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@ARTICLE{Rollins:5758,
author = {Rollins, A. W. and Kiendler-Scharr, A. and Fry, J. L. and
Brauers, T. and Brown, S. S. and Dorn, H.-P. and Dubé, W.
P. and Fuchs, H. and Mensah, A. and Mentel, T. F. and
Rohrer, F. and Tillmann, R. and Wegener, R. and Wooldridge,
P. J. and Cohen, R.C.},
title = {{I}soprene oxidation by nitrate radical: alkyl nitrate and
secondary organic aerosol yields},
journal = {Atmospheric chemistry and physics},
volume = {9},
issn = {1680-7316},
address = {Katlenburg-Lindau},
publisher = {EGU},
reportid = {PreJuSER-5758},
pages = {6685 - 6703},
year = {2009},
note = {The Berkeley authors were supported by NSF ATM-0639847 and
NSF ATM-0511829. The authors would like to thank the SAPHIR
NO<INF>3</INF> intercomparison campaign team for organizing
and administering the experiments in June 2007 at
Forschungszentrum Julich. This work was a joint activity of
the European Community Network of Excellence ACCENT, grant
no. GOCE CT-2004-505337 and the EUROCHAMP project.},
abstract = {Alkyl nitrates and secondary organic aerosol (SOA) produced
during the oxidation of isoprene by nitrate radicals has
been observed in the SAPHIR ( Simulation of Atmospheric
PHotochemistry In a large Reaction Chamber) chamber. A 16 h
dark experiment was conducted with temperatures at 289-301
K, and maximum concentrations of 11 ppb isoprene, 62.4 ppb
O-3 and 31.1 ppb NOX. We find the yield of nitrates is 70
+/- $8\%$ from the isoprene + NO3 reaction, and the yield
for secondary dinitrates produced in the reaction of primary
isoprene nitrates with NO3 is 40 +/- $20\%.$ We find an
effective rate constant for reaction of NO3 with the group
of first generation oxidation products to be 7 x 10(-14)
molecule(-1) cm(3) s(-1). At the low total organic aerosol
concentration in the chamber (max=0.52 mu g m(-3)) we
observed a mass yield (Delta SOA mass/Delta isoprene mass)
of $2\%$ for the entire 16 h experiment. However a
comparison of the timing of the observed SOA production to a
box model simulation of first and second generation
oxidation products shows that the yield from the first
generation products was $<0.7\%$ while the further oxidation
of the initial products leads to a yield of $14\%$ ( defined
as Delta SOA/Delta isoprene(2X) where Delta isoprene(2X) is
the mass of isoprene which reacted twice with NO3). The SOA
yield of $14\%$ is consistent with equilibrium partitioning
of highly functionalized C-5 products of isoprene
oxidation.},
keywords = {J (WoSType)},
cin = {ICG-2},
ddc = {550},
cid = {I:(DE-Juel1)VDB791},
pnm = {Atmosphäre und Klima},
pid = {G:(DE-Juel1)FUEK406},
shelfmark = {Meteorology $\&$ Atmospheric Sciences},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000270131400003},
url = {https://juser.fz-juelich.de/record/5758},
}