Absorption spectra of tetra-alkyl ammonium salts

For matrix-assisted laser desorption/ionization (MALDI) mass spectra, undesirable ion contamination can occur due to the direct laser excitation of substrate materials (i.e., laser desorption/ionization (LDI)) if the samples do not completely cover the substrate surfaces. In this study, comparison is made of LDI processes on substrates of indium and silver, which easily emit their own ions upon laser irradiation, and conventional materials, stainless steel and gold. A simultaneous decrease of ion intensities with the number of laser pulses is observed as a common feature. By the application of an indium substrate to the MALDI mass spectrometry of alkali salts and alkylammonium salts mixed with matrices, 2,5-dihydroxybenzoic acid (DHB) or N-(4-methoxybenzylidene)-4-butylaniline (MBBA), the mixing of LDI processes can be detected by the presence of indium ions in the mass spectra. This method has also been found to be useful for investigating the intrinsic properties of the MALDI matrices: DHB samples show an increase in the abundance of fragment ions of matrix molecules and cesium ions with the number of laser pulses irradiating the same sample spot; MBBA samples reveal a decrease in the level of background noise with an increase in the thickness of the sample layer.

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On the absorption spectra and linkage of inorganic nitrates and sulphates in the vapour state

Haq

Samuel

1936

Proc. Indian Acad. Sci.

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Absorption spectra of tetra-alkyl ammonium salts

Cited by 3 publications

References 12 publications

Die Lichtabsorption von Tetraalkyl‐ammoniumsalzen

Die Lichtabsorption von Tetraalkyl‐ammoniumsalzen

Effects of substrate surfaces in matrix‐assisted laser desorption/ionization mass spectrometry

On the absorption spectra and linkage of inorganic nitrates and sulphates in the vapour state

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