title: Cavity enhanced absorption spectroscopy of multiple trace gas species using a supercontinuum radiation source.
abstract: Supercontinuum radiation sources are attractive for spectroscopic applications owing to their broad wavelength coverage, which enables spectral signatures of multiple species to be detected simultaneously. Here we report the first use of a supercontinuum radiation source for broadband trace gas detection using a cavity enhanced absorption technique. Spectra were recorded at bandwidths of up to 100 nm, encompassing multiple absorption bands of H(2)O, O(2) and O(2)-O(2). The same instrument was also used to make quantitative measurements of NO(2) and NO(3). For NO(3) a detection limit of 3 parts-per-trillion in 2 s was achieved, which corresponds to an effective 3sigma sensitivity of 2.4 x 10(-9) cm(-1)Hz(-1/2). Our results demonstrate that a conceptually simple and robust instrument is capable of highly sensitive broadband absorption measurements.
authors.affiliation: Department of Chemistry, University of Cambridge, Lensfield Road,Cambridge CB2 1EW, UK.
authors.forename: J M
authors.initials: JM
authors.lastname: Langridge
authors.forename: T
authors.initials: T
authors.lastname: Laurila
authors.forename: R S
authors.initials: RS
authors.lastname: Watt
authors.forename: R L
authors.initials: RL
authors.lastname: Jones
authors.forename: C F
authors.initials: CF
authors.lastname: Kaminski
authors.forename: J
authors.initials: J
authors.lastname: Hult
mesh_terms: D000393:Air Pollutants / Q000032:analysis; D001272:Atmosphere / Q000032:analysis; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D005740:Gases; D009585:Nitrogen Dioxide / Q000032:analysis; D009589:Nitrogen Oxides / Q000032:analysis; D010100:Oxygen / Q000737:chemistry; D010825:Physics / Q000379:methods; D011827:Radiation; D013053:Spectrophotometry / Q000295:instrumentation* / Q000379:methods*; D013055:Spectrophotometry, Infrared / Q000295:instrumentation / Q000379:methods; D014867:Water / Q000737:chemistry
chemical_list: D000393:Air Pollutants; D005740:Gases; D009589:Nitrogen Oxides; D014867:Water; C031701:nitrogen trioxide; D009585:Nitrogen Dioxide; D010100:Oxygen