A Simple Device for Lens-to-Sample Distance Adjustment in Laser-Induced Breakdown Spectroscopy (LIBS).
A simple device based on two commercial laser pointers is described to assist in the analysis of samples that present uneven surfaces and/or irregular shapes using laser-induced breakdown spectroscopy (LIBS). The device allows for easy positioning of the sample surface at a reproducible distance from the focusing lens that conveys the laser pulse to generate the micro-plasma in a LIBS system, with reproducibility better than ±0.2 mm. In this way, fluctuations in the fluence (J cm-2) are minimized and the LIBS analytical signals can be obtained with a better precision even when samples with irregular surfaces are probed.
1 Chemistry Institute, Department of Analytical Chemistry, UNICAMP, Campinas, SP, Brazil.
Juliana
J
Cortez
1 Chemistry Institute, Department of Analytical Chemistry, UNICAMP, Campinas, SP, Brazil.
Benedito B
BB
Farias Filho
1 Chemistry Institute, Department of Analytical Chemistry, UNICAMP, Campinas, SP, Brazil.
Laiane M
LM
Fontes
1 Chemistry Institute, Department of Analytical Chemistry, UNICAMP, Campinas, SP, Brazil.
Celio
C
Pasquini
1 Chemistry Institute, Department of Analytical Chemistry, UNICAMP, Campinas, SP, Brazil.
Ivo M
IM
Raimundo
2 Department of Chemical Engineering, Federal University of Pernambuco, Recife, PE, Brazil.
Maria Fernanda
MF
Pimentel
3 Department of Fundamental Chemistry, Federal University of Pernambuco, Recife, PE, Brazil.
Flávia
F
de Souza Lins Borba
LIBS; Laser-induced breakdown spectroscopy; lens-to-sample distance; repeatability; sample positioning