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Mélen, F.; Mahieu, Emmanuel; Zander, Rodolphe; Rinsland, C. P.; Demoulin, Philippe; Roland, G.; Delbouille, L.; Servais, Christian

doi:10.1023/a:1005847829686

Cited by 13 publications

(4 citation statements)

References 19 publications

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“…The site has been shown to be excellent for studies on new particle formation (Bianchi et al 2016) or aerosol-cloud interaction, including mixed-phase and glaciated clouds Verheggen et al 2007). In addition, remote sensing investigations have been performed by FTIR spectroscopy, which allows for quasisimultaneous investigation of total column concentrations of a large number of gaseous constituents (e.g., Barret et al 2002Barret et al , 2003aDe Mazière et al 1999;Dils et al 2011;Duchatelet et al 2009Duchatelet et al , 2010Krieg et al 2005;Mahieu et al 1997;Melen et al 1998;Rinsland et al 1991Rinsland et al , 1992Rinsland et al , 1996Rinsland et al , 2000Rinsland et al , 2008Vigouroux et al 2007;Zander et al 2008Zander et al , 2010. JFJ is exposed mostly to FT air masses in autumn and winter.…”

Section: Region Vi: Europementioning

confidence: 99%

A review of atmospheric chemistry observations at mountain sites

Okamoto

Tanimoto

2016

Prog. in Earth and Planet. Sci.

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Located far from anthropogenic emission sources, high-altitude mountain stations are considered to be ideal sites for monitoring climatic and environmentally important baseline changes in free tropospheric trace gases and aerosols. In addition, the observations taken at these stations are often used to study the long-range transport of dust as well as anthropogenic and biomass burning pollutants from source regions and to evaluate the performance of global and regional models. In this paper, we summarize the results from past and ongoing field measurements of atmospheric constituents at high-altitude stations across the globe, with particular emphasis on reactive trace species including tropospheric ozone, along with its precursors such as carbon monoxide, nitrogen oxides, total reactive nitrogen, and nonmethane hydrocarbons. Over the past decades, our understanding of the temporal variability and meteorological mechanisms of long-range transport has advanced in tandem with progress in instrumentation and modeling. Finally, the future needs of atmospheric chemistry observations at mountain sites are addressed.

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Section: Region Vi: Europementioning

confidence: 99%

A review of atmospheric chemistry observations at mountain sites

Okamoto

Tanimoto

2016

Prog. in Earth and Planet. Sci.

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“…)4 have been detected in the stratosphere and, with the exception of COFCl, in the troposphere as well, and signiÐcant concentration increases have been observed. 4 and COFCl are COCl 2 mainly photolytically or chemically produced from fully or partially halogenated chloro(Ñuoro)carbon precursor molecules (CFCs and HCFCs).5h7 Tropospheric carbonyl halides are essentially unreactive because they will primarily be removed by heterogeneous decomposition through contact with surfaces and liquid phase hydrolysis, particularly within clouds.6,7 In the stratosphere, however, photolysis becomes the major removal pathway besides transport into the troposphere, and the released chlorine can participate in the catalytic destruction of ozone. 7 Second, carbonyl halides serve as an easily accessible prototype for the study of an up to date only scarcely investigated chemical elementary process : the photo-induced decomposition of a molecule into three fragments, ABC ] hl ] A ] B ] C.8 What makes carbonyl halides unique in this respect, is the production of easily detectable fragments such as chlorine atoms upon irradiation in an easily accessible ultraviolet (UV) wavelength range.…”

Section: Introductionmentioning

confidence: 99%

Photodissociation dynamics of carbonyl chloride fluoride and its implications for phosgene three body decay

Maul¹,

Dietrich²,

Haas³

et al. 1999

Phys. Chem. Chem. Phys.

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The photodissociation dynamics of COFCl has been studied by monitoring Cl fragments by resonance enhanced multi-photon ionisation and time-of-Ñight techniques at dissociation wavelengths near 235 nm. The COFCl heat of formation and the dissociation energy for CwCl bond Ðssion were for the Ðrst time experimentally determined :(COFCl) \ [397 ^15 kJ mol~1 and kJ mol~1.of the available energy is channelled into FCO rotation and bending vibration. The remaining energy is released as product translation. Other than in phosgene, no spinÈorbit state selective behaviour is observed. The observations agree with a decay mechanism within the COFCl molecular plane as well as with a fragmentation via out-of-plane movement of the departing Cl atom. The structural and electronic similarity of COFCl and allows conclusions to be drawn on the dissociation. The Ðndings are evidence for a COCl 2 COCl 2 previously proposed decay mechanism for the asynchronous concerted three body decay of phosgene into CO ] 2Cl. The Ðrst bond cleavage produces ground and excited spinÈorbit state Cl and Cl*, respectively, with large kinetic energy release, while breaking the second CwCl bond exclusively generates slow ground state Cl atoms.

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“…The detection of this molecule in the lower stratosphere [4,5] along with other halo-carbonyl compounds (COCl 2 , COF 2 ) [6,7], however, has resulted in renewed interest in ClFCO due to its possible role in the ozone-depletion process: it is one of the stable products of the decomposition of halogenated chloro(fluoro)carbons (CFCs and HCFCs) [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Predissociative T₁and S₁states of carbonyl chlorofluoride (ClFCO) and their photodissociation pathways

Lee

Baeck

2011

Molecular Physics

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The low-lying electronic states of carbonyl chlorofluoride (ClFCO) were studied using the coupled-cluster singles and doubles (CCSD) method. Highly reliable values for not only the geometrical parameters, but also the vibrational properties were generated for T 1 and S 1 as well as S 0 . Potential energy surfaces (PESs) of the dissociation of the three bonds were also obtained for each electronic state separately. We found that the T 1 and S 1 states are both vibrationally predissociative along the C-Cl bond dissociation channel, with barrier heights of only 0.13 and 0.23 eV, respectively. The relative energies for the S 1 state of the barriers to C-Cl and C-F bond dissociation are 4.93 and 6.13 eV, respectively, with respect to S 0 . These results suggest that a simple C-Cl bond dissociation pathway can explain the results of a previous photodissociation experiment with 235 nm (5.276 eV) light, in which only 'Cl þ FCO' fragments were observed.

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Untitled

Cited by 13 publications

References 19 publications

A review of atmospheric chemistry observations at mountain sites

A review of atmospheric chemistry observations at mountain sites

Photodissociation dynamics of carbonyl chloride fluoride and its implications for phosgene three body decay

Predissociative T₁and S₁states of carbonyl chlorofluoride (ClFCO) and their photodissociation pathways

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Untitled

Cited by 13 publications

References 19 publications

A review of atmospheric chemistry observations at mountain sites

A review of atmospheric chemistry observations at mountain sites

Photodissociation dynamics of carbonyl chloride fluoride and its implications for phosgene three body decay

Predissociative T1and S1states of carbonyl chlorofluoride (ClFCO) and their photodissociation pathways

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Predissociative T₁and S₁states of carbonyl chlorofluoride (ClFCO) and their photodissociation pathways