Chem. Phys. 92, 817 (1990); https://doi.org/10.1063/1.458393 92, 817 © 1990 American Institute of Physics. Comment on ‘‘A perturbation–trajectory method for the study of gas–surface collision dynamics’’ Cite as: J. Chem. Phys. 92, 817 (1990); https://doi.org/10.1063/1.458393 Submitted: 28 August 1989 • Accepted: 13 September 1989 • Published Online: 31 August 1998 Merle E. Riley, Michael E. Coltrin, Dennis J. Diestler, et al.