By G.A. Somorjai, M.A. van Hove

Show description

Read Online or Download Adsorbed Monolayers on Solid Surfaces PDF

Best nonfiction_1 books

Awakening: A Daily Guide to Conscious Living

Begin on a daily basis with a steady nudge towards better knowledge. this gorgeous new version of Awakening will consultant you into nearer alignment with the religious rules that govern all of existence. The 365 entries are equipped round the calendar 12 months and the seasons. each one short access stocks a little bit Shakti's transparent and straightforward knowledge and gives a meditation or query to consider.

Astrophysics and Space Science, Vol. 309

A couple of yr in the past we have been happy to announce theconference "The multi-messenger method of excessive energygamma-ray resources" which was once held in Barcelona, Spain,from Tuesday, July 4th to Friday, July seventh, 2006. This bookcollects its refereed court cases. The convention was once attendedby greater than 100 scientists from a dozen nations.

Additional info for Adsorbed Monolayers on Solid Surfaces

Sample text

Thus CO was discovered to have two different adsorption states, labelled a and/3, on a W substrate. For both CO and H2 on Pt(111) one state is found, while the same adsorbates on a stepped Pt(111) substrate exhibit two states: the new state is presumably to be attributed to adsorption at the steps. One often finds that with rising coverage first one state (site) is populated and then a second state (site) begins filling up. The positions and relative heights of the desorption peaks as a function of initial coverage can be analyzed with appropriate models: one obtains in this way good estimates for the binding energies (heats of adsorption).

VI). 3 SPI (Surface Penning Ionization) A metastable helium atom incident (with thermal kinetic energy) onto a surface allows a surface electron to tunnel to the unoccupied low helium level, enabling the excited helium electron to be emitted and detected 24). This occurs with energy and angular distributions characteristic of the electronic structure and therefore geometry of the surface, in a way similar to photoemission (see the heading: UPS and XPS). Whereas in photoemission the excitation occurs via a dipolar photon-electron interaction, in SPI it is an IF - r-~l-1 electron-electron interaction that takes place, so that the selection rules are different.

In LEIS 17a) high surface specificity is obtained because the very large cross sections for ion scattering ensures scattering off the outermost atomic layer only. Mutual shadowing of surface atoms is exploited to investigate their mutual positions. 5 A. This does allow gross (but important) observations such as whether adsorbed atoms lie tucked away between substrate atoms [for example, in the channels of fcc(110) surfaces] or instead are situated in more exposed positions [for example, on the ridges of fcc(1 I0) surfaces].

Download PDF sample

Rated 4.94 of 5 – based on 40 votes