High sensitivity point monitoring of ozone, and high resolution spectroscopy of the ν_3 band of ozone using a tunable semiconductor diode laser

Abstract

Accurate measurements of the wavenumbers of more than 100 lines in the nu(3) band of ozone have been made using a tunable semiconductor diode laser and a temperature-stabilized germanium etalon. The accuracy for the line centers is estimated to be within 3-10 MHz and compares well with the accuracy attained using more complicated heterodyne techniques. The relevance of these results to ozone monitoring instruments based on CO(2) lasers is discussed. The tunability of the diode laser is also exploited to monitor ambient concentrations of ozone in the presence of interfering molecular species. A detection sensitivity of ~0.5 ppb of ozone is demonstrated.

Observation of the Zeeman Effect of Ozone by Doppler Free Laser Spectroscopy

“…In [3] and [11] an assignment of this absorption is given with (001) 16 8 9 -(000) 16 8 , 8 . Using the molecular constants of Barbe et al [4] and the components g aa , gt, b and g cc of the ^-factor given by Mack et al [5] we calculate the gj factors of both levels to be gj = -0.8209 yielding a splitting between o+ and cr_ transitions of 25.7 MHz at 20530 G. This is in good agreement with our observed splitting.…”

Ozone detection based on an nitrogen oxide photoacoustic spectroscopy system and chemical reaction

“…Then, based on the absorption characteristics and absorption cross-section of NO2 at a specific wavelength (e.g., 254 nm), its concentration is obtained by the photoacoustic effect and then the ozone concentration is calculated. For O3 detection, photoacoustic spectroscopy (PAS) [16][17][18] and related cavity techniques such as cavity ring-down spectroscopy (CRDS) [19][20][21], cavity-enhanced absorption spectroscopy (CEAS) [22,23], cavity attenuated phase shift spectroscopy (CAPS) [24] and tunable diode laser absorption spectroscopy (TDLAS) [25] have strong anti-interference ability and been applied well. The authors describe a dualchannel PAS system based on the chemical conversion NO to NO2 to measure O3 concentration.…”

Ab Initio Insight into Mechanisms of Ozone Interaction with a Surface of Dehydrated Nanocrystalline TiO2

“…For this reason, studies on ozone’s physicochemical reaction pathways are of great importance, which is readily demonstrated by a plethora of scientific publications including spectroscopic reports. Ozone was studied in a gas phase − isolated in cryomatrices, , in cryosolutions, − and in an adsorbed state, − to name a few. With respect to reduction of the environmental impact of ozone, its adsorption is of particular interest.…”