Ozone is prepared by using silent electric discharges (12000 V, 400 Hz) at 77 K. In this case, we convert more than 96% of pure oxygen
into ozone. If we make the assumption that only O3 and O2 are present, the pressure of ozone at any instance is given by
PO3 = 2 [Pi - PT]
being the initial pressure of oxygen and PT
the total pressure, measured using an MKS Baratron gauge.
To verify that only O2
are present we used the fundamental bands of N218
O and HN18
when working on 18
O is difficult to quantify as residuals appear in the tank). In conclusion we have observed that
the sum of all impurities is lower than 0.3%.
Note that the temperature of all the room is controlled at ±0.5 °C.
More detailed information are in references :
A. Barbe, J.J. Plateaux, S. Bouazza, J.M. Flaud, and C. Camy-Peyret
Spectral properties of ozone in the 5 µm region.
J.Q.S.R.T. Vol. 48, No.5/6, pp.599-610 (1992).
A. Barbe, S. Bouazza, J.J. Plateaux, J.M. Flaud and C. Camy-Peyret
Line positions and intensities of the 2v3, v1 + v3 and
2v1 bands of 18O3.
J. Mol. Spectrosc. 150, pp. 255-261 (1991).
S. Mikhailenko, A. Barbe, Vl. G. Tyuterev, L. Regalia and J.J. Plateaux.
Line positions and intensities of the v1 + v2 + 3v3,
v2 + 4v3 and 3v1 + 2v2 bands of ozone.
J. Mol. Spectrosc. 180, pp.227-835 (1996).
M.R. de Backer-Barilly and A. Barbe
Absolute intensities of the 10 µm bands of 16O3.
J. Mol. Spectrosc. 205, pp.43-53 (2001).