GPP: description and transnational access
The interuniversitary laboratory of Atmospheric Systems has develooped since the early 90s a simulation chamber which is dedicated to gas-phase processes from which more than 20 papapers have been published. The gas phase LISA chamber which is dedicaced to the study of gas-phase processes is an evacuable Pyrex photoreactor equipped with two in situ spectrometry path ways. This chamber has been developped for gas-phase reactivity studies but is also a unique infrastructure for mid-high resolution spectroscopic studies in both UV-visible and IR spectral ranges which makes this facility a powerful tools for satellite data validation. GPP is part of the Transnational Access of Euochamp-2.
2. Description of the research facility
2.1. Technical data
The gas phase LISA chamber which is dedicaced to the study of gas-phase processes is an evacuable Pyrex photoreactor of 977 liters. The surface-to-volume ratio is equal to 9 my-1. The reactor is surrounded by two sets of 40 fluorescent tubes (Philips TL05 and TL03) and 16 arc lamps that provide an irradiation with a broad spectral range from 300 to 600 nm. This reactor is equipped with two in situ multiple reflection optical systems interfaced to a FTIR spectrometer and to an UV-visible absorption spectrometer. The IR channel allows one to acquire spectra between 600 and 4000 cm-1 with a resolution of 0.013cm-1 and a optimum optical path length of 660 m. The UV-visible channel allows to acquire spectra from 250 to 650 nm with a resolution of 0.15 nm and a optimum optical path length of 72 m. Complementary analytical devices (GC-MS, HPLC, monitors) are also available.
Gratien A., M. Lefort, B. Picquet-Varrault, J. Orphal, J-F. Doussin and J-M. Flaud ; Experimental intercomparison of the absorption cross-sections of nitrous acid (HONO) in the ultraviolet and mid-infrared spectral regions, Journal of quantitative Spectroscopy and Radiative transfert, Volume: 110, Issue: 4-5,Pages:256-263; 2009
2.4. Access to the chamber under Eurochamp TA
Requests for access to the PARIS12 chamber are processed centrally within EUROCHAMP 2. The users will have access to all equipements of the infrastructure for the duration of the stay. The planning of the experiments will be decided jointly between the staff of LISA and the visitors. The minimum duration of the stay is 5 days but typical duration are 1-3 weeks. Users will work directly with LISA staff i.e. Pr. Jean-François Doussin, Dr. Yasmine Katrib-Kouchnir, Edouard Pangui (Ing), Dr. Emilie Perraudin, Dr. Sebastien Perrier or Dr. Bénédicte Picquet-Varrault. Unit of access is defined as one day spent by any group at the PARIS12 chamber. The full time period is counted from the day of arrival until the day of departure; the eligible period thus includes also the preparatory phase to set up instruments at the beginning. The cleaning periods are counted as well (generally performed overnight, it can sometime be longer depending the experiment performed or the sensitivity of the experiment planned to the background reactivity). Of course, the chamber cannot be used for other purposes during this cleaning procedure. The access include consumables, maintenance, staff for experiment days and preparatory work (about 25% of experiment time) at the facility.
3. Institution in charge of the laboratory facility
3.1. Contact Information
Prof. Jean-François Doussin, phone: +33 1 45 17 15 85, fax: +33 1 45 17 15 64
Dr. Bénédicte Picquet-Varrault, phone: +33 1 45 17 15 86, fax: +33 1 45 17 15 64
Equipe MEREIA (Reactivity and Measurements of Species of Atmospheric Interest)
4. Additional Information