Quantum cascade laser-based photoacoustic spectroscopy of volatile chemicals: application to hexamethyldisilazane.
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.
Elia
A
A
INFM Regional Laboratory LIT(3), Dipartimento Interateneo di Fisica Michelangelo Merlin Via Amendola 173, I-70126 Bari, Italy. angela.elia@fisica.uniba.it
Rizzi
F
F
Di Franco
C
C
Lugarà
P M
PM
Scamarcio
G
G
D007834:Lasers; D017646:Organosilicon Compounds / Q000737:chemistry*; D010783:Photometry; D011789:Quantum Theory; D017550:Spectroscopy, Fourier Transform Infrared; D014835:Volatilization
D017646:Organosilicon Compounds; C024548:hexamethylsilazane