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| Titel |
In situ detection of atomic and molecular iodine using Resonance and Off-Resonance Fluorescence by Lamp Excitation: ROFLEX |
| VerfasserIn |
J. C. Gómez Martín, J. Blahins, U. Gross, T. Ingham, A. Goddard, A. S. Mahajan, A. Ubelis, A. Saiz-Lopez |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 4, no. 1 ; Nr. 4, no. 1 (2011-01-19), S.29-45 |
| Datensatznummer |
250001565
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| Publikation (Nr.) |
 copernicus.org/amt-4-29-2011.pdf |
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| Zusammenfassung |
| We demonstrate a new instrument for in situ detection of atmospheric iodine
atoms and molecules based on atomic and molecular resonance and
off-resonance ultraviolet fluorescence excited by lamp emission. The
instrument combines the robustness, light weight, low power consumption and
efficient excitation of radio-frequency discharge light sources with the
high sensitivity of the photon counting technique. Calibration of I2
fluorescence is achieved via quantitative detection of the molecule by
Incoherent Broad Band Cavity-enhanced Absorption Spectroscopy. Atomic iodine
fluorescence signal is calibrated by controlled broad band photolysis of
known I2 concentrations in the visible spectral range at atmospheric
pressure. The instrument has been optimised in laboratory experiments to
reach detection limits of 1.2 pptv for I atoms and 13 pptv for I2, for
S/N = 1 and 10 min of integration time. The ROFLEX system has been
deployed in a field campaign in northern Spain, representing the first
concurrent observation of ambient mixing ratios of iodine atoms and
molecules in the 1–350 pptv range. |
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