Preparation and accurate measurement of pure ozone

Abstract

Preparation of high purity ozone as well as precise and accurate measurement of its pressure are metrological requirements that are difficult to meet due to ozone decomposition occurring in pressure sensors. The most stable and precise transducer heads are heated and, therefore, prone to accelerated ozone decomposition, limiting measurement accuracy and compromising purity. Here, we describe a vacuum system and a method for ozone production, suitable to accurately determine the pressure of pure ozone by avoiding the problem of decomposition. We use an inert gas in a particularly designed buffer volume and can thus achieve high measurement accuracy and negligible degradation of ozone with purities of 99.8% or better. The high degree of purity is ensured by comprehensive compositional analyses of ozone samples. The method may also be applied to other reactive gases.

Accurate measurements of ozone absorption cross-sections in the Hartley band

“…In addition, leaks within the system and reaction of ozone with contaminated surfaces could potentially lead to other trace contaminants being present. A comprehensive study of possible contaminants in ozone samples generated from oxygen by discharges followed by cryogenic distillation was performed by Janssen et al (2011). As expected, oxygen was found to be the major impurity with a mole fraction of 1 mmol mol −1 , followed by nitrous oxide at 0.3 mmol mol −1 .…”

“…1, consists of four major parts: a silent discharge cryogenic ozone generator (CRYO), an absorption cell (AC), a pressure gauge (CDG) and a quadrupole mass spectrometer (RGA). The discharge cryogenic ozone generator is where ozone was generated from an electric discharge in pure oxygen (Linde, grade 6.0), using a method similar to that described by Janssen et al (2011). The absorption cell is made of quartz and is where gaseous ozone at room temperature was introduced to allow absorption measurements to be performed with an intensity-stabilized UV laser beam.…”

Fundamental Review to Ozone Gas Sensing Using Optical Fibre Sensors

“…It is comprised of optical sensor mechanism [5], advantages of optical sensors [6,7], optical sensor classification [8], optical gas cells classification [9], Beer-Lambert law [10] and ozone gas and its research challenges [11][12][13]. Ozone is a trace gas in the atmosphere [14] and is discovered in 1839 [15]. Ozone is a useful gas, but it is a threat to human life [16][17][18][19].…”

A new photometric ozone reference in the Huggins bands: the absolute ozone absorption cross section at the 325 nm HeCd laser wavelength

“…Ozone is produced from high purity oxygen gas (99.9995 %, Air Liquide, France) in a dedicated vacuum system that has been described elsewhere (Janssen et al, 2011). Here we briefly describe some key points (see Fig.…”

“…In order to improve the stability during the pressure reading, a buffer gas technique has been employed (Janssen et al, 2011).…”