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Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle

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: 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.

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.

Atomic Emission Spectroscopy: Interference

Atomic Emission Spectroscopy: Interference

In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...

Inductively Coupled Plasma–Mass Spectrometry (ICP–MS): Overview

Inductively Coupled Plasma–Mass Spectrometry (ICP–MS): Overview

In inductively coupled plasma–mass spectrometry (ICP–MS), an inductively coupled plasma (ICP) torch is used as an atomizer and ionizer. Solid samples are dissolved and volatilized before being introduced into the high-temperature argon plasma, while solution samples are nebulized and passed through the high-temperature argon plasma. Plasma dissociates the analytes and ionizes their component atoms to form a mixture of positive ions and molecular species. The positive ions are then passed on to...

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Related Experiment Video

Updated: Jun 25, 2026

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

Published on: August 1, 2017

Improved plasma uniformity in a discharge system with electron injection.

A V Vizir¹, A V Tyunkov, M V Shandrikov

¹Institute of High Current Electronics, Siberian Division, Russian Academy Science, Tomsk 634055, Russia. vizir@opee.hcei.tsc.ru

The Review of Scientific Instruments

|March 5, 2009

Summary

Improving plasma uniformity in constricted-arc discharge systems is crucial. Experiments show that using a distributing grid electrode and magnetic field compensation significantly enhances bulk plasma uniformity.

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Area of Science:

Plasma physics
Discharge systems

Background:

Constricted-arc discharge systems with electron injection are used in various applications.
Achieving uniform bulk plasma is essential for system performance.
Previous methods of geometric modification showed limited improvement.

Purpose of the Study:

To investigate methods for improving bulk plasma uniformity in a constricted-arc discharge system.
To evaluate the effectiveness of different electrode configurations and magnetic field applications.

Main Methods:

Experiments were conducted on a constricted-arc discharge system using argon at 0.5 mTorr.
Radial plasma distribution was measured using a movable Langmuir probe.
Investigated geometric modifications, a distributing grid electrode, and magnetic field applications (divergent and compensating fields).

Main Results:

Geometric modifications to the intermediate electrode and cathode had minimal impact on plasma uniformity.
A distributing grid electrode improved uniformity, especially at lower discharge voltages (< 20-30 V).
A divergent magnetic field reduced nonuniformity from 20% to 14%; magnetic self-field compensation further reduced it to 13%.

Conclusions:

A distributing grid electrode and magnetic field compensation are effective strategies for enhancing bulk plasma uniformity.
Optimizing discharge voltage and employing magnetic field control are key to achieving highly uniform plasma.
The findings offer a pathway to improved performance in constricted-arc discharge systems.