Electron Collisions with Molecules, Clusters, and Surfaces by T. N. Rescigno (auth.), H. Ehrhardt, L. A. Morgan (eds.) PDF

By T. N. Rescigno (auth.), H. Ehrhardt, L. A. Morgan (eds.)

ISBN-10: 1489914897

ISBN-13: 9781489914897

ISBN-10: 1489914919

ISBN-13: 9781489914910

This quantity comprises the invited papers and chosen contributed papers awarded on the biennial overseas Symposium on ELECTRON COLLISIONS WITH MOLECULES, CLUSTERS AND SURF ACES held at Royal Holloway, college of London from twenty ninth to thirtieth July, 1993. This Symposium used to be a satellite tv for pc assembly of the XVIII foreign convention at the Physics of digital and Atomic Collisions (ICPEAC) and follows a sixteen yr culture of satellite tv for pc meetings in comparable components of collisions held in organization with prior ICPEAC's. long ago every one of those electron -molecule symposia coated the extensive box of electron-molecule scattering at relatively low energies, but in addition incorporated scorching issues. This time in addition to overlaying the total box, good outlined electron collisions with clusters and with debris within the complicated power of a floor have been emphasised. now not many info are identified approximately such collisions, even supposing they develop into a growing number of vital in floor characterisation, plasma-wall interactions, electron triggered desorption and reorganisation of adsorbed debris. lately, a lot paintings, theoretical and experimental, has been dedicated to electron collisions with relatively huge carbon, silicon and halogen containing molecules. those difficulties are of relevance in plasma assisted skinny movie formation and etching of surfaces and will now be approached with complicated theoretical equipment and experimental equipment.

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I993). (1993);. 2 e V. 36 As a test we have measured the excitation function of Helium into the 2 3S and 2 1S state. 4. 5. This spectrum contains different vibrational peaks of all the electronic states lying in this range. e. non resonant transition from the ground state to the a 3n state. ,1985). On the other hand this feature is also consistent with the existence of a resonance involving a potential energy curve which almost coincides with the a 3n curve. The existence of such a state has been hinted at by Huber and Herzberg(1979) on the basis of the observations on ground state vibrational excitations made by Wong and Schulz(1974).

I • . ,. ,.. ,.... -.. ~ ............. ~AJ. ~):-. 10. a) Energy dependence of the absolute differential cross section for vibrational excitation v=O~l of the X'l;+ state of CO at different scattering angles. b) Angular distribution for the same transition. 01 eV. Ehrhardt et al. S eV, - - calculation of Read (1968). This is only natural as a shape resonance normally decays into its parent state. It should now be possible to conclude which of the following three collision processes X 11:+(v=0) + e- => a3n(v') + e- direct excitation (i) X 11:+(v=0) + e- => 2n => a 3n(v') + e- tail of low lying 2n resonance (ii) is the most likely and responsible for the steep rise of the cross section at threshold.

Their calculation was only at SCF level. 7 eV. Weatherford and Huo 23 also failed to find any Feshbach resonances below the b3~+ threshold. We can compare the R-matrix results with three experiments which have measured cross sections for the excitation of metastable states. Newman et al 1S have measured cross sections for the excitation of all metastables in the energy range 6 - 16 eV. 0 i : 6 8 10 12 14 16 18 Energy (eV) Figure 6. Cross sections for exciting all metastable states of CO; solid line, Morgan and Tennyson; dashed line, Newman et aI.

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Electron Collisions with Molecules, Clusters, and Surfaces by T. N. Rescigno (auth.), H. Ehrhardt, L. A. Morgan (eds.)

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