Infrared multiphoton dissociation in quadrupole ion traps.

Area of Science:

• Mass spectrometry
• Analytical chemistry
• Physical chemistry

Background:

• Ion activation/dissociation is crucial for determining ion structures, binding energies, and identifying compounds in mixtures.
• Collisional activated dissociation (CAD) is the standard but has limitations for large molecules.
• New activation methods are needed to overcome CAD's limitations in energy deposition.

Purpose of the Study:

• To review infrared multiphoton dissociation (IRMPD) in quadrupole ion trap mass spectrometry.
• To compare IRMPD with CAD and discuss methods to enhance IRMPD efficiency.
• To highlight applications of IRMPD in analyzing various classes of molecules.

Main Methods:

• Photodissociation using lasers to irradiate ions with UV, visible, or IR photons.
• Infrared multiphoton dissociation (IRMPD) specifically within quadrupole ion trap mass spectrometry.
• Comparison of energy deposition and efficiency between photodissociation and CAD.

Main Results:

• Photodissociation offers rapid, efficient, and potentially high energy deposition.
• IRMPD is a viable alternative to CAD, especially for molecules like large proteins.
• IRMPD has demonstrated utility in analyzing drugs, peptides, nucleic acids, and oligosaccharides.

Conclusions:

• Infrared multiphoton dissociation is a powerful ion activation technique for mass spectrometry.
• IRMPD provides a valuable alternative to CAD, expanding analytical capabilities.
• Further development and application of IRMPD will advance molecular analysis.