Atom Definition Chemistry The smallest particle of an element, which may or may not have an independent existence but always takes place in a chemical reaction is called an atom. An atom is defined as the smallest unit that retains the properties of an element. An atom is composed of sub-...
Other important (related) questions addressed by QTAIM include: What is an atom in a molecule or a crystal? How can an atom or a group of atoms be transferable sometimes in very di erent external potentials? Can one define bonding in molecules unambiguously especially in borderline cases? 展开...
摘要: Argues that teachers should teach modeling skills, encourage students to use multiple rather than isolated analogical models, and take the time to discuss and critique the models used in class. Analogical models and science knowledge; Student intellectual development; Mental model of an atom....
Clearly, one can think of conservation of bond order that includes ionic and covalent contributions to both D–X and XA bonds, for not only X = H/Cl/Li investigated here but also any atom involved in intermolecular bonding. 展开 DOI: 10.1039/c4cp02585g 被引量: 18 年份: 2014 ...
Bader提出的非常知名的atom-in-molecules (AIM)理论在分析孤立体系和周期性体系的电子结构方面有非常广泛的应用,相关资料汇总见《AIM学习资料和重要文献合集》(http://bbs.keinsci.com/thread-362-1-1.html)。AIM分析框架中最常见的分析手段之一是电子密度的拓扑分析,也常被称为AIM拓扑分析,例如根据这种拓扑分析得到...
Spectroscopy of atoms and molecules in gases: Corrections to the Doppler-recoil shift 来自 Semantic Scholar 喜欢 0 阅读量: 17 作者:MP Haugan,FV Kowalski 摘要: We analyze the excitation by an electromagnetic wave of a two-level molecule (or atom) within a rarefied gas. This process differs ...
Reports on Stanford University physicists' creation of a photon molecule using a mirror controlled by a single atom. Photon transmission by conventional photon beam splitters; Components of the Stanford team's device; P...
we observe that electron holes do not just migrate along the laser polarization direction, but may swirl around the atom centers. Our result establishes a general scheme for studying ultrafast electron dynamics in molecules, paving a way for further advance in tracing and controlling photochemical rea...
This is consistent with an interplay between the relative reactivity, surface passivation, and occurrence of the various faces on the monomer QDs. The (0002) facets, while in minority, manifest a Cd-rich termination with three dangling bonds per atom that can easily react with thiol linkers31....
It has been shownthat the metal atom is Si-bonded in a bent structure, withAg–Si–X bond angles close to 110°. The bondenergy has been found to be -7.8 and -11.1 kcalmol -1 for Ag···SiO andAg···SiS, respectively. Theexperimental frequency shift of the SiX stretching mode...