| Naslov: | A multi-thermal-lens approach to evaluation of multi-pass probe beam configuration in thermal lens spectrometry |
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| 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) |
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| Datoteke: |
Gradivo nima datotek, ki so prostodostopne za javnost. Gradivo je morda fizično dosegljivo v knjižnici fakultete, zalogo lahko preverite v COBISS-u.  |
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| Jezik: | Angleški jezik |
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| Vrsta gradiva: | Delo ni kategorizirano |
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| Tipologija: | 1.01 - Izvirni znanstveni članek |
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| Organizacija: | UNG - Univerza v Novi Gorici
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| 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. |
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| Ključne besede: | Thermal lens spectrometry, Photothermal detection, Trace determination, Chemical sensor |
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| Verzija publikacije: | Recenzirani rokopis |
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| Št. strani: | 9 |
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| Številčenje: | xxx |
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| PID: | 20.500.12556/RUNG-4919-a6b11a1a-a026-4281-8d44-e3b4558510f3 |
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| COBISS.SI-ID: | 5499131 |
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| DOI: | https://doi.org/10.1016/j.aca.2019.12.009 |
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| NUK URN: | URN:SI:UNG:REP:1EBGFAQJ |
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| Datum objave v RUNG: | 10.12.2019 |
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| Število ogledov: | 3181 |
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| Število prenosov: | 0 |
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| Metapodatki: |     |
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