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Related Concept Videos

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
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Double Resonance Techniques: Overview01:12

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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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Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
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Mass Spectrometers

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This lesson details the instrumentation of a mass spectrometer—a physical instrument to perform mass spectrometry on analyte molecules and record the characteristic mass spectra. This is achieved via three chief functions:
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Gas Chromatography: Types of Detectors-II01:19

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In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
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Related Experiment Video

Updated: Apr 19, 2026

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
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GaAs coupled micro resonators with enhanced sensitive mass detection.

Tony Chopard1, Vivien Lacour2, Therese Leblois3

  • 1FEMTO-ST Institute, Université de Franche-Comté, 15B avenue des Montboucons, 25030 Besançon Cedex, France. tony.chopard@gmail.com.

Sensors (Basel, Switzerland)
|December 5, 2014
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Summary

This study presents a novel GaAs sensor for highly sensitive mass detection. The simple design improves early disease diagnosis by achieving a relative voltage variation of 8%/1 fg for detecting minute masses.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • High sensitivity mass detection is crucial for early disease diagnosis.
  • Current methods often require complex processes and result in brittle structures.
  • Coupled structures offer a promising alternative for enhanced sensor performance.

Purpose of the Study:

  • To demonstrate improved mass detection sensitivity and time response using a simple sensor structure.
  • To develop an alternative to complex and brittle sensing technologies for biological applications.
  • To enhance early disease diagnosis through advanced molecular detection.

Main Methods:

  • Utilizing piezoelectric excitation and detection of two gallium arsenide (GaAs) microstructures vibrating in antisymmetric modes.
  • Employing a specific device design to enhance detection of low masses.
  • Developing an original detection method based on amplitude variation at the initial resonance frequency.

Main Results:

  • Achieved a relative voltage variation of 8%/1 fg, indicating high resolution for minute mass detection.
  • Demonstrated the ease of micromachining GaAs using standard cleanroom processes.
  • Showcased the potential of GaAs for direct biofunctionalization in biological fields.

Conclusions:

  • The developed GaAs sensor offers a simple yet highly sensitive solution for mass detection.
  • The novel detection method provides excellent resolution for detecting extremely small masses.
  • This technology holds significant promise for advancing early disease diagnosis and biosensing applications.