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Related Concept Videos

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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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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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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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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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Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
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In inductively coupled plasma–mass spectrometry (ICP–MS), an inductively coupled plasma (ICP) torch is used as an atomizer and ionizer. Solid samples are dissolved and volatilized before being introduced into the high-temperature argon plasma, while solution samples are nebulized and passed through the high-temperature argon plasma. Plasma dissociates the analytes and ionizes their component atoms to form a mixture of positive ions and molecular species. The positive ions are then...
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Single analyzer precursor scans using an ion trap.

Dalton T Snyder1, Christopher J Pulliam1, R Graham Cooks1

  • 1Department of Chemistry and Center for Analytical Instrumentation Development, Purdue University, West Lafayette, IN, 47907, USA.

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Summary
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Researchers demonstrate precursor ion scans in single ion traps using secular frequency scanning. This simplifies tandem mass spectrometry (MS/MS) instruments by enabling complex analyses on simpler devices.

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry
  • Spectroscopy

Background:

  • Precursor ion and neutral loss scans are essential tandem mass spectrometry (MS/MS) survey methods for identifying related compounds.
  • These methods traditionally require complex, multiple-analyzer instruments like triple quadrupoles or hybrid MS/MS systems.
  • Implementing precursor ion scans in single mass analyzers could significantly reduce instrument complexity and cost.

Purpose of the Study:

  • To investigate the feasibility of performing precursor ion scans within a single ion trap.
  • To develop a method for simplifying tandem mass spectrometry (MS/MS) instrumentation.
  • To demonstrate precursor ion scanning capabilities in a miniature mass spectrometer.

Main Methods:

  • Utilized secular frequency scanning for mass-selective excitation of trapped ions in a single ion trap.
  • Employed a supplementary alternating current (ac) signal swept in frequency for ion excitation.
  • Applied a fixed amplitude ac signal at the product ion's secular frequency to eject specific ions and generate precursor ion spectra.

Main Results:

  • Successfully demonstrated precursor ion scanning within a single ion trap.
  • Validated the method using a mixture of cocaine, MDA, and MDMA.
  • Confirmed that acquired spectral data corresponds to precursor ion scans by analyzing frequency-dependent responses.

Conclusions:

  • Secular frequency scanning combined with product ion ejection enables precursor scans in single ion traps.
  • This novel approach simplifies MS/MS instrumentation, applicable to miniature linear ion traps and potentially quadrupole mass filters.
  • The findings offer a pathway towards more accessible and less complex mass spectrometry analysis.