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Updated: Feb 1, 2026
09:53
Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet VUV Synchrotron Radiation
Published on: October 30, 2012
13.6K
Enabling liquid vapor analysis using synchrotron VUV single photon ionization mass spectrometry with a microfluidic
1Atmospheric Sciences and Global Change Division, PNNL, Richland, Washington 99354, USA.
The Review of Scientific Instruments
|December 4, 2018
Summary
This study demonstrates the first in situ liquid analysis using vacuum ultraviolet (VUV) single photon ionization mass spectrometry (SPI-MS) with a microfluidic interface. This breakthrough enables direct study of volatile organic compounds (VOCs) from liquid surfaces.
Area of Science:
- Analytical Chemistry
- Surface Science
- Physical Chemistry
Background:
- Vacuum ultraviolet (VUV) single photon ionization mass spectrometry (SPI-MS) is typically limited to gas and solid samples.
- Analyzing volatile liquids in a vacuum presents significant technical challenges.
- Previous methods could not directly analyze liquid samples in situ with VUV SPI-MS.
Purpose of the Study:
- To demonstrate the first in situ liquid analysis using VUV SPI-MS.
- To integrate the System for Analysis at the Liquid Vacuum Interface (SALVI) microfluidic reactor with VUV SPI-MS.
- To analyze volatile organic compounds (VOCs) in liquid solutions.
Main Methods:
- Integration of the SALVI microfluidic reactor with VUV SPI-MS.
- Analysis of four representative volatile organic compound (VOC) solutions.
- Utilizing synchrotron beamline for vacuum-compatible interface.
Main Results:
- Accurate mass identification of VOC molecules from liquid samples.
- Reliable determination of appearance energies for VOCs.
- Demonstrated consistency with literature values for ionization energies of gaseous species.
Conclusions:
- The vacuum-compatible SALVI microfluidic interface enables in situ liquid analysis with VUV SPI-MS.
- This technique allows for the study of gas-phase molecules evaporating from liquid surfaces.
- The method is crucial for advancing condensed matter chemistry research.
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