Dissociative photoionization cross sections of O2 from threshold to 120 Å

Samson, James A. R.; Rayborn, Grayson H.; Pareek, Prem N.

doi:10.1063/1.442735

Cited by 46 publications

(11 citation statements)

References 20 publications

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“… b References: 1, Anbar et al [1993]; 2, Anderson et al [1985]; 3, Arnold and Comes [1979]; 4, Badger et al [1965]; 5, Brock and Watson [1980]; 6, Fairchild et al [1978]; 7, Hippler et al [1990]; 8, Lee et al [1977]; 9, Nicolet [1984]; 10, Parisse et al [1996]; 11, Samson et al [1982]; 12, Sander et al [2003]; 13, Sandor et al [1997]; 14, Sparks et al [1980]; 15, Taherian and Slanger [1985]; 16, Turnipseed et al [1991]; 17, Wine and Ravishankara [1982]; 18, Yung et al [1988]. …”

Section: Atmospheric Modelsmentioning

confidence: 99%

Isotopic composition of stratospheric ozone

et al. 2006

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[1] We present a kinetic calculation for the isotopic composition of stratospheric ozone. The calculated enrichments of 49 O 3 and 50 O 3 are in agreement with atmospheric measurements made at midlatitudes. Integrating the kinetic fractionation processes in the formation and photolysis of ozone, we obtain enrichments of $7.5-10.5 and $7.5-12.5% (referenced to atmospheric O 2 ) for d O 3 and d50 O 3 , respectively, at altitudes between 20 and 35 km; the photolysis in the Hartley band of ozone is responsible for the observed altitude variation. The overall magnitude of the ozone enrichments ($10%) is large compared with that commonly known in atmospheric chemistry and geochemistry. The heavy oxygen atom in ozone is therefore useful as a tracer of chemical species and pathways that involve ozone or its derived products. For example, the mass anomalies of oxygen in two greenhouse gases, CO 2 and N 2 O, are likely the consequences of the transfer of heavy oxygen atoms from ozone.

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Section: Atmospheric Modelsmentioning

confidence: 99%

Isotopic composition of stratospheric ozone

et al. 2006

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“…1.3 × 10 −8 , 1.1 × 10 −8 Johnston et al (1984); Kley (1984); Nicolet (1984); Gibson et al 117 ≤ λ ≤ 178 nm (1983); Allen and Frederick (1982); Samson et al (1982Samson et al ( , 1977; Kirby et al (1979); Carver et al (1977); Lee et al (1977); Ogawa and Ogawa (1975); Ackerman (1971); Matsunaga and Watanabe (1967); Ditchburn and Young (1962) R247 OH hν → O + H 7.3 × 10 −8 , 3.7 × 10 −8 Nee and Lee (1984); ; 91 ≤ λ ≤ 193 nm R248 H 2 O hν → H + OH 5.3 × 10 −8 , 2.5 × 10 −8 Haddad and Samson (1986); Lee and Suto (1986); Pravilov and 61 ≤ λ ≤ 198 nm Shul'pyakov (1986); Slanger and Black (1982); Wu and Judge R249 hν → 2H + O 3.9 × 10 −9 , 6.0 × 10 −13 (1981); Stief et al (1975); Thompson et al (1963) Stark et al (1991); Samson and Haddad (1988); Letzelter et al 39 ≤ λ ≤ 112 nm (1987); Wright et al (1976) R252 CO 2 hν → CO + O 6.5 × 10 −11 , 6.2 × 10 −11 Lewis and Carver (1983); Hitchcock and Brion (1980); Okabe 63 ≤ λ ≤ 208 nm (1978); Slanger and Black (1978); Lawrence (1972a,b); R253 DeMore et al (1992,1990,1987,1985); Suto et al (1986); Okabe 238 ≤ λ ≤ 345 nm (1978); Glicker and Stief (1971); Mentall et al (1971); R256 hν → H 2 + CO 5.4 × 10 −7 , 5.1 × 10 −7 Gentieu and Me...…”

