Desorption Induced by Electronic Transitions DIET V: by L. Sanche (auth.), Dr. Alan R. Burns, Dr. Ellen B. Stechel,

By L. Sanche (auth.), Dr. Alan R. Burns, Dr. Ellen B. Stechel, Dr. Dwight R. Jennison (eds.)

This quantity within the Springer sequence on floor Sciences offers a contemporary account of advances within the ever-broadening box of electron-and photon-stimulated sur­ face techniques. As in past volumes, those advances are provided because the court cases of the overseas Workshop on Desorption caused by way of digital Transitions; the 5th workshop (DIET V) was once held in Taos, New Mexico, April 1-4, 1992. it will likely be abundantly transparent to the reader that "DIET" isn't really limited to desorption, yet has for numerous years incorporated photochemistry, non-thermal floor amendment, exciton self-trapping, and lots of different phenomena which are brought about through electron or photon bombardment. despite the fact that, such a lot motivated floor tactics do percentage a standard physics: preliminary digital excitation, localization of the excitation, and conversion of digital power into nuclear kinetic strength. it's the wealthy version of this topic which makes the sphere so attention-grabbing and fruitful. we have now divided the booklet into 11 components as a way to emphasize the big variety of fabrics which are tested and to focus on contemporary experimental and theoretical advances. obviously, there's massive overlap among sections, and lots of papers will be acceptable in additional than one half. half I specializes in possibly the main lively zone within the box this present day: electron attachment. the following the detection and characterization of unfavourable ions shaped through attachment of elec­ trons provided externally from the vacuum are mentioned. moreover, the 1st observations of detrimental ions shaped via substrate photoelectrons are presented.

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The 0+ yield shows a threshold below which no ions are detected and above which the yield rises with electron energy; this is characteristic of dipolar dissociation. In the 0- spectra however, ions are detected below this threshold due to dissociative attachment. The intensity in this region is very strongly dependent on coverage as at high Oz coverages, resonances are clearly seen, which are absent at low coverages. We have measured the angular distribution of the 22 Figure 1 (c) Q ~ ~ ~ Z o ~ ..

Config. "t"g2 Vert. s. ReI. Lifetime Dissoc. limita Init. 0 No. larger 2nd In u 2~ g No larger 1st Out 2~ g aThe 1st limit is 0(3p) + O-(2p) and the 2nd is OeD) + 0-(2 p ). bUln" and "Out" refer to the initial movement of the 0- ion toward or away from the surface. Springer Series in Surface Sciences. Vol. R. B. Stechel . R. Jennison © Springer-Verlag Berlin Heidelberg 1993 33 other 02- states autoionize too fast [1]. The autoionization lifetime of the 2::E~ state is predicted to be longer than that of the 2nu state [1].

Sanche and L. Parenteau, Phys. Rev. Letters 59, 136 (1987); J. Chem. Phys. 93, 7476 (1990). 10. L. Sanche and M. Michaud, Phys. Rev. B30, 6078 (1984). 11. H. E. Ramaker, to be published in Surf. Sci. *Supported in Part by the Office of Naval Research. J. Dixon-Warren, E. T. C. Polanyi Department of Chemistry, University of Toronto, Toronto, Ontario, Canada M5S lAl The yield of desorbing Cl- ions produced by charge-transfer (CI') photo-dissociation of CCl4 adsorbed on a Ag(111) substrate, CCl4l'Ag + hv ~ CCI3/Ag(111) + Cl-, is reported as a function of coverage at 193 and 248nm and near the threshold for photoelectron emission at 280nm.

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