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Related Concept Videos

Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

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: 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.
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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...
Emission Spectra02:39

Emission Spectra

When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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...
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.
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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Two-beam-excited conical emission.

M Kauranen, J J Maki, A L Gaeta

    Optics Letters
    |September 25, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Researchers observed conical light emission from intersecting laser beams in sodium vapor. This phenomenon arises from a phase-matched four-wave mixing process, creating light on a cone

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    Preparing a Celadonite Electron Source and Estimating Its Brightness
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    Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
    12:57

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    Published on: October 13, 2017

    Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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    Preparing a Celadonite Electron Source and Estimating Its Brightness
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    Preparing a Celadonite Electron Source and Estimating Its Brightness

    Published on: November 5, 2019

    Area of Science:

    • Atomic, Molecular, and Optical Physics
    • Nonlinear Optics

    Background:

    • Interactions between light and matter are fundamental to many physical processes.
    • Nonlinear optical phenomena, such as four-wave mixing, enable novel light generation and manipulation.
    • Understanding light-matter interactions in atomic vapors is crucial for applications in spectroscopy and quantum optics.

    Purpose of the Study:

    • To investigate and characterize a novel conical light emission process.
    • To elucidate the underlying physical mechanism responsible for the observed emission.
    • To explore the role of near-resonant light-atom interactions in nonlinear optical phenomena.

    Main Methods:

    • Experimental setup involving two intersecting beams of near-resonant light.
    • Observation of light emission patterns in sodium vapor.
    • Theoretical analysis attributing the effect to a specific nonlinear optical process.

    Main Results:

    • A distinct conical emission pattern of light was observed.
    • The emitted light forms a circular cone centered on the bisector of the applied beams.
    • The cone's angular extent precisely matches the crossing angle of the incident beams.

    Conclusions:

    • The observed conical emission is a direct consequence of a perfectly phase-matched four-wave mixing process.
    • This nonlinear optical process efficiently converts the incident light into a new emission pattern.
    • The findings contribute to the understanding of light propagation and nonlinear interactions in atomic media.