Journal ArticleDOI
Direct Determination of Carbon Dioxide in Aqueous Solution Using Mid-Infrared Quantum Cascade Lasers
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TLDR
A method for the direct determination of carbon dioxide in aqueous solutions using a room-temperature mid-infrared (MIR) quantum cascade laser at 2330 cm−1 is reported.Abstract:
A method for the direct determination of carbon dioxide in aqueous solutions using a room-temperature mid-infrared (MIR) quantum cascade laser at 2330 cm–1 is reported. The absorption values of different carbon dioxide concentrations were measured in a 119 μm CaF2 flow-through cell. An optical system made of parabolic mirrors was used to probe the flow cell and to focus the laser beam on the mercury cadmium telluride (MCT) detector. Aqueous carbon dioxide standards were prepared by feeding different mixtures of gaseous N2 and CO2 through wash bottles at controlled temperature. The concentration of the dissolved CO2 was calculated according to Henry's law, taking into account the temperature and the partial pressure of CO2. The carbon dioxide standards were connected via a selection valve to a peristaltic pump for subsequent, automated measurement in the flow-through cell. A calibration curve was obtained in the range of 0.338 to 1.350 g/L CO2 with a standard deviation of the method sxo equal to 19.4 mg/L CO2. The limit of detection was calculated as three times the baseline noise over time and was determined to be 39 mg/L.read more
Citations
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Comparison of mid-infrared and Raman spectroscopy in the quantitative analysis of serum.
Daniel Rohleder,Gerrit Kocherscheidt,K. Gerber,Wolfgang Kiefer,W. Köhler,Joachim Möcks,Wolfgang Petrich +6 more
TL;DR: Using the same sample set, comparable sample throughput, and identical mathematical quantification procedures Raman and mid-infrared spectroscopy of serum deliver similar accuracies for the quantification of the analytes under investigation, although vibrational spectroscopic-based quantification appears to be limited to accuracies in the 0.1 mmol/l range.
Journal ArticleDOI
Discrete frequency infrared microspectroscopy and imaging with a tunable quantum cascade laser
TL;DR: This work describes a DF-IR imaging microscope that uses an external cavity quantum cascade laser (QCL) as a source and demonstrates that the use of a tunable laser source represents a distinct advantage over broadband sources when using a small aperture (narrower than the wavelength of light) to perform high-quality point mapping.
Journal ArticleDOI
Infrared evanescent field sensing with quantum cascade lasers and planar silver halide waveguides.
TL;DR: The first midinfrared evanescent field absorption measurements with an InGaAs/AlInAs/InP distributed feedback (DFB) quantum cascade laser (QCL) light source operated at room temperature coupled to a free-standing, thin-film, planar, silver halide waveguide are demonstrated.
References
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Journal ArticleDOI
Sensitive absorption spectroscopy with a room-temperature distributed-feedback quantum-cascade laser
Khosrow Namjou,Simin Cai,Edward A. Whittaker,Jérôme Faist,Claire F. Gmachl,Federico Capasso,Deborah L. Sivco,A.Y. Cho +7 more
TL;DR: The first spectroscopic measurements to be made with a room-temperature quantum-cascade distributed-feedback laser using wavelength modulation spectroscopy detected N(2)O and CH(4) in the chemical fingerprint wavelength range near 8microm.
Journal ArticleDOI
Fast gas spectroscopy using pulsed quantum cascade lasers
TL;DR: In this paper, it was shown that using pulsed lasers and available fast detectors, lower residual sensitivity levels than in corresponding NIR systems can be achieved. But the stability is not sufficient for industrial applications.
Journal ArticleDOI
Mid-infrared quantum cascade lasers for flow injection analysis
TL;DR: A Fabry-Perot quantum cascade laser (QCL) was used as a powerful light source for mid infrared (MIR) detection in flow injection analysis and the signal-to-noise ratio could be improved by a factor of 50.
Journal ArticleDOI
Towards functional group-specific detection in high-performance liquid chromatography using mid-infrared quantum cascade lasers.
Andrea Edelmann,Caterina Ruzicka,Johannes Frank,Bernhard Lendl,Werner Schrenk,Erich Gornik,Gottfried Strasser +6 more
TL;DR: A distributed feedback quantum cascade laser was applied for the first time as a powerful light source for mid-infrared (MIR) detection in liquid chromatography, and group-specific detection could be achieved.
Journal ArticleDOI
Sensitive detection of methane and nitrous oxide isotopomers using a continuous wave quantum cascade laser
Gianluca Gagliardi,F. Tamassia,P. De Natale,C. Gmachl,Federico Capasso,Deborah L. Sivco,James N. Baillargeon,A. L. Hutchinson,A.Y. Cho +8 more
TL;DR: In this paper, a continuous wave quantum cascade laser (QCL) was used for wavelength modulation spectroscopy of methane (CH4) and nitrous oxide (N2O) stable isotopes.