nonrigid moleculesH 2O 2Based on the concept of isometric groups it has been shown that the symmetry number of the rotation—finite internal motion problem of nonrigid molecules is given by the order of the group . This allows calculation of the semiclassical approximation to the sum of states...
The symmetry number σ for a nonlinear molecule, which is again the number of indistinguishable rotations, can take on a range of values, depending upon the geometrical arrangement of the atoms in the molecule. It is easy to show that σ has the following values for some common molecules. ...
[Symmetry of single-stranded DNA molecules] 来自 Semantic Scholar 喜欢 0 阅读量: 12 作者: A Iu Leont'ev 摘要: A system of so-called coloured symmetry transformations is introduced, in the basis of which all possible symmetry groups of a single strand DNA molecule taken as a genetic ...
Presents the third of a series of articles on symmetry. Describes the symmetry properties of molecules in translatiional and rotational motion. Presents th... Orchin, Milton|Jaffe, H. H - 《Journal of Chemical Education》 被引量: 12发表: 1970年 Three-dimensional finite point groups and the...
Crystals and molecules may indeed be described in terms of the number and type of symmetry operations that can be performed on them. The quantitative discussion of symmetry is called group theory. Valid symmetry operations are those that can be performed without changing the appearance of an ...
ChemInform Abstract: NUMBER AND SYMMETRY OF KEKULE STRUCTURES FOR SOME AROMATIC CHAIN MOLECULESstructure (organic substancesdoi:10.1002/chin.198334078S. J. CYVINWILEY‐VCH Verlag GmbHCheminform
1. The octet rule is found to be equivalent to the condition that the number of unshared electrons in a valence-bond structure be as small as possible, or, when this number is zero, to the conditi... HA Bent - 《Chemical Reviews》 被引量: 550发表: 1961年 Ruthenium Nanoparticles ...
It is emphasized that the symmetry behavior of degenerate vibrational states of this class of molecules depends on the joint action of end-to-end and torsional Coriolis coupling by a complex mechanism, with group theoretical implications. A new vibration–torsion quantum number is defined, to ...
The symmetry of molecules may affect the formation of van der Waals forces or hydrogen bonds between them, which can be used to study the mechanics of intermolecular interactions. In physics [4], many motions have symmetry, such as the swing of a pendulum. In electrical circuits [5], ...
The relevance of Chern numbers to the notion of reorganization of energy bands in molecules was initially suggested in [9], where the reorganization of energy bands was related to the modifications of the Chern number associated with the corresponding singularity. This initial paper was inspired by...