Title: External Cavity Quantum Cascade Laser based Mid-IR Dispersion Spectroscopy for Qualitative and Quantitative Analysis of Liquid-Phase Samples
Language: English
Authors: Lindner, Stefan 
Hayden, Jakob 
Schwaighofer, Andreas  
Wolflehner, Tobias 
Kristament, Christian 
González-Cabrera, Maria 
Zlabinger, Stefan 
Lendl, Bernhard  
Category: Research Article
Issue Date: 2019
Journal: Applied Spectroscopy
ISSN: 1943-3530
Acquisition of classical absorption spectra of liquids in the mid-IR range with quantum cascade lasers (QCLs) is often limited in sensitivity by noise from the laser source. Alternatively, measure-ment of molecular dispersion (i.e. refractive index) spectra poses an experimental approach that is immune to intensity fluctuations and further offers a direct relationship between the recorded signal and the sample concentration. In this work, we present an EC-QCL based Mach-Zehnder interfer-ometer setup to determine dispersion spectra of liquid samples. We present two approaches for ac-quisition of refractive index spectra and compare the qualitative experimental results. Furthermore, the performance for quantitative analysis is evaluated. Finally, multivariate analysis of a spectrally complex mixture comprising three different sugars is performed. The obtained figures of merit by partial least squares (PLS) regression modelling compare well with standard absorption spectros-copy, demonstrating the potential of the introduced dispersion spectroscopic method for quantita-tive chemical analysis.
Keywords: Mid-infrared spectroscopy; dispersion spectroscopy; quantum cascade laser; liquid phase
DOI: 10.1177/0003702819892646
Library ID: AC15519814
URN: urn:nbn:at:at-ubtuw:3-7578
Organisation: E164 - Institut für Chemische Technologien und Analytik 
Publication Type: Article
Appears in Collections:Article

Files in this item:

Show full item record

Page view(s)

checked on Jun 16, 2021


checked on Jun 16, 2021

Google ScholarTM


Items in reposiTUm are protected by copyright, with all rights reserved, unless otherwise indicated.