✦ LIBER ✦

Deflection of laser-produced ions in laser-induced thermal-desorption/Fourier-transform mass spectrometry for surface analysis

✍ Scribed by Nick A. Thornburg; Ihab M. Abdelrehim; Steve Pullins; Donald P. Land

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 525 KB
Volume: 5
Category: Article
ISSN: 1044-0305
DOI: 10.1016/1044-0305(94)90008-6

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✦ Synopsis

A method for deflecting ions, such as K+, produced outside a Fourier-transform mass spectrometer cell during laser-induced thermal desorption, is described. This technique has been shown to deflect laser-generated K and Ti ions from two Ti foil samples (biomedical implant model surfaces), yielding mass spectra of coadsorbed organic species. Further studies characterizing the laser desorption/deflection parameters have shown that ion deflection improves with higher deflection voltages and greater sample to Fourier-transform mass spectrometry cell separation. Higher laser power densities resulted in greater surface ion production; hence higher deflection voltages were necessary. A 6% increase in laser power necessitated a fourfold increase in deflection voltage for the Ti sample. (

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