Transition-metal ions in aluminophosphate and silicoaluminophosphate molecular sieves: location, interaction with adsorbates and catalytic properties

Article Abstract:

There are three different methods by which transition metal ions can be introduced into silicoaluminophosphates. These are through addition to the synthesis gel, impregnation and solid state or liquid state ion-exchange. The use of complementary techniques such as Moss-bauer spectroscopy, infrared spectroscopy and electron spin resonance have shown that various metal ions can be incorporated into the tetrahedral framework of silicoaluminosphosphates-n or aluminophosphate-n materials.

Research, Aluminum silicates, Molecular sieves, Metal ions

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Quantum dynamical approach to ultrafast molecular desorption from surface

Article Abstract:

Advances in the quantum theory and the dynamics of processes at surfaces that are driven by photons and leads to bond breaking are described. The first step toward dynamics is the determination of ground- and excited-state potentials of the adsorbate-surface system, and the desorption serves as a model reaction for many other dynamical processes at adsorbate-covered surfaces, the example being the time limit of ultrafast processes being pushed into attosecond domain.

Observations, Quantum theory, Quantum mechanics, Photons, Scanning tunneling microscopy, Mechanical properties

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Photoreaction dynamics of molecular adsorbates on semiconductor and oxide surfaces

Article Abstract:

The stimulation of surface reaction by light focusing on reaction dynamics with a finite band gap, such as, a semiconductor or metal oxide, which inhibits or modifies the flow of any phtogenerated carrier across the adsorbate/crystal interface, is described. This approach to understanding surface photodynamics allows seeing that a surface alters the isolated molecule chemical response in several major and distinct ways.

Optical properties, Dissociation, Dissociation reactions, Gallium arsenide, Metal oxide semiconductors, Chemical properties

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