Ionization of organic molecules with metal ions formed in the laser plasma

A laser plasma ion source was used to ionize volatile organic compounds in a gas sample. The plasma was generated on a metal target in the intermediate vacuum region of ~0.3 Torr using a pulsed Nd:YAG laser with a wavelength of 1 μm. The resulting ions mass spectra were acquired using orthogonal tim...

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Bibliographic Details
Published in:Journal of mass spectrometry. 2021-05, Vol.56 (5), p.e4723-n/a
Main Authors: Filatov, Vasily V., Nikiforov, Sergey M., Zelenov, Vladislav V., Pento, Andrey V., Bukharina, Aygul B., Sulimenkov, Ilia V., Brusov, Vladimir S., Yu, Jiajun, Kozlovskiy, Viacheslav I.
Format: Article
Language:English
Subjects:
complex
ionization
octane
rate constant
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Summary:A laser plasma ion source was used to ionize volatile organic compounds in a gas sample. The plasma was generated on a metal target in the intermediate vacuum region of ~0.3 Torr using a pulsed Nd:YAG laser with a wavelength of 1 μm. The resulting ions mass spectra were acquired using orthogonal time‐of‐flight mass spectrometer (O‐TOF MS). When using a copper target, the ions formed are simple complexes (CuM+) of copper ions with organic molecules. The possibility of online identification of trace amounts of alkanes in nitrogen and air, with a detection limit of ~10 ppb, was demonstrated. The ionization efficiency of volatile organic compounds through the formation of clusters with metal ions is 10−4 in terms of the quasimolecular complex ions. The rate constants of ion‐molecular reactions of copper ions with octane and water molecules in nitrogen and air are estimated.
ISSN:1076-5174
1096-9888
DOI:10.1002/jms.4723