Highly sensitive single-molecule detection of macromolecule ion beams

Area of Science:

• Mass Spectrometry
• Materials Science
• Physical Chemistry

Background:

• Gas-phase protein analysis requires highly efficient detectors with precise spatial resolution.
• Existing secondary electron multipliers have limitations for macromolecules at lower impact energies.
• Superconducting detectors have shown promise for high-energy particle detection in time-of-flight mass spectrometry.

Purpose of the Study:

• To demonstrate the suitability of superconducting nanowire detectors for quadrupole mass spectrometry.
• To evaluate the quantum yield and sensitivity of these detectors at low impact energies.
• To explore novel applications and advancements in detector technology for molecular analysis.

Main Methods:

• Utilized superconducting nanowire detectors in conjunction with quadrupole mass spectrometry.
• Investigated detector performance at impact energies as low as 100 eV.
• Developed advanced cryogenic electronics for detector integration.

Main Results:

• Superconducting nanowire detectors exhibit outstanding quantum yield at low impact energies (100 eV).
• Detector sensitivity surpasses conventional ion detectors by three orders of magnitude.
• Demonstrated capability for 2D ion beam profiling and gas-phase photochemistry experiments.

Conclusions:

• Superconducting nanowire detectors are exceptionally well-suited for quadrupole mass spectrometry, especially at low energies.
• These detectors enable discrimination of molecules based on impact energy and charge.
• The developed technology paves the way for highly integrated and sensitive molecular analysis systems.