Quantum cascade laser-based photoacoustic spectroscopy of volatile chemicals: application to hexamethyldisilazane |
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| Authors: | Elia A Rizzi F Di Franco C Lugarà P M Scamarcio G |
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| Affiliation: | INFM Regional Laboratory LIT(3), Dipartimento Interateneo di Fisica Michelangelo Merlin Via Amendola 173, I-70126 Bari, Italy. angela.elia@fisica.uniba.it |
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| Abstract: | The use of photoacoustic spectroscopy and mid-infrared quantum-cascade lasers (QCLs) for the detection of hexamethyldisilazane (HMDS) is reported. A detection limit of 200 parts in 10(9) is found using a Fabry-Perot QCL operated at 8.4 microm in pulsed mode and a photoacoustic cell equipped with four electret microphones. The laser multimode spectrum matches the range of the N-H bending absorption band of HMDS. Further improvements to reach lower detection limits are discussed. |
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