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相关概念视频

Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

4.0K
This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
4.0K
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.0K
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
2.0K
Comparison between RL and RC circuits01:24

Comparison between RL and RC circuits

3.8K
An RC circuit consists of resistance and capacitance, while in an RL circuit, capacitance is replaced by an inductor. RL and RC circuits are first-order differential circuits that store energy. An RC circuit stores energy in the electric field, while an RL circuit stores energy in the magnetic field. When connected to a battery, an RC circuit charges the capacitor, causing the current to decrease from maximum to zero upon being fully charged. This increases the voltage across the capacitor from...
3.8K
Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

2.1K
Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in...
2.1K
Applications of RC Circuits01:22

Applications of RC Circuits

3.0K
A relaxation oscillator is one of the applications of RC circuits. A neon lamp relaxation oscillator comprises a capacitor, a resistor, a voltage source, and a lamp. The lamp acts like an open circuit, with infinite resistance until the potential difference across the lamp reaches a specific voltage. At that voltage, the lamp acts like a short circuit with zero resistance, and the capacitor discharges through the lamp, thus producing light. Once the capacitor is fully discharged through the...
3.0K
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

185
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
185

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Updated: May 30, 2025

Automated Sample Multiplexing by using Combined Precursor Isotopic Labeling and Isobaric Tagging cPILOT
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相对论CASPT2/RASPT2程序与DIRAC软件一起使用

Yasuto Masuda1, Kohei Noda1, Sumika Iwamuro2

  • 1Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima City, Hiroshima 739-8526, Japan.

Journal of chemical theory and computation
|January 27, 2025
PubMed
概括
此摘要是机器生成的。

我们开发了针对动态电子状态的新计算程序,用相对论效应和电子相关性来增强理论计算. 这些工具,包括GUI,在GitHub上免费提供,用于推进核科学.

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RBDT: A Computerized Task System based in Transposition for the Continuous Analysis of Relational Behavior Dynamics in Humans
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15N CPMG Relaxation Dispersion for the Investigation of Protein Conformational Dynamics on the µs-ms Timescale
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RBDT: A Computerized Task System based in Transposition for the Continuous Analysis of Relational Behavior Dynamics in Humans
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科学领域:

  • 核科学是核科学的一个方面.
  • 理论化学是一种理论化学.
  • 计算物理学的计算物理.

背景情况:

  • 探索动因化合物中的电子状态至关重要,但由于相对论效应和电子相关性而具有挑战性.
  • 像CASSCF这样的传统方法对复杂的活性化物系统有局限性.

研究的目的:

  • 开发先进的计算工具,用于精确的理论计算的行为类电子状态.
  • 在这些计算中改进对相对论效应和电子相关性的处理.

主要方法:

  • 开发了CASPT2/RASPT2和DIRAC程序,用于使用相对论哈密尔顿的多配置扰动理论.
  • 使用了改进的虚拟轨道 (IVO) 方法和CASCI方法作为参考函数.
  • 为更大的活动空间实施了RASCI-RASPT2,并将整个程序并行.

主要成果:

  • 证明了CASCI-CASPT2在UO2^2+上使用1-256核的高效并行.
  • 使用RASCI-RASPT2计算UO2^2+的垂直激发能,与之前的研究一致.
  • 开发了一个GUI来帮助选择用于CASPT2/RASPT2计算的轨道空间.

结论:

  • 开发的程序提供了有效和易于使用的工具,用于Actinide电子结构计算.
  • 预计这些自由可用的资源的广泛使用将推动动因化化学的进一步进步.
  • 该研究强调了先进的计算方法对复杂的核科学问题的成功应用.