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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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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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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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An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...
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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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Development and Evaluation of a Variable-Temperature Quadrupole Ion Trap Mass Spectrometer.

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|October 21, 2015
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Researchers developed a variable-temperature mass spectrometer system by modifying an ion trap. This innovation allows precise temperature control for enhanced chemical analysis and thermochemistry studies.

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Area of Science:

  • Analytical Chemistry
  • Physical Chemistry
  • Instrument Development

Background:

  • Ion trap mass spectrometry is a powerful analytical technique.
  • Precise temperature control is crucial for studying gas-phase equilibrium processes and thermochemistry.
  • Existing commercial ion traps typically operate at fixed temperatures, limiting their application in variable-temperature studies.

Purpose of the Study:

  • To develop a cost-effective method for converting commercial ion trap mass spectrometers into variable-temperature instruments.
  • To enable accurate measurement of thermochemical data using ion trap mass spectrometry.
  • To assess the feasibility and reliability of temperature modulation in an ion trap system.

Main Methods:

  • Modification of a Bruker Esquire ion trap by applying polyimide heating tape to the end-cap electrodes.
  • System temperature was varied between 40 and 100°C.
  • Accuracy of temperature control was validated using two gas-phase equilibrium processes with known thermochemistry.

Main Results:

  • The modified ion trap system successfully achieved variable temperatures from 40 to 100°C.
  • The heating modification did not impede the normal operation of the ion trap.
  • Extended use of the heater showed no degradation of the system's performance.
  • Experimental data from equilibrium processes closely matched literature values, confirming accurate temperature modulation.

Conclusions:

  • Commercial ion trap mass spectrometers can be effectively converted into variable-temperature instruments using a simple modification.
  • This approach provides a convenient and reliable method for thermochemical studies using ion trap mass spectrometry.
  • The developed system enhances the utility of ion traps for investigating temperature-dependent chemical processes.