A hybrid FTIR/QCL sensing system for gas-phase kinetics using a long-path gas cell

Megan K. Dunlap; Kendall D. Hughey; Russell G. Tonkyn; Warren W. Harper; Tanya L. Myers; Timothy J. Johnson

doi:10.1117/12.2619856

31 May 2022 A hybrid FTIR/QCL sensing system for gas-phase kinetics using a long-path gas cell

Megan K. Dunlap, Kendall D. Hughey, Russell G. Tonkyn, Warren W. Harper, Tanya L. Myers, Timothy J. Johnson

Proceedings Volume 12098, Dimensional Optical Metrology and Inspection for Practical Applications XI; 120980F (2022) https://doi.org/10.1117/12.2619856
Event: SPIE Defense + Commercial Sensing, 2022, Orlando, Florida, United States

Abstract

A hybrid Fourier transform infrared (FTIR) / quantum cascade laser (QCL) spectrometer is introduced for the analysis of gas-phase chemical kinetics, including the study of alkyl halide photolysis reactions. The FTIR provides broadband spectral survey information and the QCL laser system provides improved detection limits and acquisition speeds, albeit over limited wavelength domains. A kinetic model for the photolysis of methyl iodide is introduced which suggests that both the steady state products, such as methanol, and transient intermediates may be monitored using the hybrid setup. Preliminary results use an external cavity QCL to rapidly measure the spectrum of methanol from 2200-1960 cm-1 in ~2 seconds, which is sufficiently fast to capture the chemical dynamics predicted by the model to occur during the first several seconds of photolysis.

Conference Presentation

Citation Download Citation

Megan K. Dunlap, Kendall D. Hughey, Russell G. Tonkyn, Warren W. Harper, Tanya L. Myers, and Timothy J. Johnson "A hybrid FTIR/QCL sensing system for gas-phase kinetics using a long-path gas cell", Proc. SPIE 12098, Dimensional Optical Metrology and Inspection for Practical Applications XI, 120980F (31 May 2022); https://doi.org/10.1117/12.2619856

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available