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Mass Spectrometry: Overview01:19

Mass Spectrometry: Overview

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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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Mass Spectrometry Using Nanomechanical Systems: Beyond the Point-Mass Approximation.

John E Sader1,2, M Selim Hanay2,3, Adam P Neumann2

  • 1ARC Centre of Excellence in Exciton Science, School of Mathematics and Statistics , The University of Melbourne , Victoria 3010 , Australia.

Nano Letters
|January 26, 2018
PubMed
Summary

Researchers developed a simpler method for "inertial imaging" of single molecules using nanomechanical resonators. This technique allows for detailed spatial characterization of nanoscale adsorbates, advancing molecular imaging capabilities.

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Area of Science:

  • Nanotechnology
  • Physical Chemistry
  • Materials Science

Background:

  • Single-molecule mass measurement is routinely done with resonant nanomechanical devices, treating molecules as point particles.
  • Recent advancements enable spatial characterization of adsorbates using multimode measurements, termed 'inertial imaging'.
  • Current inertial imaging relies on virtual re-engineering of resonator modes via superposition of frequency shifts.

Purpose of the Study:

  • To present a simplified and complementary methodology for analyzing inertial imaging measurements.
  • To enable broader implementation of inertial imaging for nanoscale adsorbate characterization.
  • To facilitate novel studies of nanoscale adsorbates' spatial extent and properties.

Main Methods:

  • Development of a streamlined analysis methodology for inertial imaging data.
  • Utilized linear superposition of measured frequency shifts from multimode measurements.
  • Provided accompanying software to facilitate implementation of the new analysis method.

Main Results:

  • The new methodology achieves performance comparable to existing inertial imaging techniques.
  • The simplified approach streamlines the implementation of spatial characterization of adsorbates.
  • Demonstrated a practical tool for analyzing complex nanomechanical resonator data.

Conclusions:

  • The developed methodology offers a more accessible approach to inertial imaging.
  • This advancement broadens the applicability of nanomechanical resonators for molecular imaging.
  • Opens new avenues for detailed characterization studies of single nanoscale adsorbates.