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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

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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...
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Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Molecular Spectroscopy: Absorption and Emission01:14

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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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Four-dimensional electron energy-loss spectroscopy.

Mei Wu1, Ruochen Shi1, Ruishi Qi2

  • 1International Center for Quantum Materials, Peking University, Beijing 100871, China; Electron Microscopy Laboratory, School of Physics, Peking University, Beijing 100871, China.

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|August 6, 2023
PubMed
Summary
This summary is machine-generated.

Four-dimensional electron energy-loss spectroscopy (4D-EELS) uses advanced scanning transmission electron microscopy to achieve nanoscale resolution. This technique enables detailed mapping of local dispersion and physical properties, advancing materials science research.

Keywords:
Defect scatteringFour-dimensional electron energy-loss spectroscopy (4D-EELS)Phonon dispersionScanning transmission electron microscopy (STEM)

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Area of Science:

  • Materials Science
  • Spectroscopy
  • Electron Microscopy

Background:

  • Recent advancements in scanning transmission electron microscopy (STEM) have led to atomic-scale electron probes with high coherence and monochromaticity.
  • These probes enable nanoscale spatial resolution, meV energy resolution, and sufficient momentum resolution in electron energy-loss spectroscopy (EELS).
  • Four-dimensional EELS (4D-EELS) leverages these capabilities by recording datasets with specific momentum selection and spatial scanning.

Purpose of the Study:

  • To present the fundamental principles of the 4D-EELS technique.
  • To showcase diverse applications of 4D-EELS in materials characterization.
  • To highlight the potential of 4D-EELS for nanoscale probing of physical properties.

Main Methods:

  • Utilizing atomic-scale focused, coherent, and monochromatic electron probes in STEM.
  • Recording 4D-EELS datasets by selecting specific momentum directions and scanning the beam in two spatial dimensions.
  • Employing mathematical combinations of spectral data at different momenta for advanced analysis.

Main Results:

  • Acquisition of parallel dispersion data down to the lattice vibration scale.
  • Mapping of real-space variations in EELS spectral features for specific momentum transfers and energy losses.
  • Demonstration of efficient and reliable electron magnetic circular dichroism (EMCD) signal acquisition from 4D datasets.

Conclusions:

  • The 4D-EELS technique offers unprecedented opportunities for nanoscale characterization.
  • It enables the study of locally inhomogeneous scattering processes and their impact on material properties.
  • This method provides new avenues for probing local dispersion and related physical phenomena at the nanoscale.