Abstract
Laser desorption of organic compound ions from specially prepared surfaces is known as surface-assisted laser desorption/ionization (SALDI). In this work the properties of a SALDI ion emitter obtained by two-stage laser treatment of crystalline silicon surface have been investigated. The laser surface treatment leads to the formation of a layer with nanoscale objects—quantum dots (QDs) less than 10 nm in size, providing laser desorption of organic compound ions. A change in the desorbing laser wavelength from 351 to 263 nm at comparable laser-exposed spot sizes and fluences results in a sharp decrease in the formation efficiency for MH+ ions and appearance of ions M+ for the same analytes. The effect is apparently determined by the spectral properties of the quantum dots formed on the silicon surface under laser irradiation.
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This study was supported in part by the Russian Foundation for Basic Research, project no. 18-32-01018.
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Translated by Yu. Sin’kov
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Pento, A.V., Nikiforov, S.M. & Simanovsky, Y.O. Laser Desorption of Organic Compound Ions from a Silicon Surface Modified by Laser Irradiation. Phys. Wave Phen. 28, 213–221 (2020). https://doi.org/10.3103/S1541308X20030164
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DOI: https://doi.org/10.3103/S1541308X20030164