相关实验视频
Updated: Jul 19, 2025

10:59
Analysis of SEC-SAXS data via EFA deconvolution and Scatter
Published on: January 28, 2021
9.1K
量化物理洞察力与对X射线光电子光谱的贝叶斯谱学的详尽搜索合作
Hiroyuki Kumazoe1, Kazunori Iwamitsu2, Masaki Imamura3
1Graduate School of Social Data Science, Hitotsubashi University, Kunitachi, Tokyo, 186-8601, Japan. h.kumazoe@r.hit-u.ac.jp.
Scientific reports
|August 14, 2023
概括
我们开发了一种新的贝叶斯谱法,用于精确的X射线光电子光谱 (XPS) 分解石墨烯. 这种技术准确地分析了SiC上的石墨烯中的碳1s状态,即使有重叠的光谱成分.
科学领域:
- 材料科学 材料科学 材料科学
- 表面科学是一门学科.
- 频谱学是一种光谱学.
背景情况:
- 在SiC基板上生长的石墨烯由于各种碳1s状态而表现出复杂的X射线光电子光谱 (XPS).
- 准确的光谱分解对于理解石墨烯的电子特性和接口特征至关重要.
- 现有的方法经常因重叠的光谱特征和缺乏先前的结构信息而扎.
研究的目的:
- 开发一个强大的框架,用于高精度的XPS光谱分解石墨烯和氧气间接石墨烯在SiC(0001) 上.
- 为了能够精确地分析碳1s状态,即使没有先前的物理知识或可靠的结构模型.
- 为了达到meV级精度,对不同石墨烯层的结合能量的确定.
主要方法:
- 贝叶斯光谱学的应用,用于分析X射线光电子光谱 (XPS).
- 开发一个新的框架,从数据中发现物理约束,以指导光谱分解.
- 使用复制品交换蒙特卡罗代与物理知情的先前概率.
- 一个单层 (1ML),两个单层 (2ML) 和准独立的2ML (qfs-2ML) 石墨烯样本的分析.
主要成果:
- 在SiC上成功分解XPS光谱,用于各种石墨烯厚度的石墨烯,精度为meV.
- 可以区分的缓冲层组件的结合能的后面概率分布,尽管有重叠的光谱特征.
- 在蒙特卡洛代过程中抑制峰值组件交换,从而获得更稳定的结果.
- 在没有预定义的结构模型或已知的组件数量的情况下,证明了分解光谱的能力.
结论:
- 拟议的贝叶斯光谱学框架使复杂的石墨烯系统的高精度XPS分解成为可能.
- 该方法通过结合数据驱动的物理约束来克服传统方法的局限性.
- 这一进步使得石墨烯接口和电子结构的详细表征具有前所未有的精度.
相关概念视频
UV–Vis Spectroscopy: Molecular Electronic Transitions
1.6K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
1.6K
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview
2.8K
Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material, molecules absorb light depending on the energy required for...
2.8K
Atomic Absorption Spectroscopy: Overview
2.2K
Atomic absorption spectroscopy (AAS) is a technique used to analyze elements by measuring electromagnetic radiation (EMR) absorbed by atoms, which causes them to transition to a higher-energy orbit. The most crucial step in AAS is atomization, where the analyte is converted into gas-phase atoms, typically through a flame or furnace. Some of these atoms become thermally excited in the flame, while most remain in the ground state.
When irradiated by EMR of a particular wavelength, these...
When irradiated by EMR of a particular wavelength, these...
2.2K
Atomic Emission Spectroscopy: Instrumentation
524
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
524
UV–Vis Spectroscopy of Conjugated Systems
7.1K
Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent...
One of the factors influencing λmax is the extent...
7.1K
Atomic Absorption Spectroscopy: Instrumentation
787
An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
The atomizer used in AAS can be either a flame atomizer or an...
787

