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Videos de Conceptos Relacionados

Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

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...
Atomic Emission Spectroscopy: Instrumentation01:22

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.
Scanning Electron Microscopy01:07

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.
Fundamental Principles
Accelerated...
Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which are...
Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...

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Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
08:53

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

Published on: October 9, 2012

Espectroscopia de fotoelectrones de estado sólido con radiación de sincrotrón.

J H Weaver, G Margaritondo

    Science (New York, N.Y.)
    |October 12, 1979
    PubMed
    Resumen

    La radiación de sincrotrón mejora la espectroscopia de fotoelectrones, revolucionando el estudio del comportamiento electrónico en sólidos y superficies. Esta técnica permite el mapeo directo de la estructura de la banda electrónica y el análisis de la superficie.

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    Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation
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    Área de la Ciencia:

    • Física Física es la física de las cosas.
    • Química Química es la química.
    • Ciencia de los materiales Ciencia de los materiales.
    • Biología Biología Biología.

    Sus antecedentes:

    • La radiación del sincrotrón proporciona haces de fotones intensos, sintonizables, polarizados y estables.
    • Estos rayos tienen un impacto significativo en varios campos de investigación científica.
    • La espectroscopia de fotoelectrones de estado sólido es una técnica clave para estudiar las propiedades electrónicas.

    Objetivo del estudio:

    • Discutir las técnicas fundamentales de fotoemisión que utilizan la radiación sincrotrón.
    • Para resaltar los avances en la comprensión del comportamiento electrónico de los sólidos y las superficies.
    • Para mostrar las aplicaciones recientes en la ciencia de la superficie.

    Principales métodos:

    • Utilizando fuentes de radiación sincrotrón para la espectroscopia de fotoelectrones.
    • Empleando la sensibilidad de la superficie sintonizable en las técnicas de fotoemisión.
    • Mapeo directo de la estructura de la banda electrónica.

    Principales resultados:

    • La radiación de sincrotrón ha revolucionado la espectroscopia de fotoelectrones en estado sólido.
    • Las técnicas ofrecen sensibilidad de superficie ajustable.
    • Ahora es posible el mapeo directo de la estructura de la banda electrónica.

    Conclusiones:

    • La espectroscopia de fotoelectrones con radiación de sincrotrón es una herramienta poderosa.
    • Proporciona información directa sobre la estructura de las bandas electrónicas.
    • Las aplicaciones incluyen estudios detallados de la quimiosorción y las estructuras superficiales.