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@ARTICLE{Duan:866654,
      author       = {Duan, Jun and Qin, Min and Ouyang, Bin and Fang, Wu and Li,
                      Xin and Lu, Keding and Tang, Ke and Liang, Shuaixi and Meng,
                      Fanhao and Hu, Zhaokun and Xie, Pinhua and Liu, Wenqing and
                      Häsler, Rolf},
      title        = {{D}evelopment of an incoherent broadband cavity-enhanced
                      absorption spectrometer for in situ measurements of {HONO}
                      and {NO} 2},
      journal      = {Atmospheric measurement techniques},
      volume       = {11},
      number       = {7},
      issn         = {1867-8548},
      address      = {Katlenburg-Lindau},
      publisher    = {Copernicus},
      reportid     = {FZJ-2019-05733},
      pages        = {4531 - 4543},
      year         = {2018},
      abstract     = {Gaseous nitrous acid (HONO) is an important source of OH
                      radicals in the troposphere. However, its source, especially
                      that during daytime hours remains unclear. We present an
                      instrument for simultaneous unambiguous measurements of HONO
                      and NO2 with high time resolution based on incoherent
                      broadband cavity-enhanced absorption spectroscopy (IBBCEAS).
                      To achieve robust performance and system stability under
                      different environment conditions, the current IBBCEAS
                      instrument has been developed with significant improvements
                      in terms of efficient sampling as well as resistance against
                      vibration and temperature change, and the IBBCEAS instrument
                      also has low power consumption and a compact design that can
                      be easily deployed on different platforms powered by a
                      high-capacity lithium ion battery. The effective cavity
                      length of the IBBCEAS was determined using the absorption of
                      O2-O2 to account for the “shortening” effect caused by
                      the mirror purge flows. The wall loss for HONO was estimated
                      to be $2.0 \%$ via a HONO standard generator. Measurement
                      precisions (2σ) for HONO and NO2 are about 180 and
                      340 ppt in 30 s, respectively. A field inter-comparison
                      was carried out at a rural suburban site in Wangdu, Hebei
                      Province, China. The concentrations of HONO and NO2 measured
                      by IBBCEAS were compared with a long optical path absorption
                      photometer (LOPAP) and a NOx analyzer (Thermo Fisher
                      Electron Model 42i), and the results showed very good
                      agreement, with correlation coefficients (R2) of HONO and
                      NO2 being ∼0.89 and ∼0.95, respectively; in addition,
                      vehicle deployments were also tested to enable mobile
                      measurements of HONO and NO2, demonstrating the promising
                      potential of using IBBCEAS for in situ, sensitive, accurate
                      and fast simultaneous measurements of HONO and NO2 in the
                      future.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {243 - Tropospheric trace substances and their
                      transformation processes (POF3-243)},
      pid          = {G:(DE-HGF)POF3-243},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000468492900001},
      doi          = {10.5194/amt-11-4531-2018},
      url          = {https://juser.fz-juelich.de/record/866654},
}