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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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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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Overview of Electron Microscopy01:25

Overview of Electron Microscopy

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The wavelengths of visible light ultimately limit the maximum theoretical resolution of images created by light microscopes. Most light microscopes can only magnify 1000X, and a few can magnify up to 1500X. Electrons, like electromagnetic radiation, can behave like waves, but with wavelengths of 0.005 nm, they produce significantly greater resolution up to 0.05 nm as compared to 500 nm for visible light. An electron microscope (EM) can create a sharp image that is magnified up to 2,000,000X.
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Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

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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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IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
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Scanning Electron Microscopy01:07

Scanning Electron Microscopy

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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
Fundamental Principles
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IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
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Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F&#8722;
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Vibrational spectroscopy in the electron microscope.

Ondrej L Krivanek1, Tracy C Lovejoy2, Niklas Dellby2

  • 11] Nion Company, 1102 Eighth Street, Kirkland, Washington 98033, USA [2] Department of Physics, Arizona State University, Tempe, Arizona 85287, USA.

Nature
|October 10, 2014
PubMed
Summary
This summary is machine-generated.

High-resolution vibrational spectroscopy is now possible in electron microscopes. This breakthrough enables detailed analysis of nanomaterials and their vibrational modes, even detecting hydrogen, with minimal radiation damage.

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Area of Science:

  • Materials Science
  • Spectroscopy
  • Nanotechnology

Background:

  • Vibrational spectroscopies are crucial for material analysis but typically lack high spatial resolution.
  • Existing methods like infrared and Raman spectroscopy offer limited spatial resolution (micrometers to nanometers).
  • Transmission electron microscopy (TEM) provides high spatial resolution but lacked the energy resolution for vibrational spectroscopy.

Purpose of the Study:

  • To enable vibrational spectroscopy within a transmission electron microscope (TEM).
  • To achieve nanometer-level spatial resolution for vibrational analysis of materials.
  • To explore new applications of vibrational spectroscopy in nanostructures.

Main Methods:

  • Utilizing recent advancements in electron energy loss spectroscopy (EELS) within a scanning transmission electron microscope (STEM).
  • Achieving an energy resolution of approximately ten millielectronvolts (meV).
  • Developing techniques for both high- and low-spatial-resolution vibrational signal analysis.

Main Results:

  • Demonstrated successful vibrational spectroscopy with nanometer-level resolution in a TEM.
  • Applied the technique to analyze inorganic and organic materials, including hydrogen detection.
  • Showcased 'aloof' spectroscopy for analysis with reduced radiation damage.

Conclusions:

  • Improved EELS resolution in STEM now allows for vibrational spectroscopy in electron microscopes.
  • This technique opens new avenues for studying vibrational modes in diverse nanostructures.
  • The dual-component signal allows for high-resolution mapping and damage-minimized aloof spectroscopy.