Chain-length dependence of the dissociation dynamics of oriented molecular adsorbate: n-alkyl bromides on GaAs(110)

Article Abstract:

Adsorbates, or those oriented molecules in the condensed phase, have been found to dissociate when exposed under ultraviolet radiation. Experimental results derived from methyl bromide samples revealed that the alkyl chain length of adsorbates generate substantial changes in angular distributions. For the case of methyl bromide, the angular distribution is characterized by a focused beam of directly ejected hyperthermal methyl radicals which leads to a slower rate of desorption. Such a phenomenon is also exhibited by ethyl and propyl bromide.

Research, Bromides, Bromides (Chemistry)

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Quantum chemical study of adsorption and dissociation of [H.sub.2]S on the gallium-rich GaAs(001)-4 x 2 surface

Article Abstract:

An investigation is carried out about [H.sub.2]S adsorption and dissociation on the gallium-rich GaAs(001)-4 x 2 surface by using hybrid density functional theory. The calculation results show that transfer of one H atom from the chemisorbed [H.sub.2]S to a second-layer As atom, with an activation barrier of 8.2 kcal/mol, is more kinetically favorable than insertion of an H atom into the Ga dimer bond or transfer of one H atom to the other Ga dangling bonds.

Quantum chemistry, Gallium arsenide, Properties

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Tuning molecule-surface interactions with sub-nanometer-thick covalently bound organic monolayers

Article Abstract:

Tuning molecule-surface interactions with sub-nanometer-thick covalently bound organic monolayers were studied. The results revealed that slight changes in the chemical composition of small molecules comprising an adsorbed spacer layer in the range approximately 0.5 nm thick could have major effects on surface adsorption.

Monomolecular films, Chemical synthesis

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