Laser Desorption Combined with Laser Postionization for Mass Spectrometry

Area of Science:

• Analytical Chemistry
• Spectroscopy
• Materials Science

Background:

• Lasers are utilized for desorption/ablation in mass spectrometry across various wavelengths and pulse durations.
• Laser postionization of neutrals offers significant advantages over traditional methods.

Purpose of the Study:

• To review and discuss the applications and benefits of laser postionization in mass spectrometry.
• To explore different postionization strategies and their impact on sample analysis.

Main Methods:

• Utilizing lasers with pulse lengths from nanoseconds to femtoseconds and wavelengths from mid-infrared to extreme ultraviolet (UV).
• Investigating various postionization techniques including vacuum UV, multiphoton, and short pulse methods.
• Analyzing the effects of laser pulse length and wavelength on laser desorption/ablation.

Main Results:

• Laser postionization allows for matrix-free analysis, high lateral resolution, and analysis of electrically insulating samples.
• Techniques like vacuum UV postionization, multiphoton ionization, and direct laser desorption/ionization are detailed.
• The study considers factors such as gaseous collisions, ambient pressure sampling, and UV postionization for MALDI.

Conclusions:

• Laser postionization is a versatile technique that significantly enhances mass spectrometry performance.
• It offers improved sensitivity, depth profiling, and analysis of challenging samples.
• Further research explores ambient pressure applications and integration with techniques like MALDI.