Optically timed submillimeter time-of-flight mass spectrometry

Area of Science:

• Atomic, Molecular, and Optical Physics
• Mass Spectrometry
• Laser Spectroscopy

Background:

• Time-of-flight mass spectrometry (TOF-MS) is a powerful analytical technique.
• Optical methods for timing ion flight in TOF-MS are continuously being explored.
• Femtosecond laser pulses offer precise temporal control for advanced spectroscopic methods.

Purpose of the Study:

• To demonstrate a miniature time-of-flight mass spectrometer using femtosecond laser pulses.
• To optically time ion flight for mass-resolved detection.
• To investigate the feasibility of this method for isotope analysis.

Main Methods:

• Utilizing intense femtosecond laser pulses for molecular ionization.
• Employing a static electric field to accelerate ions.
• Using a second, time-delayed laser pulse for ion detection.
• Varying laser focus positions and pulse timing to control ion flight distance and time.
• Applying double ionization or Coulomb explosion detection methods.

Main Results:

• Successful demonstration of a miniature time-of-flight mass spectrometer.
• Mass resolution of CS(2) and C(6)H(6) isotopes achieved.
• Demonstrated isotope detection after a short flight distance (360 microm).
• Validation of optical ion flight timing using femtosecond laser pulses.

Conclusions:

• Femtosecond laser pulses can be effectively used to create a miniature TOF-MS.
• Optical timing of ion flight provides a viable alternative for mass spectrometry.
• This technique shows promise for high-resolution isotope analysis in compact systems.