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Related Concept Videos

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

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...
Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

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...
Mass Analyzers: Overview01:13

Mass Analyzers: Overview

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...
Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

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...
Mass Spectrometers01:16

Mass Spectrometers

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

High-Resolution Mass Spectrometry (HRMS)

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 example, the mass of helium...

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A Strategy for Sensitive, Large Scale Quantitative Metabolomics
14:18

A Strategy for Sensitive, Large Scale Quantitative Metabolomics

Published on: May 27, 2014

Linear quadrupoles in mass spectrometry.

D J Douglas1

  • 1Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, Canada V6T 1Z1. douglas@chem.ubc.ca

Mass Spectrometry Reviews
|June 4, 2009
PubMed
Summary
This summary is machine-generated.

This review explores linear quadrupoles in mass spectrometry, detailing their function as mass filters and ion guides. Advanced techniques like "islands of stability" and "mass selective axial ejection" are discussed for enhanced mass analysis.

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Area of Science:

  • Analytical Chemistry
  • Physical Chemistry

Background:

  • Linear quadrupoles are fundamental components in mass spectrometry.
  • Their roles as mass filters and ion guides are critical for ion manipulation and detection.

Purpose of the Study:

  • To provide a comprehensive review of linear quadrupole applications in mass spectrometry.
  • To discuss various mass analysis methods and operational principles.
  • To explore advanced and emerging quadrupole-based techniques.

Main Methods:

  • Review of established quadrupole mass filter principles and operation.
  • Discussion of extensions to higher masses and alternative waveform operations.
  • Examination of novel methods like "islands of stability" and "mass selective axial ejection".

Main Results:

  • Optimal electrode geometry for round-rod quadrupole mass filters is detailed.
  • The impact of collisional cooling and axial fields on quadrupole ion guides is analyzed.
  • Mass analysis using quadrupoles with geometric and field distortions is explored.

Conclusions:

  • Linear quadrupoles offer versatile capabilities for mass analysis in spectrometry.
  • Advanced techniques provide enhanced performance and broader applicability.
  • Understanding quadrupole principles is key to optimizing mass spectrometry instrumentation.