193 nm Laser Photoionization and Photodissociation for Isomer Differentiation in Fourier-Transform Mass Spectrometry

✍ Scribed by Evan R. Williams; Fred W. McLafferty

• Book ID: 103995478
• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 460 KB
• Volume: 1
• Category: Article
• ISSN: 1044-0305
• DOI: 10.1016/1044-0305(90)85015-e

✦ Synopsis

Energetic (6.4 eV) multiphoton ionization (MPI) or photodissociation, effected interchangeably in a Fourier-transform mass spectrometer, can differentiate isomers that yield similar electron ionization spectra. Selectivity is shown for isomers of C,Ha, CrHpN, C,H,F, CsHlo, but not of GHsCls and CIaHls. The contrasting Ml'1 fragmentations and ionization efficiencies, as well as high sensitivities, are of substantial analytical utility. The high ionization efficiency makes possible high resolution MPI spectra, such as 470,000 (FWHH) for the molecular ion of anthracene, from a single laser pulse. ( 1