Flow-through charge detection mass spectrometry to categorize micron-sized particles.

Area of Science:

• Analytical Chemistry
• Planetary Science
• Instrument Development

Background:

• Accurate characterization of micron-sized particles is essential for various scientific disciplines.
• Previous methods for measuring both charge and mass of individual particles simultaneously have limitations.

Purpose of the Study:

• To develop and validate a charge detection mass spectrometry technique for simultaneous measurement of particle charge and mass.
• To assess the applicability of this technique for analyzing extraterrestrial dust, specifically Martian dust.

Main Methods:

• Utilized a flow-through instrument employing charge induction onto cylindrical electrodes connected to a differential amplifier for charge detection.
• Determined particle mass by measuring acceleration under a controlled electric field.

Main Results:

• Successfully measured mass and charge of micron-sized particles (30-400 fg, 3-7 µm diameter).
• Achieved 10% accuracy for particles up to 620 fg with a charge range of 500e⁻ to 56 ke⁻.
• Demonstrated the potential relevance of the measured charge and mass ranges for Martian dust analysis.

Conclusions:

• The developed charge detection mass spectrometry method provides a robust tool for simultaneous particle charge and mass analysis.
• The technique's demonstrated capabilities are highly relevant for in-situ analysis of extraterrestrial dust, including Martian dust.