Continuous time-of-flight ion imaging: application to fragmentation

Area of Science:

• Analytical Chemistry
• Mass Spectrometry
• Spectroscopy

Background:

• Traditional time-of-flight mass spectrometers (TOFMS) often have limited duty cycles, impacting data acquisition speed and sensitivity.
• Achieving high-resolution mass spectra with spatial information is crucial for complex sample analysis.

Purpose of the Study:

• To develop and demonstrate a continuous imaging reflectron TOFMS with a 100% duty cycle.
• To enable mass spectral analysis at every pixel of a 2D image.
• To improve data precision for fast analytical processes.

Main Methods:

• Design and construction of a continuous imaging reflectron TOFMS.
• Implementation of pseudorandom ion beam modulation and 3D (x, y, t) ion imaging.
• Utilizing a multichannel plate detector with a delay-line anode for ion event recording.

Main Results:

• The developed TOFMS system achieves a 100% duty cycle, providing a mass spectrum for each image pixel.
• Enhanced precision in mass spectral peak heights was observed, even with short acquisition times (10 ms).
• Successful imaging of ions undergoing surface-induced dissociation and post-source decay fragmentation was demonstrated.

Conclusions:

• The continuous imaging reflectron TOFMS offers significant improvements in data acquisition and precision.
• The system's capabilities are well-suited for studying fast dynamic processes like solution kinetics and chromatographic separations.
• This technology opens new avenues for spatially resolved mass spectrometry.