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相关概念视频

Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

620
In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
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The Quantum-Mechanical Model of an Atom02:45

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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相关实验视频

Updated: Jun 13, 2025

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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隐式溶剂样本基础的量子诊断 隐式溶剂样本

Danil Kaliakin1, Akhil Shajan1,2, Fangchun Liang1

  • 1Center for Computational Life Sciences, Lerner Research Institute, The Cleveland Clinic, Cleveland, Ohio 44106, United States.

The journal of physical chemistry. B
|May 16, 2025
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概括
此摘要是机器生成的。

本研究将溶剂效应集成到量子模拟中,使用基于样本的量子对角化 (SQD) 方法与积分方程形式主义极化连续模型 (IEF-PCM). 这一进步使得溶液中的分子可以进行更准确的电子结构计算.

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科学领域:

  • 量子计算是一种量子计算.
  • 计算化学是一种计算化学.
  • 电子结构理论 电子结构理论

背景情况:

  • 基于样本的量子对角化 (SQD) 方法对分子基态能量的量子中心模拟具有前景.
  • 准确模拟电子结构需要包括溶解物-溶剂相互作用,这对于生物化学和医学应用至关重要.
  • 以前的SQD应用仅限于气相模拟,缺乏溶剂效应.

研究的目的:

  • 通过结合溶剂效应来弥合SQD应用中的差距.
  • 将积分方程形式主义极化连续模型 (IEF-PCM) 引入SQD计算中.
  • 为了证明SQD与IEF-PCM用于溶分子系统的可行性.

主要方法:

  • 在水溶液中对甲醇,甲基胺,乙醇和水进行了SQD/cc-pVDZ IEF-PCM模拟.
  • 使用了量子硬件 (ibm_cleveland,ibm_kyiv,ibm_marrakesh) 具有不同数量的量子比特 (27,30,41,52).
  • 与传统的CASCI/cc-pVDZ IEF-PCM模拟结果进行比较.

主要成果:

  • 成功地将IEF-PCM溶剂模型集成到SQD计算中.
  • 使用量子硬件获得水溶液中小分子的基本状态能量.
  • 证明了SQD IEF-PCM方法的可扩展性,随着量子位数的增加.

结论:

  • SQD IEF-PCM 方法是溶液中的分子量子模拟的可行方法.
  • 这项工作将SQD的适用性扩展到化学相关的冷凝相系统.
  • 证明的可扩展性表明,量子计算机上的更大,更复杂的分子模拟具有潜力.