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Related Concept Videos

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

2.0K
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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High-Resolution Mass Spectrometry (HRMS)01:15

High-Resolution Mass Spectrometry (HRMS)

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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 Analyzers: Overview01:13

Mass Analyzers: Overview

2.1K
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 Spectrum: Interpretation01:24

Mass Spectrum: Interpretation

4.1K
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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Mass Spectrometers01:16

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:
9.6K
Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

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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.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
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Related Experiment Video

Updated: May 5, 2026

An HS-MRM Assay for the Quantification of Host-cell Proteins in Protein Biopharmaceuticals by Liquid Chromatography Ion Mobility QTOF Mass Spectrometry
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High resolution on a quadrupole ion trap mass spectrometer.

J C Schwartz1, J E Syka, I Jardine

  • 1Finnigan MAT, 355 River Oaks Parkway, 95134, San Jose, CA.

Journal of the American Society for Mass Spectrometry
|November 19, 2013
PubMed
Summary

High-resolution ion trap mass spectrometry was achieved by modifying the scanning rate and employing resonance ejection. This advancement enhances mass spectrometry resolution for detailed molecular analysis.

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry

Background:

  • Ion trap mass spectrometry (ITMS) is a powerful analytical technique.
  • Achieving high resolution is crucial for accurate mass measurements and compound identification.

Purpose of the Study:

  • To demonstrate a method for significantly increasing resolution in ITMS.
  • To provide a theoretical framework for the observed resolution enhancement.

Main Methods:

  • Utilized a modified ion trap mass spectrometer.
  • Operated the instrument in mass-selective instability mode.
  • Decreased the scanning rate of the primary radio frequency amplitude.
  • Employed resonance ejection at specific frequency and amplitude settings.

Main Results:

  • Achieved resolution exceeding 30,000 (FWHM) at m/z 502.
  • Demonstrated the effectiveness of the modified scanning and resonance ejection technique.

Conclusions:

  • The developed method offers a significant improvement in ion trap mass spectrometer resolution.
  • This technique enhances the capability of ITMS for complex mixture analysis and trace compound detection.