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Electrospray Ionization (ESI) Mass Spectrometry01:12

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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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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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Related Experiment Video

Updated: May 3, 2026

Real-time Breath Analysis by Using Secondary Nanoelectrospray Ionization Coupled to High Resolution Mass Spectrometry
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A hydrodynamically optimized nano-electrospray ionization source and vacuum interface.

M Pauly1, M Sroka, J Reiss

  • 1Max-Planck-Institute for Solid State Research, Heisenbergstr. 1, D-70567 Stuttgart, Germany. matthias.pauly@ics-cnrs.unistra.fr s.rauschenbach@fkf.mpg.de.

The Analyst
|January 31, 2014
PubMed
Summary

This study presents a novel nano-electrospray ionization (nano-ESI) vacuum interface that overcomes ion transfer limitations. The optimized interface achieves 100% ion current transmission, enabling efficient electrospray ion beam deposition (ES-IBD) for surface coating.

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Area of Science:

  • Analytical Chemistry
  • Surface Science
  • Vacuum Technology

Background:

  • Coupling atmospheric pressure ionization (API) sources to vacuum systems (e.g., mass spectrometry, ion beam deposition) is crucial but limited by low ion transfer efficiency at the inlet.
  • Conventional capillary or pinhole inlets act as bottlenecks, hindering efficient ion transport.

Purpose of the Study:

  • To develop and validate a nano-electrospray ionization (nano-ESI) vacuum interface that enhances ion transfer efficiency.
  • To overcome the limitations of conventional inlets for API-to-vacuum coupling.

Main Methods:

  • Design and optimization of a nano-ESI vacuum interface exploiting hydrodynamic drag for ion collimation and space charge reduction.
  • Utilizing computational fluid dynamics (CFD) modeling and ion transport simulations to understand ion cloud behavior.
  • Experimental validation using mass spectrometry (MS) and ion beam deposition (IBD) with nano-ESI.

Main Results:

  • Achieved 100% ion current transmission up to a 40 nA space charge limit through the optimized capillary inlet.
  • Demonstrated well-defined ion beams free of additional contamination compared to conventional interfaces.
  • Mass-selected ion currents in the nanoampere range were achieved downstream in high vacuum.

Conclusions:

  • The novel nano-ESI vacuum interface significantly improves ion transfer efficiency by leveraging hydrodynamic drag.
  • This advancement enables efficient electrospray ion beam deposition (ES-IBD) for surface coating applications.
  • The optimized interface opens new possibilities for utilizing high-current ion beams in vacuum-based processes.