Comparison of different substrates for laser-induced electron transfer desorption/ionization of metal complexes

19th International Summer School on Vacuum, Electron and Ion Technologies

Grechnikov, A.A.^1 ; Georgieva, V.B.^2 ; Donkov, N.^3 ; Borodkov, A.S.^1 ; Pento, A.V.^4 ; Raicheva, Z.G.^2 ; Yordanov, Tc A^2

Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 19 Kosygin str., Moscow

119991, Russia^1

Georgi Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee, Sofia

1784, Bulgaria^2

Emil Djakov Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee, Sofia

1784, Bulgaria^3

Energomashtekhnika Ltd, 123 Vernadskogo pr., bl. 2, Moscow

119571, Russia^4

关键词: 8-Mercaptoquinoline;    Desorption/ionization;    Different substrates;    Metal coordination;    One-dimensional heat;    Surface temperatures;    Three orders of magnitude;    Titanium dioxides (TiO2);   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/700/1/012025/pdf
DOI  :  10.1088/1742-6596/700/1/012025

来源: IOP

【 摘 要 】

Four different substrates, namely, graphite, tungsten, amorphous silicon (α-Si) and titanium dioxide (TiO2) films, were compared in view of the laser-induced electron transfer desorption/ionization (LETDI) of metal coordination complexes. A rhenium complex with 8-mercaptoquinoline, a copper complex with diphenylthiocarbazone and chlorophyll A were studied as the test analytes. The dependencies of the ion yield and the surface temperature on the incident radiation fluence were investigated experimentally and theoretically. The temperature was estimated using the numerical solution of a one-dimensional heat conduction problem with a heat source distributed in time and space. It was found that at the same temperature, the ion yield from the different substrates varies in the range of three orders of magnitude. The direct comparison of all studied substrates revealed that LETDI from the TiO2and α-Si films offer a better choice for producing molecular ions of metal coordination complexes.