Solvent effects on two-line atomic fluorescence of indium

We aim to investigate the potential of four different organic solvents, namely, acetone, ethanol, methanol, and isopropanol, and the organic-solvent-water mixtures as a seeding medium for the two-line atomic fluorescence technique. Water is used as the reference case. Indium, which has been previously shown to have suitable spectroscopic attributes, is chosen as the thermometry species in the present study. Acetone and methanol are shown to enhance the fluorescence signal intensity the most (approximately threefold to fivefold at stoichiometric conditions) when used. Acetone and methanol are shown to improve the fluorescence emission over the entire stoichiometric envelope of flame, most significantly in the rich combustion region, as well as a twofold enhancement in the signal-to-noise ratio.Qing N. Chan, Paul R. Medwell, Peter A. M. Kalt, Zeyad T. Alwahabi, Bassam B. Dally, and Graham J. Natha

FIELD EFFECTS IN MOLECULAR ION FORMATION BY THE THERMOSPRAY TECHNIQUE

Il semble que le champ électrique soit pour partie responsable de la formation des ions par la technique thermospray (TSP). Quelques phénomènes d'ionisation observés dans les spectres -TSP des saccharides et des sels d'ammonium diquaternaires sont rapportés et discutés. Seuls les signaux di-cationiques de ces spectres sont indicatifs de l'évaporation ionique de champ à partir de gouttelettes chargées.Field effects thought to be involved in the formation of ions by the thermospray (TSP) techniques are outlined. Some ionization phenomena observed in the TSP spectra of saccharides and diquaternary ammonium salts are reported and discussed. Only the dication signals in the spectra of the latter are indicative of field induced ion evaporation from charged droplets