Two-photon absorption laser-induced fluorescence and "conventional" laser-induced fluorescence as tools to understand processes in the miniature diffusion flame hydride atomizer

0505807 - ÚIACH 2020 MX eng A - Abstract
Dědina, Jiří - Kratzer, Jan - Štádlerová, Barbora - Musil, Stanislav - Svoboda, Milan - Obrusník, I. - Voráč, J. - Mrkvičková, M. - Dvořák, P.
Two-photon absorption laser-induced fluorescence and "conventional" laser-induced fluorescence as tools to understand processes in the miniature diffusion flame hydride atomizer.
Colloquium Spectroscopicum Internationale XLI & I Latin American Meeting on LIBS. Book of Abstracts. 2019. KL.At.3.
[Colloquium Spectroscopicum Internationale /XLI./ & Latin American Meeting on LIBS /I./ CSI XLI. 09.06.2019-14.06.2019, Mexico City]
R&D Projects: GA ČR GA17-04329S
Institutional support: RVO:68081715
Keywords : hydride generation * two-photon absorption laser-induced fluorescence * diffusion flame * temperature
OECD category: Analytical chemistry

The aim of the present work was to quantify the distributions of all the three fundamental parameters (H radicals, temperature and analyte free atoms) in MDF atomizer under relevant experimental conditions. H radical distribution determined by two photon absorption laser induced fluorescence (TALIF). TALIF
was also employed to derive temperature from the Gauss broadening of two photon absorption Lβ line. Laser induced fluorescence (LIF) of OH radicals and
Rayleigh scattering of the laser beam were tested as additional approaches to find temperature distribution. LIF was used to derive spatial maps of absolute
concentrations of analyte free atoms. Pb was employed as an analyte for the preliminary experiments (see the figure for an illustration: x coordinate is the radial
distance from the tube axis, y is the vertical distance from the tube top). The Pb atom concentration resulting from LIF measurements was reasonably close to that
estimated from analyte supply from hydride generator. The quantification of the distributions of all the three fundamental parameters
together with a numerical model of the gas dynamics and heat transfer within the atomizer observation volume yield a complete information required for
optimization of MDF atomizer. Outlooks of this research to further investigation of other hydride atomizers will be outlined and emerging possibilities of absolute analysis will be discussed.
Permanent Link: http://hdl.handle.net/11104/0297187