title: A deflection system to reduce the interference from post-source decay product ions in photodissociation tandem time-of-flight mass spectrometry.
abstract: A deflection system consisting of four deflectors was designed and used to reduce the interference from post-source decay (PSD) product ions in photodissociation (PD) tandem time-of-flight (TOF) mass spectrometry. For simple protonated peptides generated by matrix-assisted laser desorption/ionization, the presence of PSD product ions at the laser irradiation spot was found to noticeably alter the minor peaks in the PD spectra even though the major ones were hardly affected. Other benefits from the use of the deflection system such as the improvement in the resolving power in PSD tandem mass spectra are discussed.
authors.affiliation: National Creative Research Initiative Center for Control of Reaction Dynamics and School of Chemistry, Seoul National University, Seoul 151-742, Korea.
authors.forename: So Hee
authors.initials: SH
authors.lastname: Yoon
authors.forename: Jeong Hee
authors.initials: JH
authors.lastname: Moon
authors.forename: Kyung Mi
authors.initials: KM
authors.lastname: Choi
authors.forename: Myung Soo
authors.initials: MS
authors.lastname: Kim
mesh_terms: D010449:Peptide Mapping; D010455:Peptides / Q000032:analysis / Q000737:chemistry*; D010777:Photochemistry / Q000379:methods*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000295:instrumentation* / Q000379:methods; D053719:Tandem Mass Spectrometry / Q000295:instrumentation* / Q000379:methods
chemical_list: D010455:Peptides