相关实验视频

Updated: Jul 14, 2025

A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer

A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer

Published on: April 12, 2017

对α-U和δ-Pu电子结构的新见解

A L Kutepov¹, J G Tobin², S-W Yu³

¹5 Carriage Ln, Roxbury, CT 06783, United States of America.

Journal of physics. Condensed matter : an Institute of Physics journal

|October 6, 2023

概括

这项研究使用一种新的GW方法揭示了α-和delta-plutonium的电子结构. 理论发现与实验数据很好地一致,增强了对活性化物电子性质的理解.

科学领域:

凝聚物质物理学凝聚物质物理学
量子化学是一个量子化学.
材料科学材料科学材料科学

背景情况:

像 (U) 和 (Pu) 这样的动因化金属表现出复杂的电子结构,这些结构对于它们的特性至关重要.
由于强烈的电子相关性和相对论效应,对这些活性化物进行准确的理论建模具有挑战性.

研究的目的:

从理论上研究阿尔法 (α-U) 和三角 (δ-Pu) 的电子结构.
将ab-initio计算与实验数据进行比较,包括光电子光谱学 (PES),射同色谱学 (BIS) 和逆光电子光谱学 (IPES).
为了区分U和Pu中的电子相关效应的强度,并澄清α-U的实验数据中的差异.

主要方法:

利用了自相一致的 Vertex 校正的 GW 方法,结合了基于狄拉克方程的相对论效应.
进行了对州的占用和不占用密度的ab-initio计算.
用局部密度近似 (LDA) 和自我一致的GW方法比较结果.

主要成果:

对α-U和δ-Pu的理论电子结构结果与实验测量结果有很好的一致性.
顶点校正的GW方法准确地描述了各州的占用和未占用密度.
该研究强调了和之间的相关性效应的差异,并完善了对α-U的实验BIS/IPES数据的理解.

结论:

顶部纠正的GW方法是研究动因体电子结构的可靠方法.
理论见解支持使用的近似值的有效性,并增强对实验数据的解释.
这项工作为进一步的理论研究关于活性化物物理学的研究提供了基础.

关键词:

GW的近似值为GW.在GW+DMFT.顶点纠正纠正顶点纠正

更多相关视频

Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films

Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films

Published on: November 9, 2015

U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen

U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen

Published on: February 21, 2019

相关概念视频

Nuclear Transmutation

Nuclear Transmutation

Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...

Radioactivity and Nuclear Equations

Radioactivity and Nuclear Equations

Nuclear chemistry is the study of reactions that involve changes in nuclear structure. The nucleus of an atom is composed of protons and, except for hydrogen, neutrons. The number of protons in the nucleus is called the atomic number (Z) of the element, and the sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are isotopes of the same element.
A nuclide of an element has a specific number of protons and...

Electron Configurations

Electron Configurations

Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
The relative energies of the subshells determine the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p,...

Nuclear Stability

Nuclear Stability

Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together...

Electronic Structure of Atoms

Electronic Structure of Atoms

An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum...

Subatomic Particles

Subatomic Particles

Dalton was only partially correct about the particles that make up matter. All matter is composed of atoms, and atoms are composed of three smaller subatomic particles: protons, neutrons, and electrons. These three particles account for the mass and the charge of an atom.