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Chemical Ionization (CI) Mass Spectrometry01:21

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The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...
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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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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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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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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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Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
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Correlation ion mobility spectrometry.

Austen L Davis1, Wenjie Liu1, William F Siems1

  • 1Department of Chemistry, Washington State University, Pullman, Washington 99164, USA. brian.clowers@wsu.edu.

The Analyst
|December 15, 2016
PubMed
Summary
This summary is machine-generated.

We introduce Correlation Ion Mobility Spectrometry-Mass Spectrometry (CIMS) using a linear sweep and cross-correlation for high-resolution spectra. This method minimizes artifacts and maximizes ion throughput, offering advantages over traditional techniques.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Physical Chemistry

Background:

  • Ion Mobility Spectrometry-Mass Spectrometry (IMS-MS) is a powerful analytical technique.
  • Current multiplexing methods in IMS-MS, such as Hadamard and Fourier transforms, can introduce artifacts and limit ion throughput.
  • Developing advanced signal processing techniques is crucial for enhancing IMS-MS spectral resolution and data quality.

Purpose of the Study:

  • To present a novel method for obtaining high-resolution IMS-MS spectra using a linearly swept chirp function and cross-correlation signal processing.
  • To demonstrate the advantages of Correlation IMS (CIMS) over existing multiplexing techniques in IMS-MS.
  • To achieve ion gate duty cycles approaching 50% and resolving powers near the theoretical limit.

Main Methods:

  • Modulation of a Bradbury-Nielsen (BN) ion gate using a linearly swept chirp function.
  • Application of cross-correlation signal processing to analyze the ion gate response.
  • Acquisition of IMS-MS spectra with high resolution and ion gate duty cycles approaching 50%.

Main Results:

  • The developed Correlation IMS (CIMS) method achieves high-resolution IMS-MS spectra.
  • CIMS minimizes transform artifacts commonly seen in Hadamard and Fourier transform approaches.
  • The technique maintains high ion throughput and approaches theoretical resolving power limits.
  • Data sampling rates in CIMS are independent of terminal frequency, unlike FFT-derived spectra.

Conclusions:

  • Correlation IMS (CIMS) represents a significant advancement in IMS-MS analysis.
  • This method offers superior spectral quality and efficiency compared to current multiplexing techniques.
  • CIMS leverages unique aspects of ion mobility experiments, including non-linear ion responses and intensity fluctuations, for enhanced spectral data.