STM-induced desorption of hydrogen from a silicon surface: an open-system density matrix study

Article Abstract:

The desorption of hydrogen atoms from Si-(100)-(2 X 1):H (D) surfaces by scanning tunneling microscopy in the 'above electronic threshold limit' has been studied. The importance of coordinate-dependent resonance decay and finte surface temperature have also been investigated. Time-dependent wave packet and density matrix methods have been used and results have been compared with classical mechanics. The results are similar to data obtained by Avouris in their semiclassical investigation. Desorption is independent of surface temperature up to room temperature.

Hydrogen, Silicon

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Is infrared laser-induced desorption a thermal stress? The case of aniline

Article Abstract:

The laser-induced thermal desorption of (LITD) aniline submonolayers from silica and from glassy graphite has been studied. The experiments were carried out in an ultrahigh vacuum chamber with surfaces made either of glassy graphite or thick disk of fused silica. Results indicated that the LITD of aniline up heating rates of 10 raised to the 10th power K/s is consistent with the complete thermalization of the molecules during fast desorption.

Monomolecular films, Aniline

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Effects of molecular geometry on the STM image contrast of methyl- and bromo-substituted alkanes and alkanols on graphite

Article Abstract:

Issues concerning the interaction between topographic and electronic factors in a scanning tunneling microscopy (STM) image are discussed. STM is a useful technique for assessing the different packing arrangements of adsorbates on a surface in equilibrium with the adsorbed molecules dissolved in solution phase.

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