Using Laser Desorption/Ionization to Study Heteropoly Acids

The fragmentation of phosphomolybdic acid (PMA) is studied via laser desorption and ionization. It is found that during laser desorption and ionization, acid crystals tend to form cluster-type species of (MoO 3 ) n and HPO 3 ⋅(MoO 3 ) n . Species with the general formula HPO 2 ⋅(MoO 3 ) n and contai...

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Bibliographic Details
Published in:Russian Journal of Physical Chemistry A 2024-04, Vol.98 (4), p.742-750
Main Authors: Minenkova, I. V., Emel’yanov, A. M., Tarkhanova, I. G., Buryak, A. K.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Desorption
Dihydroxybenzoic acid
Ionization
Lasers
Mass spectra
Molecular ions
Parameter identification
Phosphomolybdic acid
Physical Chemistry
Physical Chemistry of Dispersed Systems and Surface Phenomena
Positive ions
Spectrometry
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Summary:The fragmentation of phosphomolybdic acid (PMA) is studied via laser desorption and ionization. It is found that during laser desorption and ionization, acid crystals tend to form cluster-type species of (MoO 3 ) n and HPO 3 ⋅(MoO 3 ) n . Species with the general formula HPO 2 ⋅(MoO 3 ) n and containing Mo 5+ and Mo 6+ are identified in the mode of positive ion detection. Hydrated H 3 PMo 12 O 40 ⋅MoO 3 ⋅4H 2 O molecular ions are detected in mass spectrometric studies of PMA solutions with a 2,5-dihydroxybenzoic acid matrix. Studying the effect parameters of laser desorption and ionization have on the information content of mass spectra show that peak intensity, laser power, and number of shots are generally in a symbate relationship. The peak intensity depends on the laser power more than on the number of shots.
ISSN:0036-0244
1531-863X
DOI:10.1134/S0036024424040186