Experimental determination of HONO mass accommodation coefficients using two different techniques

Evaluated kinetic and photochemical data for atmospheric chemistry: Volume I - gas phase reactions of O<sub>x</sub>, HO<sub>x</sub>, NO<sub>x</sub> and SO<sub>x</sub> species

“…The results of Wang and Zhang (2000), Stutz et al (2000) and The studies of Wang and Zhang (2000), Stutz et al (2000) and are also in agreement with the earlier studies of Stockwell and Calvert (1978), Vasudev (1990) and Bongartz et al (1991Bongartz et al ( , 1994, which were the basis of the preferred values for the absorption cross-section given in our previous evaluation, IUPAC (1997), which are therefore unchanged. The preferred values of the cross-sections tabulated for the 300-395 nm range are obtained from the data of Bongartz et al (1991Bongartz et al ( , 1994. In their later work (Bongartz et al, 1994), cross-sections were measured under better controlled conditions than in their earlier study (Bongartz et al, 1991) and it was shown that their earlier data were consistently too high by, on average, 14.5%.…”

“…In their later work (Bongartz et al, 1994), cross-sections were measured under better controlled conditions than in their earlier study (Bongartz et al, 1991) and it was shown that their earlier data were consistently too high by, on average, 14.5%. The preferred values have been obtained, therefore, by averaging the data from Bongartz et al (1991) over 5 nm intervals centred on the wavelength specified in the Table and reducing these values by 14.5% as directed in Bongartz et al (1994).…”

“…Since our previous evaluation, IUPAC (1997), Wang and Zhang (2000) have measured the absorption cross-sections at 352.2 nm, 354.2 nm and 357.0 nm and there have been three other new determinations by Stutz et al (2000), and Brust et al (2000) of the absorption cross-sections over a range of wavelengths in the 300-400 nm range. The results of Wang and Zhang (2000), Stutz et al (2000) and The studies of Wang and Zhang (2000), Stutz et al (2000) and are also in agreement with the earlier studies of Stockwell and Calvert (1978), Vasudev (1990) and Bongartz et al (1991Bongartz et al ( , 1994, which were the basis of the preferred values for the absorption cross-section given in our previous evaluation, IUPAC (1997), which are therefore unchanged.…”

Measurements of the HONO photodissociation constant

“…The quantum yield, <Pphotolysis for the photodissociation of HONO was taken to be unity (Demore et al, 1997) and the absorption cross-section data was taken from Bongartz et al (1991Bongartz et al ( , 1994. Table 2 contains a list of the user-selected parameters employed in the ACD TUV version 4.1 model calculations.…”

“…The cross sections are always related to the sum ofthe trans-and cis-HONO concentration due to the large degree of uncertainty on the equilibrium constant (Becker et al, 1995), K = Ptrans1pcis = 3.25 ± 0.30 at 277 K (Bongartz et al, 1991). Several HONO absorption cross section data exist in the literature (Johnston and Graham, 1974;Derwent, 1976, 1977;Stockwell and Calvert, 1978;Perner and Platt, 1979;Vasudev, 1990;Bongartz et al, 1991Bongartz et al, , 1994Febo et al, 1995;Pagsberg et al, 1997;Brust et al, 2000;Stutz et al, 2000), as compared in Table 3. The published data differs significantly, with spectral resolutions in the range of <0.1-1 nm, and various methods of HONO production (refer to Table 3).…”