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Related Concept Videos

Mass Spectrometers01:16

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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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Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.Matrix-assisted laser desorption ionization (MALDI) is a commonly...
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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 spectrometry is an analytical technique used to determine the molecular mass and molecular formula of a compound. The basic principle of mass spectrometry is to generate ions from the analyte molecule and measure these ion abundances against their molecular mass. One common type of ionization, known as electron ionization or EI, bombards the analyte molecules in the gas phase with high-energy electron beams. The electron beams displace an electron from the molecule and leave behind a...
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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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Mass Spectrometry: Complex Analysis01:21

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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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Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments
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Differential mobility spectrometry-mass spectrometry for atomic analysis.

Francy L Sinatra1, Tianpeng Wu, Spiros Manolakos

  • 1Draper Laboratory , 3802 Spectrum Blvd. Ste 201, Tampa, Florida 33612, United States.

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|December 19, 2014
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Differential mobility spectrometry (DMS) can now separate atomic ions, crucial for forensic radiological debris analysis. This new method aids rapid identification, even for ions indistinguishable by mass spectrometry.

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Area of Science:

  • Analytical Chemistry
  • Spectrometry
  • Forensic Science

Background:

  • Ion mobility spectrometry (IMS) separates atomic ions, while differential mobility spectrometry (DMS) primarily separates molecular components.
  • Portable analysis of atomic ions is critical for forensic applications, particularly in radiological debris analysis.
  • Distinguishing isobaric ions, which have the same mass-to-charge ratio, presents a significant analytical challenge.

Purpose of the Study:

  • To investigate the potential of differential mobility spectrometry (DMS) for separating atomic ions.
  • To develop a novel method for deriving the differential ion mobility parameter (alpha) from existing ion mobility spectrometry (IMS) data.
  • To validate the use of DMS for rapid atomic ion analysis, especially for isobaric ions.

Main Methods:

  • Derived the differential ion mobility parameter (alpha) from empirical IMS data of cesium and potassium.
  • Applied derived alpha functions to DMS simulations and analytical treatments.
  • Experimentally validated the DMS method using a cesium-potassium system coupled with mass spectrometry (MS).

Main Results:

  • Demonstrated that DMS can effectively separate atomic ions, contrary to its typical focus on molecular components.
  • Developed a novel method for deriving and translating experimental DMS data into alpha parameters.
  • Successfully distinguished between cesium and potassium atomic ions using DMS, showcasing its potential for resolving isobaric species.

Conclusions:

  • Differential mobility spectrometry (DMS) is a viable technique for separating atomic ions.
  • The derived differential ion mobility parameter (alpha) provides a means for rapid disambiguation of atomic ions.
  • This advancement is particularly beneficial for field-portable instruments used in forensic radiological debris analysis, offering rapid atomic analysis capabilities.