Publication

Cage effect for the abstraction of atomic hydrogen from water in argon matrixes

Majed Chergui
1989
Journal Articles

Abstract

A red wing in the absorption of H2O in the 1st continuum which extends beyond 200 nm was induced by the matrix. A threshold energy of 6.95 eV was found for the quantum efficiency of permanent dissocn. of H2O into OH and H. This corresponds to an addnl. barrier of 1.8 eV due to the matrix cage. The barrier was attributed to the sum of repulsive H-Ar pair potentials in an interstitial site of D3 symmetry, which must be surmounted by the H atom on the way from the initial substitutional H2O site to the final stable Oh site of the abstracted H atom. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/1da5fbc2-2ace-42b3-a751-15512131c28b

About this result

This page is automatically generated and may contain information that is not correct, complete, up-to-date, or relevant to your search query. The same applies to every other page on this website. Please make sure to verify the information with EPFL's official sources.

Graph Chat

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

Majed Chergui
1989
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/1da5fbc2-2ace-42b3-a751-15512131c28b

About this result

Related concepts (28)

Symmetry group

In group theory, the symmetry group of a geometric object is the group of all transformations under which the object is invariant, endowed with the group operation of composition. Such a transformation is an invertible mapping of the ambient space which takes the object to itself, and which preserves all the relevant structure of the object. A frequent notation for the symmetry group of an object X is G = Sym(X). For an object in a metric space, its symmetries form a subgroup of the isometry group of the ambient space.

Rotational symmetry

Rotational symmetry, also known as radial symmetry in geometry, is the property a shape has when it looks the same after some rotation by a partial turn. An object's degree of rotational symmetry is the number of distinct orientations in which it looks exactly the same for each rotation. Certain geometric objects are partially symmetrical when rotated at certain angles such as squares rotated 90°, however the only geometric objects that are fully rotationally symmetric at any angle are spheres, circles and other spheroids.

Icosahedral symmetry

In mathematics, and especially in geometry, an object has icosahedral symmetry if it has the same symmetries as a regular icosahedron. Examples of other polyhedra with icosahedral symmetry include the regular dodecahedron (the dual of the icosahedron) and the rhombic triacontahedron. Every polyhedron with icosahedral symmetry has 60 rotational (or orientation-preserving) symmetries and 60 orientation-reversing symmetries (that combine a rotation and a reflection), for a total symmetry order of 120.