Section: Photochemical Model Descriptionmentioning

confidence: 99%

Photochemistry of Saturn's Atmosphere II. Effects of an Influx of External Oxygen

Moses

Lellouch

Bézard

et al. 2000

Icarus

149

223

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“…toionization [15][16][17][18] (OP) and by the dissociative charge-transfer (OCT) processes ll • 12 involving Ar + ep3/2 ) in the E c . m .…”

Section: Introductionmentioning

confidence: 99%

Absolute state-selected and state-to-state total cross sections for the Ar+(2P3/2,1/2)+CO2 reactions

Flesch

1992

The Journal of Chemical Physics

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Absolute stateselected and statetostate total cross sections for the Ar+(2 P 3/2,1/2)+CO reactions J. Chem. Phys. 95, 3381 (1991); 10.1063/1.460843Experimental and theoretical total stateselected and statetostate absolute cross sections. II. The Ar+(2 P 3/2,1/2)+H2 reaction J. Chem. Phys. 93, 4832 (1990); 10.1063/1.459671Experimental and theoretical total stateselected and statetostate absolute cross sections. I. The H+ 2(X,v')+Ar reaction Absolute stateselected and statetostate total cross sections for the reaction Ar+(2 P 3/2,1/2)+O2 Absolute statetostate total cross sections for the reactions N+ 2(X,v'=0-2) +Ar(1 S 0)→N2(X,v)+Ar+(2 P 3/2,1/2) Absolute spin-orbit state-selected total cross sections for the reactions, Ar + (2 P3/2.112) + CO 2 -+ CO 2 + + Ar [reaction (1)], CO + + 0 + Ar [reaction (2) ], o + + CO + Ar [reaction (3) ], C++ 20 + Ar [reaction (4)], ArC + + 20 [reaction (5)],ArO + + CO [reaction (6)], and ArCO + + 0 [reaction (7)] have been measured in the center-of-mass collision energy (E c . m . ) range of 0.26-131 e V. The ratio of the charge-transfer cross section due to Ar + e P I12 ) to that associated with Ar + e P3(2 ) varies in the range of 0.5-0.8. The appearance energies observed for CO + (E c . m . = 4.2 ± 0.5 eV), 0 + (E c . m . = 3.7 ± 0.5 eV), and C + (E c . m . = 12.6 ± 0.5 eV) are in agreement with the thermochemical thresholds for reactions (2), (3), and (4), respectively. The comparison of the absolute cross sections for CO + , 0 + , and C + from CO 2 by photoionization and by dissociative charge transfer [reactions (2)-(4)] is made. The kinetic-energy analysis of product cot, CO +,0 +, C +, ArO +, and ArC + suggests that reactions (2)-(7) proceed via a charge-transfer predissociation mechanism. This experiment, together with the previous studies of Ar+ ep3/2.112) + N2 (02'CO), supports the conclusion that product ions formed by dissociative photoionization are also produced by dissociative charge transfer. We find that the absolute cross sections for product ions formed in the dissociative charge-transfer processes [reactions (2 )-( 4)] are substantially greater than those formed in the dissociative photoionization of CO 2 , a finding consistent with the general observation that photo ionization cross sections are significantly smaller than charge-transfer cross sections. The relative cross sections for CO + ,0 + , and C + formed by reactions (2)-( 4) are also found to be different from those for photoionization of CO 2 ' This difference is attributed to the anisotropic interaction potential surface responsible for the Ar + ep3(2,1I2) + CO 2 reactions.162

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Dissociative photoionization cross sections of O2 from threshold to 120 Å

Cited by 46 publications

References 20 publications

Isotopic composition of stratospheric ozone

Isotopic composition of stratospheric ozone

Photochemistry of Saturn's Atmosphere II. Effects of an Influx of External Oxygen

Absolute state-selected and state-to-state total cross sections for the Ar+(2P3/2,1/2)+CO2 reactions

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