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Related Concept Videos

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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.

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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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Photoacoustic spectroscopy with quantum cascade distributed-feedback lasers.

D Hofstetter, M Beck, J Faist

    Optics Letters
    |November 28, 2007
    PubMed
    Summary

    Photoacoustic spectroscopy detected carbon dioxide, methanol, and ammonia. This sensitive method achieved a 300 parts per billion ammonia detection limit using a quantum cascade laser.

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    Area of Science:

    • Analytical Chemistry
    • Spectroscopy
    • Laser Technology

    Background:

    • Photoacoustic (PA) spectroscopy is a sensitive technique for gas detection.
    • Quantum cascade lasers (QCLs) offer tunable, narrow-linewidth light sources suitable for spectroscopy.

    Purpose of the Study:

    • To demonstrate the application of a QCL-based PA system for detecting carbon dioxide, methanol, and ammonia.
    • To evaluate the sensitivity and performance of the developed PA setup.

    Main Methods:

    • Utilized a single-mode quantum cascade distributed-feedback laser operated in pulsed mode.
    • Employed a Herriott multipass arrangement for the PA cell, coupled with a 16-microphone array.
    • Achieved temperature tuning for wavelength control, yielding a 3 cm(-1) range with a 0.2 cm(-1) linewidth.

    Main Results:

    • Successfully performed PA spectroscopy measurements on carbon dioxide, methanol, and ammonia.
    • Achieved a sensitive detection limit of 300 parts per billion (ppb) for ammonia.
    • Demonstrated the effectiveness of the multipass arrangement and microphone array in enhancing sensitivity.

    Conclusions:

    • The developed QCL-based PA system is highly effective for sensitive gas detection.
    • The system shows promise for trace gas analysis, particularly for ammonia.
    • Further optimization could lead to even lower detection limits for various gases.