Gas phase chemical equilibrium in dinitrogen trioxide and dinitrogen tetroxide

The NO2 absorption spectrum. III: The 200?300 nm region at ambient temperature

“…and PT = P~02 + PN204, it can be shown that for low pressures at ambient temperature, the relative error on the partial pressure PN02 is equivalent to that on the total pressure PT, even with a relative error AK/K = 10% (this value is higher than the actual error obtained in taking the limiting values derived from the formulas of Vosper (1970) and Chao et al (1974) at 293 K: K = 909 x 10 -4 atm and 976 x 10 -4 atm, respectively). Using Equation (3) When the N204 cross-section is small and when the pressure is low, the N204 contribution can be neglected in Equation (3) and the trmeas value is a good estimate for oSO z Coquart et al, 1995).…”

“…Using Equation (3) When the N204 cross-section is small and when the pressure is low, the N204 contribution can be neglected in Equation (3) and the trmeas value is a good estimate for oSO z Coquart et al, 1995). In this work, Crmeas crosssections have been determined in the same way (with the K value derived from the formula of Chao et al (1974)) since the experimental conditions (60.7 m pathlength, pressures lower than 0.1 Ton') are similar to those used in the experiments of papers I and II. The relative accuracy on the 'measured' cross-sections results from the cumulative errors indicated in Table I and does not exceed 3%.…”

“…The values of Johnston and Graham (1974) according to Bass et al (1976). The calculation was made at 5 nm intervals with the pressure values indicated in Table I and the K value derived from the formula of Chao et al (1974) at 293 K. The resulting values (given in Table II) may be considered as overestimation percentage since the true crNO 2 are lower than the O'meas values (Equation (5)). Table II shows that the error is generally lower than 1% except below 205 nm and for the region between 245 and 275 nm where the absorption of NO2 is very weak and where it was necessary to use higher pressures.…”

High‐resolution Fourier transform measurement of the NO2 visible and near‐infrared absorption cross sections: Temperature and pressure effects

“…Values of K P at 294 and 240 K were calculated using the polynomial expansion of Log 10 K P derived by Hurtmans et al [1993] from experimental values of K P ( K P = 104 and 0.58 hPa, respectively, at 294 and 240 K). The value of K P at 220 K was calculated using the formula given by Chao et al [1974] ( K P = 0.042 hPa).…”

Oxidation of cellulose in pressurized carbon dioxide

“…For example, Reamer and Sage [8] have done density measurements in the liquid-vapour coexistence region. Values of equilibrium constants in the gas phase as a function of temperature can be found in works of Verhoek and Daniels [9] or Chao et al [10]. James and Marshall [11] have determined equilibrium data for the liquid mixture and Redmond and Wayland [12] have been interested in equilibrium constant data for the nitrogen dioxide dissolved in organic solvents.…”