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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...
Design Example: Automobile Ignition System01:14

Design Example: Automobile Ignition System

The automobile's ignition system plays a vital role by ensuring the timely ignition of the fuel-air mixture in each cylinder. This ignition is facilitated by a spark plug, which is composed of two electrodes separated by an air gap. A spark forms across this air gap when a substantial voltage is generated between the electrodes, leading to the ignition of the fuel.
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Van de Graaff Generator01:15

Van de Graaff Generator

Van de Graaff generators (or Van de Graaffs) are devices used to demonstrate high voltage due to static electricity that can also be used for research. Robert Van de Graaff first built one in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research.
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Processes at Electrodes01:30

Processes at Electrodes

The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle01:19

Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle

Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
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...

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Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization
06:58

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Published on: July 12, 2016

Explosive anode erosion in high current sparks.

K Schönbach, H Fischer

    Applied Optics
    |January 16, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Optical phenomena in nanosecond spark discharges were identified as explosive erosion jets. This study explains the explosive erosion mechanism and observes thermalization with longer pulse durations.

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    Area of Science:

    • Plasma Physics
    • Materials Science
    • Optical Physics

    Background:

    • High-density nanosecond spark discharges exhibit complex optical phenomena at the anode.
    • Understanding these phenomena is crucial for applications involving electrical discharges and material processing.

    Purpose of the Study:

    • To investigate the nature of tree-shaped optical phenomena observed in nanosecond spark discharges.
    • To elucidate the underlying mechanism of explosive erosion of electrode material.
    • To analyze the effect of pulse duration on thermalization processes.

    Main Methods:

    • Time-resolved photography was employed to capture the dynamics of the optical phenomena.
    • Spectroscopy was utilized to identify the composition of the erupting material.
    • Experimental parameters, including pulse duration, were varied to study their influence.

    Main Results:

    • The tree-shaped optical phenomena were identified as explosive erosion jets composed of electrode material.
    • A detailed mechanism for the explosive erosion process was successfully explained.
    • Evidence of thermalization was observed, particularly with increased pulse durations.

    Conclusions:

    • Explosive erosion jets are the primary cause of the observed anode optical phenomena in these discharges.
    • The findings provide insights into material transfer and energy deposition in high-current pulsed discharges.
    • Further research into pulse duration effects can optimize discharge parameters for specific applications.