Topic
Valence (chemistry)
About: Valence (chemistry) is a research topic. Over the lifetime, 24937 publications have been published within this topic receiving 645252 citations. The topic is also known as: valency.
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TL;DR: A combination of new experimental and theoretical investigations has revealed interesting local aspects of chemical bonding in metals and thereby pointed to a route from the valence compounds, through the cluster and electron-deficient compounds, to the intermetallic phases as discussed by the authors.
Abstract: Intermetallic phases have long been among the black sheep in the family of chemical compounds. Their chemical bonding has eluded description by the valence rules, which otherwise are extremely effective. As a result, understanding of the structure–bonding relationships in these phases to date has remained nebulous, even though they form the largest group of inorganic compounds. Their broad industrial applicability and richly varied structural chemistry call for new approaches for explaining their structures, electronic structures, and physical properties. A combination of new experimental and theoretical investigations has revealed interesting local aspects of chemical bonding in metals and thereby pointed to a route from the valence compounds, through the cluster and electron-deficient compounds, to the intermetallic phases.
257 citations
TL;DR: In this paper, the O Is-O 2s energy separation (oxygen valence parameter) was introduced and compared with previous data from much smaller sample sets, showing that the separation of the two components from O-C=O groups is quite sensitive to structural variation.
Abstract: Over 70 oxygen-containing polymers have been studied using high-resolution monochromated XPS. O 1s binding energies (BEs) are reported and compared with previous data from much smaller sample sets. The separation of the two components from O-C=O groups is quite sensitive to structural variation. O 1s peak widths and the effect of shake-up on peak areas are also discussed. For about a representative one-third of these polymers the O 2s region of the valence band has been studied in detail. O 2s BEs are reported and a nen parameter is introduced: the O Is-O 2s energy separation (oxygen valence parameter). This parameter has a greater range than the O Is chemical shift, is independent of any surface charging, and appears to have interesting diagnostic potential
257 citations
TL;DR: The poster presented by as discussed by the authors at the 2019 Frontiers of Science Congress Series (MFS) celebrated in the Parque de las Ciencias de Granada (Espana) del 11 al 13 de septiembre de 2019.
Abstract: Resumen del poster presentado al Microscopy at the Frontiers of Science Congress Series (MFS), celebrado en el Parque de las Ciencias de Granada (Espana) del 11 al 13 de septiembre de 2019.
256 citations
TL;DR: In this paper, the room-temperature structural, optical and related properties, in the (low frequency) excitonic spectral region, of some single valence metal-halide compounds based on Pb, Sn and Ge are briefly reviewed and some new results are reported.
256 citations
TL;DR: In this paper, the ionic fraction in the reflected beam when an atom or ion is scattered from a metal surface at finite temperature is considered, and three regimes are distinguished: low temperature, high temperature and low temperature.
256 citations