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Related Concept Videos

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 Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...
Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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.
The atomizer used in AAS can be either a flame atomizer or an...
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...
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...
Atomic Emission Spectroscopy: Interference01:30

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,...

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Related Experiment Video

Updated: May 11, 2026

Implementation of a Reference Interferometer for Nanodetection
16:11

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

New method for gravitational wave detection with atomic sensors.

Peter W Graham1, Jason M Hogan, Mark A Kasevich

  • 1Department of Physics, Stanford Institute for Theoretical Physics, Stanford University, Stanford, California 94305, USA.

Physical Review Letters
|May 18, 2013
PubMed
Summary

New atomic clock sensors offer sensitive gravitational wave detection, immune to laser noise. This breakthrough allows single-baseline measurements, advancing astrophysics and geodesy.

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Last Updated: May 11, 2026

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Area of Science:

  • Physics
  • Astrophysics
  • Geodesy

Background:

  • Laser frequency noise is a primary limitation in detecting gravitational waves with long-baseline optical interferometry.
  • Current methods require multiple interferometer baselines, increasing system complexity for space-based or ground-based detectors.

Purpose of the Study:

  • To introduce a novel gravitational wave detection strategy.
  • To overcome the limitations imposed by laser frequency noise in interferometric detectors.
  • To enable sensitive gravitational wave detection using a single baseline.

Main Methods:

  • Utilizing recent advancements in optical atomic clocks and atom interferometry.
  • Developing a sensor where the signal relies on light propagation time between atomic ensembles.
  • Implementing a system that is inherently immune to laser frequency noise.

Main Results:

  • Demonstrated a new detection strategy that effectively suppresses laser frequency noise.
  • Enabled sensitive gravitational wave detection with a single interferometer baseline.
  • Showcased the potential for ultrasensitive gravimeters and gravity gradiometers.

Conclusions:

  • The proposed atomic sensor technology offers a significant advancement for gravitational wave detection.
  • This approach simplifies detector configurations by eliminating the need for multiple baselines.
  • The technology has broad applications in precision measurement for both astrophysics and geodesy.