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Related Concept Videos

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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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).
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
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Atomic Fluorescence Spectroscopy01:29

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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...
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Updated: Dec 17, 2025

Three-dimensional Optical-resolution Photoacoustic Microscopy
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Dual-comb photoacoustic spectroscopy.

Jacob T Friedlein1, Esther Baumann1,2, Kimberly A Briggman1

  • 1National Institute of Standards and Technology, Applied Physics Division, 325 Broadway, Boulder, CO, 80305, USA.

Nature Communications
|June 21, 2020
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Summary
This summary is machine-generated.

Dual-comb spectroscopy enables simultaneous photoacoustic measurements at thousands of wavelengths, overcoming speed limitations of traditional methods for label-free imaging in scattering materials.

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Area of Science:

  • Optics
  • Spectroscopy
  • Biomedical Imaging

Background:

  • Spectrally resolved photoacoustic imaging offers label-free visualization in scattering media.
  • Current methods are slow, requiring separate measurements per wavelength, risking sample changes.
  • This limitation hinders real-time imaging applications.

Purpose of the Study:

  • To introduce a novel method for high-speed, spectrally resolved photoacoustic measurements.
  • To overcome the speed and accuracy limitations of conventional wavelength-by-wavelength acquisition.
  • To demonstrate a proof-of-concept for simultaneous multi-wavelength photoacoustic analysis.

Main Methods:

  • Utilized dual-comb spectroscopy for photoacoustic measurements.
  • Interfered two optical-frequency combs on polymer film samples.
  • Measured acoustic pressure waves with an ultrasound transducer and processed signals in the frequency domain.

Main Results:

  • Achieved simultaneous photoacoustic measurements across thousands of wavelengths.
  • Obtained optical absorption spectra that closely matched spectrophotometer results.
  • Demonstrated the feasibility of dual-comb spectroscopy for photoacoustic analysis.

Conclusions:

  • Dual-comb spectroscopy significantly enhances photoacoustic imaging speed by acquiring data across numerous wavelengths simultaneously.
  • This technique provides accurate spectral information, comparable to traditional methods.
  • Future improvements in signal-to-noise ratio could unlock high-speed, spectrally resolved photoacoustic imaging capabilities.