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Laser Desorption Lamp Ionization Source for Ion Trap Mass Spectrometry

Laser Desorption Lamp Ionization Source for Ion Trap Mass Spectrometry

Qinghao Wu, Richard N Zare

J Mass Spectrom. 2015 Jan;50(1):160-4.

PMID: 25601688

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP116453737	1,4,8,11,15,18,22,25-Octabutoxy-29H,31H-phthalocyanine		116453-73-7	Price

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