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Femtosecond laser time‐of‐flight mass spectrometry of labile molecular analytes: laser‐desorbed nitro‐aromatic molecules
Author(s) -
Hankin S. M.,
Tasker A. D.,
Robson L.,
Ledingham K. W. D.,
Fang X.,
McKenna P.,
McCanny T.,
Singhal R. P.,
Kosmidis C.,
Tzallas P.,
Jaroszynski D. A.,
Jones D. R.,
Issac R. C.,
Jamison S.
Publication year - 2001
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.553
Subject(s) - chemistry , femtosecond , mass spectrometry , laser , mass spectrum , analytical chemistry (journal) , ionization , matrix assisted laser desorption electrospray ionization , polyatomic ion , desorption , molecule , soft laser desorption , atmospheric pressure laser ionization , fragmentation (computing) , time of flight mass spectrometry , ion , electron ionization , matrix assisted laser desorption/ionization , optics , chromatography , adsorption , organic chemistry , physics , computer science , operating system
Femtosecond laser time‐of‐flight mass spectra of solid samples of trinitrobenzene (TNB), trinitrotoluene (TNT) and trinitrophenol (TNP) have been recorded. Desorption of the solid samples was enacted by the fourth harmonic output (266 nm) of a 5 ns Nd:YAG laser. Subsequent femtosecond post‐ionisation of the plume of neutral molecules was achieved using 800 nm laser pulses of 80 fs duration. Mass spectra have been recorded for desorption laser intensities from 2–6 × 10 9 W cm −2 with ionisation laser intensities between 2 × 10 14 and 6 × 10 15 W cm −2 . Femtosecond laser ionisation has been shown to be capable of generating precursor and characteristic high‐mass fragment ions for labile nitro‐aromatic molecules commonly used in high‐explosive materials. This feature is critical in the future development of femtosecond laser‐based analytical instruments that can be used for complex molecular identification and quantitative analysis of environmentally important labile molecules. Furthermore, a comparison of femtosecond post‐ionisation mass spectra with standard 70 eV electron impact data has revealed similarities in the spectra and hence the fragmentation processes. Copyright © 2001 John Wiley & Sons, Ltd.