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- Title
Laser desorption lamp ionization source for ion trap mass spectrometry.
- Authors
Wu, Qinghao; Zare, Richard N.
- Abstract
A two-step laser desorption lamp ionization source coupled to an ion trap mass spectrometer (LDLI-ITMS) has been constructed and characterized. The pulsed infrared (IR) output of an Nd:YAG laser (1064 nm) is directed to a target inside a chamber evacuated to ~15 Pa causing desorption of molecules from the target's surface. The desorbed molecules are ionized by a vacuum ultraviolet (VUV) lamp (filled with xenon, major wavelength at 148 nm). The resulting ions are stored and detected in a three-dimensional quadrupole ion trap modified from a Finnigan Mat LCQ mass spectrometer operated at a pressure of ≥ 0.004 Pa. The limit of detection for desorbed coronene molecules is 1.5 pmol, which is about two orders of magnitude more sensitive than laser desorption laser ionization mass spectrometry using a fluorine excimer laser (157 nm) as the ionization source. The mass spectrum of four standard aromatic compounds (pyrene, coronene, rubrene and 1,4,8,11,15,18,22,25-octabutoxy-29H,31H-phthalocyanine (OPC)) shows that parent ions dominate. By increasing the infrared laser power, this instrument is capable of detecting inorganic compounds. Copyright © 2015 John Wiley & Sons, Ltd.
- Subjects
DESORPTION ionization mass spectrometry; ION traps; MASS spectrometry; MASS spectrometers; PHOTOIONIZATION; AROMATIC compounds spectra
- Publication
Journal of Mass Spectrometry, 2015, Vol 50, Issue 1, p160
- ISSN
1076-5174
- Publication type
Article
- DOI
10.1002/jms.3509