Temperature dependence of the ozone absorption coefficient in the Hartley continuum

Astholz, D. C.; Croce, A.E.; Troe, J.

doi:10.1021/j100394a022

Cited by 56 publications

(19 citation statements)

References 4 publications

(4 reference statements)

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“…because the absorption is less sensitive to vibrationally excited ozone at this wavelength than at 254 nm[Astholz et al, 1982]. All absorption transients were results of single pulse experiments.Partial pressures in the cell of less than I bar were measured by a MKS 122AA-01000AB pressure transducer coupled to a MKS PDR-C-2C instrument with a resolution of 10 -3 mbar.…”

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confidence: 98%

Kinetic study of the formation of isotopically substituted ozone in argon

Sehested¹,

Nielsen²,

Egsgaard³

et al. 1998

J. Geophys. Res.

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Abstract. The kinetics of the formation of ozone was studied by using pulse radiolysis coupled with time-resolved UV absorption at 275 nm and at T -294.9 +_ 0.6 K. The rate constant for the formation of ozone 160160160 in argon was determined to be k3a = (3.38 +_ 0.04) x 10 -34 cm 6 molecule -2 s -1. The rate constants for the reactions and (k3c q-k3e)/(2k3a ) obtained by using CO2 as a third body. The parameter k3f/k3a (0.977 +_ 0.021) is lower than the value of k3f/k3a obtained by using CO2 as a third body and the value derived from the product studies. These different values of k3f may be partly due to changes in third body efficiency or due to resonance interactions between the excited ozone molecules and the third body. The absolute measurements reported here together with literature data suggest that the nature of the third body is an important factor in controlling the enhancements of the rate constants for ozone formation and that asymmetry of neither ozone nor dioxygen ensure a fast ozone formation rate.

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contrasting

confidence: 98%

Kinetic study of the formation of isotopically substituted ozone in argon

Sehested¹,

Nielsen²,

Egsgaard³

et al. 1998

J. Geophys. Res.

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“…1). This wavelength corresponds to the center of the Hartley absorption band [15]. The dependence of ozone concentration on flow rate of oxygen was investigated for constant voltage applied to the electrodes.…”

Section: Experimental Procedures and Resultsmentioning

confidence: 99%

Ozone Synthesis in an Electric Discharge between Ferroelectric Electrodes at Atmospheric Pressure

Opalińska

Szymański

Sabadil

et al. 1989

Contrib. Plasma Phys.

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This paper deals with studies of the ozone synthesis by means of an ac discharge (50 Hz) between two parallel ferroelectric plates under radial oxygen flow conditions a t atmospheric pressure. Bariumtitanate based ceramic with E e~ 6000 was used as ferroelectric material. An important feature of this kind of the discharge is the fact that the operating voltage is well one order of magnitude smaller than that of the silent discharge usually used for the 0, production. Examples of I -U characteristics are discussed. The absorption of light at 253.7 nm wavelength was used to determine [OJ within and downstream of the discharge as function of the 0, flow rate. These results have been examined in terms of it kinetic investigation of the 0, synthesis based on the socalled plug flow model including the particle balance equations of electrons, 0 atoms, 0, and 0, molecules, respectively. Thus, the measured decrease of [O,] with increasing flow rate can be explained by the increasing influence of the loss of 0, by convection on the particle balance of 0,.

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“…A fraction of this flow, which was controlled by MFC4 (Tylan FC-260), was introduced into the flow tube. The ozone concentration in the stream exiting the ozonolyzer that was not introduced in the flow tube was determined by UV-Visible absorption at l = 254 nm using UVIKON 930 Spectrophotometer fit with a glass cell with 10 cm long quartz windows (the cross section of ozone, s O 3 , is 1.129 Â 10 À17 cm 2 molecule À1 ), 32 and the ozone concentration in the flow tube was estimated considering the molar fraction of ozone. This estimation was checked using an UV Absorption Ozone Analyzer (SIR S-5014) and a calibration factor was applied to correct for possible wall losses in the sampling tubes.…”

Section: Methodsmentioning

confidence: 99%