Probing three distinct iodine monolayer structures at platinum(111) by

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impulsive collision-transfer theory. The dependence upon the scattering angle is, however, the same in each case. In a typical tandem mass spectrum of a complex molecule, each fragment ion exhibits an identifiable translational energy loss,AE. Therefore provided that the fragment ion in question is formed as a result of a single collision, rather than multiple collisions, the translational energy loss, AE, can be converted, by virtue of eq 1, to a corresponding internal energy, Q. This internal energy can be properly considered to be the internal energy associated with the formationof that particular fragment ion. It is the internal energy of a decomposingion which is the key physical quantity of interest in understanding fragmentation dynamics in tandem mass spectrometry.

References and Notes (1) Uggerud, E.; Derrick, P. J. J . Phys. Chem. 1991, 95, 1430. (2) Bradley, C. D.; Curtis, J. M.; Derrick, P. J.; Wright, B. Anal. Chem. 1992,64, 2628. (3) Jarrold, M.F.; Bower, J. E. J. Chem. Phys. 1992, 96, 9180. (4) Mowrey, R. C.; Ross,M. M.; Callahan, J. H. J. Phys. Chem. 1992, 96, 4155. (5) Jarrold, M.F.; Honea, E.C . J . Am. Chem. SOC.1992, 114, 459. (6) Jarrold, M.F.; Honea, E. C. J . Phys. Chem. 1991, 95, 9181. (7) Bradley, C. D. Ph.D. Thesis, University of Warwick, 1992. (8) Winger, B. E.; Laue, H.J.; Homing, S.R.; Julian, R.K.;Lammert, S.A.; Riederer, D. E.; Cooks, R. G. Rev. Sci. Instrum. 1992, 63, 5613. ( 9 ) Derrick, P. J.; Colburn, A. W.; Sheil, M.M.;Uggerud, E. J . Chem. Sac., Faraday Trans. 1990,86, 1533.

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Douglas G. Frank, Oliver M. R. Chyan, Teresa Golden, and Arthur T. Hubbard': Probing Three Distinct Iodine Monolayer Structures at R(111) by Means of Angular Distribution Auger Microscopy: ResultsAgree with Scanning Tunneling Microscopy Pages 3830and 3835. Figures 1 and 8 on these two pages were inadvertently switched during the printing process. However, the captions are correct as printed.