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@ARTICLE{Hantschke:902291,
author = {Hantschke, Luisa and Novelli, Anna and Bohn, Birger and
Cho, Changmin and Reimer, David and Rohrer, Franz and
Tillmann, Ralf and Glowania, Marvin and Hofzumahaus, Andreas
and Kiendler-Scharr, Astrid and Wahner, Andreas and Fuchs,
Hendrik},
title = {{A}tmospheric photooxidation and ozonolysis of
$Δ\<sup\>3\</sup\>-carene$ and 3-caronaldehyde: rate
constants and product yields},
journal = {Atmospheric chemistry and physics},
volume = {21},
number = {16},
issn = {1680-7324},
address = {Katlenburg-Lindau},
publisher = {EGU},
reportid = {FZJ-2021-04154},
pages = {12665 - 12685},
year = {2021},
abstract = {The oxidation of Δ3-carene and one of its main oxidation
products, caronaldehyde, by the OH radical and O3 was
investigated in the atmospheric simulation chamber SAPHIR
under atmospheric conditions for NOx mixing ratios below
2 ppbv. Within this study, the rate constants of the
reaction of Δ3-carene with OH and O3 and of the reaction of
caronaldehyde with OH were determined to be
(8.0±0.5)×10−11 cm3 s−1 at 304 K,
(4.4±0.2)×10−17 cm3 s−1 at 300 K and
(4.6±1.6)×10−11 cm3 s−1 at 300 K, in agreement
with previously published values. The yields of
caronaldehyde from the reaction of OH and ozone with
Δ3-carene were determined to be 0.30±0.05 and 0.06±0.02,
respectively. Both values are in reasonably good agreement
with reported literature values. An organic nitrate (RONO2)
yield from the reaction of NO with RO2 derived from
Δ3-carene of 0.25±0.04 was determined from the analysis of
the reactive nitrogen species (NOy) in the SAPHIR chamber.
The RONO2 yield of the reaction of NO with RO2 derived from
the reaction of caronaldehyde with OH was found to be
0.10±0.02. The organic nitrate yields of Δ3-carene and
caronaldehyde oxidation with OH are reported here for the
first time in the gas phase. An OH yield of 0.65±0.10 was
determined from the ozonolysis of Δ3-carene. Calculations
of production and destruction rates of the sum of hydroxyl
and peroxy radicals (ROx=OH+HO2+RO2) demonstrated that there
were no unaccounted production or loss processes of radicals
in the oxidation of Δ3-carene for conditions of the chamber
experiments. In an OH-free experiment with added OH
scavenger, the photolysis frequency of caronaldehyde was
obtained from its photolytical decay. The experimental
photolysis frequency was a factor of 7 higher than the value
calculated from the measured solar actinic flux density, an
absorption cross section from the literature and an assumed
effective quantum yield of unity for photodissociation.},
cin = {IEK-8},
ddc = {550},
cid = {I:(DE-Juel1)IEK-8-20101013},
pnm = {2111 - Air Quality (POF4-211)},
pid = {G:(DE-HGF)POF4-2111},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000691776500002},
doi = {10.5194/acp-21-12665-2021},
url = {https://juser.fz-juelich.de/record/902291},
}