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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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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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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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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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The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte...
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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Probing chemical dynamics with negative ions.

Daniel M Neumark1

  • 1Department of Chemistry,University of California, Berkeley, California 94720, USA. dneumark@berkeley.edu

The Journal of Chemical Physics
|October 13, 2006
PubMed
Summary

This study reviews experiments using negative ion photodetachment and photoexcitation to explore chemical dynamics. Key areas include biomolecular reactions, van der Waals complexes, and free radical photodissociation.

Area of Science:

  • Physical Chemistry
  • Chemical Physics
  • Spectroscopy

Background:

  • Negative ions are crucial intermediates in various chemical processes.
  • Understanding chemical dynamics requires probing reaction pathways and molecular interactions.
  • Photoddetachment and photoexcitation offer unique ways to study these systems.

Purpose of the Study:

  • To review experimental investigations of chemical dynamics using negative ion-based techniques.
  • To highlight the application of these methods in diverse chemical systems.
  • To describe the experimental approaches and studied examples.

Main Methods:

  • Photodetachment of negative ions
  • Photoexcitation of negative ions
  • Spectroscopic analysis of resulting species

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  • Time-resolved measurements

    • Main Results:

    • Demonstrated applicability to transition state spectroscopy of biomolecular reactions.
    • Enabled spectroscopy of open-shell van der Waals complexes.
    • Facilitated studies of free radical photodissociation.
    • Provided insights into time-resolved dynamics in clusters.

    Conclusions:

    • Negative ion photophysics is a powerful tool for chemical dynamics research.
    • These methods offer versatile approaches to fundamental chemical problems.
    • The reviewed experiments showcase significant advancements in understanding molecular behavior.