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Naslov:A multi-thermal-lens approach to evaluation of multi-pass probe beam configuration in thermal lens spectrometry
Avtorji:ID Cabrera, Humberto, ICTP-Trieste, Italy (Avtor)
ID Goljat, Leja, UNG (Avtor)
ID Korte, Dorota, UNG (Avtor)
ID Marin, Ernesto, IPN-Mexico City, Mexico (Avtor)
ID Franko, Mladen, UNG (Avtor)
Datoteke: Gradivo nima datotek, ki so prostodostopne za javnost. Gradivo je morda fizično dosegljivo v knjižnici fakultete, zalogo lahko preverite v COBISS-u. Povezava se odpre v novem oknu
Jezik:Angleški jezik
Vrsta gradiva:Delo ni kategorizirano
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UNG - Univerza v Novi Gorici
Opis: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.
Ključne besede:Thermal lens spectrometry, Photothermal detection, Trace determination, Chemical sensor
Verzija publikacije:Recenzirani rokopis
Št. strani:9
Številčenje:xxx
PID:20.500.12556/RUNG-4919-a6b11a1a-a026-4281-8d44-e3b4558510f3 Novo okno
COBISS.SI-ID:5499131 Novo okno
DOI:https://doi.org/10.1016/j.aca.2019.12.009 Novo okno
NUK URN:URN:SI:UNG:REP:1EBGFAQJ
Datum objave v RUNG:10.12.2019
Število ogledov:3381
Število prenosov:0
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
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Gradivo je del revije

Naslov:Analytica Chimica Acta
Skrajšan naslov:Anal. Chim. Acta
Založnik:Elsevier
ISSN:‎0003-2670

Licence

Licenca:CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
Opis:Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.
Začetek licenciranja:10.12.2019

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