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Mass Analyzers: Overview01:13

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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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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 resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
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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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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
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High-speed multiple-mode mass-sensing resolves dynamic nanoscale mass distributions.

Selim Olcum1, Nathan Cermak2, Steven C Wasserman3

  • 1Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

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|May 13, 2015
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Summary
This summary is machine-generated.

This study introduces a new platform for faster nanomechanical resonator measurements, enabling precise tracking of fast signals. This breakthrough allows for accurate determination of nanoparticle position and mass during transit.

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Area of Science:

  • Nanotechnology
  • Mechanical Engineering
  • Analytical Chemistry

Background:

  • Nanomechanical resonators are crucial for detecting nanoscale analytes.
  • Current measurement techniques are limited by low bandwidth (<1 Hz), restricting throughput and transient signal analysis.
  • Accurate mass and position determination of adsorbed proteins and nanoscale analytes is a key challenge.

Purpose of the Study:

  • To develop a general platform for independently and simultaneously oscillating multiple modes of mechanical resonators.
  • To enable high-bandwidth frequency measurements for tracking fast transient signals.
  • To demonstrate precise position and mass determination of multiple nanoparticles in real-time.

Main Methods:

  • Development of a general platform for multi-mode oscillation of mechanical resonators.
  • Implementation of frequency measurements with a user-defined bandwidth exceeding 500 Hz.
  • Simultaneous tracking of multiple nanoparticles flowing through a suspended nanochannel resonator.

Main Results:

  • Achieved high-bandwidth frequency measurements (>500 Hz) for precise tracking of fast transient signals.
  • Successfully resolved signals from multiple nanoparticles transiting simultaneously.
  • Determined individual nanoparticle position (accuracy ~150 nm) and mass (accuracy ~40 attograms) during their 150-ms transit using four resonant modes.

Conclusions:

  • The developed platform significantly enhances measurement bandwidth for nanomechanical resonators.
  • This method enables real-time, high-accuracy position and mass determination of multiple nanoscale analytes.
  • The platform is extensible to increase bandwidth, mode count, or resonator count for broader applications.