Coupling a Rapid-Scan FT-IR Spectrometer with Quantum Cascade Lasers within a Single Setup: An Easy Way to Reach Microsecond Time Resolution without Losing Spectral Information

Analytical Chemistry
Josefine SchneeMarco Daturi

Abstract

For the first time, a standard rapid-scan Fourier-transform infrared (FT-IR) spectrometer was coupled with quantum cascade lasers (QCLs) tunable within the 1876-905 cm-1 spectral range, within one single setup, by keeping one single sample compartment. The aim was to extend the time resolution of absorption measurements by several orders of magnitude thanks to the fast pulsed QCL technology without losing the spectral information provided by standard FT-IR spectroscopy, both probing the same sample. By slightly modifying the optical bench arrangement, the spectrometer now enables a fast and easy switch between the standard FT-IR mode, used for classical broadband scans from 6000 to 650 cm-1, and the new QCL-irradiation mode, used for ultrafast recording at specific wavenumbers (the two diagnostics have superimposed beam paths). So, one can study a sample (in condensed or gaseous state) during a physical or chemical transformation first as a whole in a broadband configuration and then immediately switch to the QCL mode to monitor a selected absorption feature (associated with an intermediate, a structural change, a diffusing substance, etc., for example) versus time. The QCL mode then drastically boosts the time resolution from ...Continue Reading

References

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May 23, 2009·Science·Frédéric Thibault-StarzykDavid A King
Nov 26, 2009·Journal of Veterinary Science·So Yeong LeeSang Woo Joo
Nov 3, 2010·Chemical Society Reviews·Alexandre VimontMarco Daturi
Jul 6, 2014·Nature Protocols·Matthew J BakerFrancis L Martin

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Citations

Dec 24, 2019·Applied Spectroscopy·Urszula SzczepaniakMarkus Geiser

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