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Title:A multi-thermal-lens approach to evaluation of multi-pass probe beam configuration in thermal lens spectrometry
Authors:ID Cabrera, Humberto, ICTP-Trieste, Italy (Author)
ID Goljat, Leja, UNG (Author)
ID Korte, Dorota, UNG (Author)
ID Marin, Ernesto, IPN-Mexico City, Mexico (Author)
ID Franko, Mladen, UNG (Author)
Files: This document has no files that are freely available to the public. This document may have a physical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Language:English
Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:In this work, a recently proposed thermal lens instrument based on multi-pass probe beam concept is investigated and described as a multi-thermal-lens equivalent system. A simulation of the photothermal lens signal formation in a multi-thermal-lens equivalent configuration of the system is performed and validated by comparing the experimental signals of single, dual and ten-pass configurations to theoretically calculated values. The theoretically predicted enhancement of the signal is 9 to 10-fold for a weak thermal lens when comparing the ten-pass configuration with the conventional single-pass thermal lens system. Experimentally achieved signal enhancement in the ten-pass system is 8.3 for pure ethanol sample and between 8 and 9 for solutions with different concentrations of the Fe(II) - 1,10-Phenanthroline complex. Additionally, a value of 9.1 was calculated as the ratio of the slopes of the calibration lines obtained using the ten-pass and single-pass configurations. The achieved limit of detection for determination of Fe(II), in the ten-pass configuration, was 0.4 µgL-1, with a relative standard deviation around 4.5%, which compares favorably with previously reported results for TLS determination of Fe(II) in thin samples using low excitation power. For the multi-pass configuration the linear range of measurement is reduced when compared to the single-pass configuration. This is explained by the theoretical analysis of the photothermal signal under multi-pass condition, which shows the important contribution of the nonlinear term in the theoretical expression for the photothermal signal. The ten-pass configuration, which is presented and validated experimentally for the first time, offers important signal enhancement needed in recently developed TLS instruments with tunable, low power excitation sources.
Keywords:Thermal lens spectrometry, Photothermal detection, Trace determination, Chemical sensor
Publication version:Author Accepted Manuscript
Number of pages:9
Numbering:xxx
PID:20.500.12556/RUNG-4919-a6b11a1a-a026-4281-8d44-e3b4558510f3 New window
COBISS.SI-ID:5499131 New window
DOI:https://doi.org/10.1016/j.aca.2019.12.009 New window
NUK URN:URN:SI:UNG:REP:1EBGFAQJ
Publication date in RUNG:10.12.2019
Views:4638
Downloads:0
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CABRERA, Humberto, GOLJAT, Leja, KORTE, Dorota, MARIN, Ernesto and FRANKO, Mladen, no date, A multi-thermal-lens approach to evaluation of multi-pass probe beam configuration in thermal lens spectrometry. Analytica Chimica Acta [online]. Vol. xxx. [Accessed 2 April 2025]. DOI https://doi.org/10.1016/j.aca.2019.12.009. Retrieved from: https://repozitorij.ung.si/IzpisGradiva.php?lang=eng&id=4919
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Record is a part of a journal

Title:Analytica Chimica Acta
Shortened title:Anal. Chim. Acta
Publisher:Elsevier
ISSN:‎0003-2670

Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:10.12.2019

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