{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,14]],"date-time":"2025-10-14T06:56:35Z","timestamp":1760424995858,"version":"build-2065373602"},"reference-count":23,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2010,3,11]],"date-time":"2010-03-11T00:00:00Z","timestamp":1268265600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>We report on the development of a microelectromechanical systems (MEMS)-scale photoacoustic sensor for the detection of trace gases. A mid-infrared quantum cascade laser (QCL) was used to determine detection limits for acetic acid, acetone, 1,4-dioxane, and vinyl acetate. The source was continuously tunable from 1015 cm-1 to 1240 cm-1, allowing for the collection of photoacoustic vibrational spectra for these gases. Exceptional agreement between the measured photoacoustic spectra and the infrared spectra for acetic acid, acetone, 1,4-dioxane, and vinyl acetate was observed. Partial least-squares (PLS) regression was used to develop an algorithm for classification of these compounds based solely on photoacoustic spectra.<\/jats:p>","DOI":"10.3390\/s100301986","type":"journal-article","created":{"date-parts":[[2010,3,14]],"date-time":"2010-03-14T13:26:04Z","timestamp":1268573164000},"page":"1986-2002","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":49,"title":["Quantum Cascade Laser-Based Photoacoustic Spectroscopy for Trace Vapor Detection and Molecular Discrimination"],"prefix":"10.3390","volume":"10","author":[{"given":"Ellen","family":"Holthoff","sequence":"first","affiliation":[{"name":"United States Army Research Laboratory, RDRL-SEE-O, 2800 Powder Mill Road, Adelphi, MD 20783, USA"}]},{"given":"John","family":"Bender","sequence":"additional","affiliation":[{"name":"United States Army Research Laboratory, RDRL-SEE-O, 2800 Powder Mill Road, Adelphi, MD 20783, USA"}]},{"given":"Paul","family":"Pellegrino","sequence":"additional","affiliation":[{"name":"United States Army Research Laboratory, RDRL-SEE-O, 2800 Powder Mill Road, Adelphi, MD 20783, USA"}]},{"given":"Almon","family":"Fisher","sequence":"additional","affiliation":[{"name":"Infotonics Technology Center, 5450 Campus Drive, Canandaigua, NY 14424, USA"}]}],"member":"1968","published-online":{"date-parts":[[2010,3,11]]},"reference":[{"key":"ref_1","first-page":"895","article-title":"Mobile laser spectrometer with novel resonant multipass photoacoustic cell for trace-gas sensing","volume":"70","author":"Sigrist","year":"2001","journal-title":"Appl. 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[5th ed]."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/10\/3\/1986\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T22:01:43Z","timestamp":1760220103000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/10\/3\/1986"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2010,3,11]]},"references-count":23,"journal-issue":{"issue":"3","published-online":{"date-parts":[[2010,3]]}},"alternative-id":["s100301986"],"URL":"https:\/\/doi.org\/10.3390\/s100301986","relation":{},"ISSN":["1424-8220"],"issn-type":[{"type":"electronic","value":"1424-8220"}],"subject":[],"published":{"date-parts":[[2010,3,11]]}}}