% IMPORTANT: The following is UTF-8 encoded. This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.
@ARTICLE{Fuchs:62344,
author = {Fuchs, H. and Holland, F. and Hofzumahaus, A.},
title = {{M}easurement of tropospheric {RO}2 and {HO}2 radicals by a
laser-induced fluorescence instrument ({RO}x{LIF})},
journal = {Review of scientific instruments},
volume = {79},
issn = {0034-6748},
address = {[S.l.]},
publisher = {American Institute of Physics},
reportid = {PreJuSER-62344},
pages = {084104-1 - 084104-12},
year = {2008},
note = {Record converted from VDB: 12.11.2012},
abstract = {A new method (ROxLIF) for the measurement of atmospheric
peroxy radicals (HO(2) and RO(2)) was developed using a
two-step chemical conversion scheme and laser-induced
fluorescence (LIF) for radical detection. Ambient air is
sampled into a differentially pumped flow reactor, in which
atmospheric RO(x) radicals (=RO(2)+RO+HO(2)+OH) are
chemically converted to HO(2) by a large excess of NO and CO
at reduced pressures (ROx mode). When only CO is added as a
reagent, the sum of atmospheric HO(2)+OH is converted to
HO(2) (HOx mode). At the reactor outlet, part of the air
flow is transferred into a low-pressure detection chamber,
where the HO(2) is further converted by reaction with NO to
OH, which is then detected with high sensitivity by LIF at
308 nm. The ROxLIF technique has been implemented in an
existing LIF instrument that is also capable of measuring
atmospheric OH. From the concurrent measurements of RO(x),
HO(x) and OH, concentrations of HO(2) and RO(2) can be
determined. The system is calibrated using the quantitative
photolysis of water vapor at 185 nm as a radical source.
Addition of CO or hydrocarbons to the calibration gas yields
well-defined concentrations of HO(2) or RO(2), respectively,
providing an estimated accuracy for the calibration of about
$20\%.$ The ROxLIF technique is extremely sensitive and has
detection limits (signal-to-noise ratio=2) of about 0.1 pptv
of HO(2) or RO(2) at a time resolution of 1 min. The paper
describes the technique and its calibration, discusses the
chemistry in the conversion reactor and possible
interferences, and gives an example of ambient air
measurements to demonstrate the performance of the new
technique.},
keywords = {J (WoSType)},
cin = {ICG-2},
ddc = {530},
cid = {I:(DE-Juel1)VDB791},
pnm = {Atmosphäre und Klima},
pid = {G:(DE-Juel1)FUEK406},
shelfmark = {Instruments $\&$ Instrumentation / Physics, Applied},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:19044365},
UT = {WOS:000259374500036},
doi = {10.1063/1.2968712},
url = {https://juser.fz-juelich.de/record/62344},
}