First observation of the OIO molecule by time-resolved flash photolysis absorption spectroscopy

Himmelmann, S.; Orphal, J.; Bovensmann, H.; Richter, Andreas; Ladstätter-Weißenmayer, A.; Burrows, J. P.

doi:10.1016/0009-2614(96)00114-5

Cited by 60 publications

(68 citation statements)

References 11 publications

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“…Vibrational assignments of theÃ−X band system and positions of the vibronic band centers between 15 120 cm −1 and 20 753 cm −1 (482 nm to 661 nm) are tabulated in Himmelmann et al (1996).…”

Section: Comments On Preferred Valuesmentioning

confidence: 99%

Evaluated kinetic and photochemical data for atmospheric chemistry: Volume III – gas phase reactions of inorganic halogens

et al. 2007

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Abstract. This article, the third in the series, presents kinetic and photochemical data evaluated by the IUPAC Subcommittee on Gas Kinetic Data Evaluation for Atmospheric Chemistry. It covers the gas phase and photochemical reactions of inorganic halogen species, which were last published in J. Phys. Chem. Ref. Data, in 2000 (Atkinson et al., 2000, were updated on the IUPAC website in 2003 and are updated again in the present evaluation. The article consists of a summary sheet, containing the recommended kinetic parameters for the evaluated reactions, and five appendices containing the data sheets, which provide information upon which the recommendations were made.

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Section: Comments On Preferred Valuesmentioning

confidence: 99%

Evaluated kinetic and photochemical data for atmospheric chemistry: Volume III – gas phase reactions of inorganic halogens

et al. 2007

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“…The radical has a substantial absorption cross section between about 480 and 650 nm (Himmelmann et al, 1996), with bands that are rotationally unresolved and do not fluoresce (Ashworth et al, 2002;Bloss et al, 2001). However, it is not yet clear whether absorption leads to photodissociation to I+O 2 , or interconversion to the ground state followed by quenching.…”

Section: Model Descriptionmentioning

confidence: 99%

Modelling molecular iodine emissions in a coastal marine environment: the link to new particle formation

et al. 2006

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Abstract.A model of iodine chemistry in the marine boundary layer (MBL) has been used to investigate the impact of daytime coastal emissions of molecular iodine (I 2 ). The model contains a full treatment of gas-phase iodine chemistry, combined with a description of the nucleation and growth, by condensation and coagulation, of iodine oxide nano-particles. In-situ measurements of coastal emissions of I 2 made by the broadband cavity ring-down spectroscopy (BBCRDS) and inductively coupled plasmamass spectrometry (ICP/MS) techniques are presented and compared to long path differential optical absorption spectroscopy (DOAS) observations of I 2 at Mace Head, Ireland. Simultaneous measurements of enhanced I 2 emissions and particle bursts show that I 2 is almost certainly the main precursor of new particles at this coastal location. The ratio of IO to I 2 predicted by the model indicates that the iodine species observed by the DOAS are concentrated over a short distance (about 8% of the 4.2 km light path) consistent with the intertidal zone, bringing them into good agreement with the I 2 measurements made by the two in-situ techniques. The model is then used to investigate the effect of iodine emission on ozone depletion, and the production of new particles and their evolution to form stable cloud condensation nuclei (CCN).

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“…Broadband radiation centred at around 660 nm with a bandwidth of approximately 15 nm FWHM was generated by and A 2 B 2 ← X 2 B 1 electronic transitions. Although the most strongly absorbing vibrational band of OIO's visible absorption spectrum is the (5,1,0) ← (0,0,0) band at 548 nm (Himmelmann et al, 1996), the (4,1,0) ← (0,0,0) band at 568 nm has a slightly larger differential absorption cross section and was selected for this work. The requisite radiation was obtained from the dye laser using a solution of Rhodamine 6G in methanol and water.…”

Section: The Broadband Light Sourcementioning

confidence: 99%

A broadband cavity ringdown spectrometer for in-situ measurements of atmospheric trace gases

et al. 2005

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Abstract. This paper describes a broadband cavity ringdown spectrometer and its deployment during the 2002 North Atlantic Marine Boundary Layer Experiment (NAMBLEX) to measure ambient concentrations of NO 3 , N 2 O 5 , I 2 and OIO at the Mace Head Atmospheric Research Station, Co. Galway, Ireland. The effective absorption path lengths accessible with the spectrometer generally exceeded 10 km, enabling sensitive localised "point" measurements of atmospheric absorbers to be made adjacent to the other instruments monitoring chemically related species at the same site. For the majority of observations, the spectrometer was used in an open path configuration thereby avoiding surface losses of reactive species. A subset of observations targeted the N 2 O 5 molecule by detecting the additional NO 3 formed by the thermal dissociation of N 2 O 5 . In all cases the concentrations of the atmospheric absorbers were retrieved by fitting the differential structure in the broadband cavity ringdown spectra using a methodology adapted from long path differential optical absorption spectroscopy. The uncertainty of the retrieval depends crucially on the correct treatment and fitting of the absorption bands due to water vapour, a topic that is discussed in the context of analysing broadband cavity ringdown spectra. The quality of the measurements and the retrieval method are illustrated with representative spectra acquired during NAMBLEX in spectral regions around 660 nm (NO 3 and N 2 O 5 ) and 570 nm (I 2 and OIO). Typical detection limits were 1 pptv for NO 3 in an integration time of 100 s, 4 pptv for OIO and 20 pptv for I 2 in an integration time of 10 min. Additionally, the concentrations of atmospheric water vapour and the aerosol optical extinction were retrieved in both spectral regions. A companion paper in this issue presents the time series of the measurements and discusses their significance for understanding the variability of short lived nitrogen and iodine compounds in the marine boundary layer.

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First observation of the OIO molecule by time-resolved flash photolysis absorption spectroscopy

Cited by 60 publications

References 11 publications

Evaluated kinetic and photochemical data for atmospheric chemistry: Volume III – gas phase reactions of inorganic halogens

Evaluated kinetic and photochemical data for atmospheric chemistry: Volume III – gas phase reactions of inorganic halogens

Modelling molecular iodine emissions in a coastal marine environment: the link to new particle formation

A broadband cavity ringdown spectrometer for in-situ measurements of atmospheric trace gases

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