INTERACTION OF BROMOCYCLOPROPANE WITH CU(110)

The adsorption of bromocyclopropane on a Cu(110) single crystal surfac e was investigated using HREELS and TPD measurements over the temperat ure range 90-500 K. Molecular desorption of multilayer and monolayer b romocyclopropane was detected at 160 and 208 K, respectively. Changes in the relative intensities of the HREELS peaks provide some evidence that a small fraction of the monolayer dissociates on the Cu(110) surf ace at or below 210 K. A comparison of spectra obtained at 250 K with previous results for electron irradiated cyclopropane suggests the for mation of a small coverage of cyclopropyl groups. A weak TPD peak at 3 63 It is tentatively attributed to propene formation via cyclopropyl d ecomposition. DFT-LSD calculated data are used in the assignment of th e HREELS loss peaks. (C) 1998 Elsevier Science B.V. All rights reserve d.