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Overview of Electron Microscopy

Overview of Electron Microscopy

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.

Scanning Electron Microscopy

Scanning Electron Microscopy

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.
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Preparation of Samples for Electron Microscopy

Preparation of Samples for Electron Microscopy

To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...

Atomic Emission Spectroscopy: Overview

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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...

Atomic Emission Spectroscopy: Instrumentation

Atomic Emission Spectroscopy: Instrumentation

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.

Atomic Emission Spectroscopy: Lab

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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...

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Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

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Microcalorimeter energy-dispersive spectrometry using a low voltage scanning electron microscope

Wollman¹, Nam, Hilton

¹National Institute of Standards and Technology (NIST), Boulder, CO 80303, USA NIST, Gaithersburg, MD 20899-8371, USA.

Journal of Microscopy

|July 8, 2000

Summary

The new microcalorimeter energy-dispersive spectrometer (µcal EDS) excels at low-beam-energy X-ray microanalysis. This advanced instrument provides significant advantages for analyzing materials like WSi2, TiN, and BaTiO3.

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Area of Science:

Materials Science
Analytical Chemistry
Physics

Background:

X-ray microanalysis is crucial for material characterization.
Low-beam-energy analysis presents unique challenges.
Existing energy-dispersive spectrometers have limitations in this range.

Purpose of the Study:

To evaluate the performance of a prototype microcalorimeter energy-dispersive spectrometer (µcal EDS) developed at NIST.
To demonstrate the advantages of µcal EDS for low-beam-energy microanalysis.
To showcase its application in solving real-world microanalysis problems.

Main Methods:

Development and testing of a prototype µcal EDS system.
Operation in the low-energy range of 0.2-2 keV.
Application to the analysis of specific materials and chemical states.

Main Results:

The prototype µcal EDS demonstrates significant advantages for low-beam-energy microanalysis.
Successful analysis of tungsten silicide (WSi2), titanium nitride (TiN), and barium titanate (BaTiO3) was achieved.
Accurate measurement of chemical shifts in Fe and C compounds was performed.

Conclusions:

The µcal EDS is a promising technology for advanced X-ray microanalysis.
It offers superior performance for low-voltage and low-energy applications.
This technology can effectively address challenges in microanalysis of various materials.