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000012234 084__ $$2WoS$$aMeteorology & Atmospheric Sciences
000012234 1001_ $$0P:(DE-HGF)0$$aRöckmann, T.$$b0
000012234 245__ $$aIsotope effect in the formation of H2 from H2CO studied at the atmospheric simulation chamber SAPHIR
000012234 260__ $$aKatlenburg-Lindau$$bEGU$$c2010
000012234 300__ $$a5343-5357
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000012234 440_0 $$09601$$aAtmospheric Chemistry and Physics$$v10$$x1680-7316$$y12
000012234 500__ $$aWe thank Cornelia Richter for initial model studies to determine the most suitable conditions in the SAPHIR chamber. This work was funded by the Dutch science foundation NWO, project 816.01.001, H<INF>2</INF> budget.
000012234 520__ $$aFormaldehyde of known, near-natural isotopic composition was photolyzed in the SAPHIR atmosphere simulation chamber under ambient conditions. The isotopic composition of the product H-2 was used to determine the isotope effects in formaldehyde photolysis. The experiments are sensitive to the molecular photolysis channel, and the radical channel has only an indirect effect and cannot be effectively constrained. The molecular channel kinetic isotope effect KIEmol, the ratio of photolysis frequencies j(HCHO -> CO+H-2)/j(HCDO -> CO+HD) at surface pressure, is determined to be KIEmol = 1.63(-0.046)(+0.038) . This is similar to the kinetic isotope effect for the total removal of HCHO from a recent relative rate experiment (KIEtot= 1.58 +/- 0.03), which indicates that the KIEs in the molecular and radical photolysis channels at surface pressure (approximate to 100 kPa) may not be as different as described previously in the literature.
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000012234 7001_ $$0P:(DE-HGF)0$$aWalter, S.$$b1
000012234 7001_ $$0P:(DE-Juel1)2693$$aBohn, B.$$b2$$uFZJ
000012234 7001_ $$0P:(DE-Juel1)VDB65140$$aSpahn, H.$$b3$$uFZJ
000012234 7001_ $$0P:(DE-Juel1)16306$$aBrauers, T.$$b4$$uFZJ
000012234 7001_ $$0P:(DE-Juel1)5344$$aTillmann, R.$$b5$$uFZJ
000012234 7001_ $$0P:(DE-Juel1)VDB26256$$aSchlosser, E.$$b6$$uFZJ
000012234 7001_ $$0P:(DE-HGF)0$$aKoppmann, R.$$b7
000012234 7001_ $$0P:(DE-Juel1)16347$$aRohrer, F.$$b8$$uFZJ
000012234 773__ $$0PERI:(DE-600)2069847-1$$a10.5194/acp-10-5343-2010$$gVol. 10, p. 5343-5357$$p5343-5357$$q10<5343-5357$$tAtmospheric chemistry and physics$$v10$$x1680-7316$$y2010
000012234 8567_ $$uhttp://dx.doi.org/10.5194/acp-10-5343-2010
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