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Related Concept Videos

Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
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,...
Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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 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 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...

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Related Experiment Video

Updated: Jun 19, 2026

Implementation of a Reference Interferometer for Nanodetection
16:11

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Noise-immune conjugate large-area atom interferometers.

Sheng-Wey Chiow1, Sven Herrmann, Steven Chu

  • 1Physics Department, Stanford University, Stanford, California 94305, USA.

Physical Review Letters
|October 2, 2009
PubMed
Summary
This summary is machine-generated.

We developed simultaneous atom interferometers that significantly reduce vibrational noise. This advancement enhances precision measurements, including the fine structure constant, with potential for fundamental physics tests.

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Area of Science:

  • Atomic physics
  • Quantum optics
  • Metrology

Background:

  • Atom interferometers are crucial for precision measurements.
  • Previous designs were limited by vibrational noise.
  • Large momentum transfer beam splitters are key for enhanced sensitivity.

Purpose of the Study:

  • To present simultaneous conjugate Ramsey-Bordé atom interferometers.
  • To demonstrate improved common-mode noise rejection.
  • To achieve higher precision in fundamental constant measurements.

Main Methods:

  • Utilizing simultaneous conjugate Ramsey-Bordé configurations.
  • Employing large (20ħk)-momentum transfer beam splitters.
  • Implementing common-mode rejection of vibrational noise.

Main Results:

  • Achieved a 2500-fold increase in enclosed space-time area compared to previous 20ħk interferometers.
  • Demonstrated 3.4 ppb resolution in fine structure constant measurement using 10ħk splitting.
  • Established a new benchmark for atom interferometer performance.

Conclusions:

  • Simultaneous operation effectively suppresses common-mode noise.
  • The developed interferometers offer unprecedented precision for metrology.
  • This technology opens new avenues for testing fundamental physics.