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Digitale Medien

Measurements of free radicals in the atmosphere by matrix isolation and electron paramagnetic resonance (1978)

Mihelcic, D. ; Ehhalt, D. H. ; Kulessa, G. F. ; [weitere]

Springer

Pure and applied geophysics 116 (1978), S. 530-536

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ISSN: 1420-9136

Schlagwort(e): Electron paramagnetic resonance ; Free radicals ; Matrix isolation

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Abstract With some special adaptations the technique of matrix isolation followed by detection through electron paramagnetic resonance (EPR) can also be used for the measurement of atmospheric radical concentrations. A light weight cryogenic sampling device has been constructed. It uses condensation of atmospheric CO2 or H2O at 77 K for matrix formation and trapping of the radicals. The sampler has been flown on a balloon for stratospheric sampling. First data on stratospheric, HO2 and NO2 at 32 km altitude have been obtained on a flight on 8 August 1976 and will be reported.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01636905

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Digitale Medien

An improved method of measuring tropospheric NO2 and RO2 by matrix isolation and electron spin resonance (1985)

Mihelcic, D. ; Müsgen, P. ; Ehhalt, D. H.

Springer

Journal of atmospheric chemistry 3 (1985), S. 341-361

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ISSN: 1573-0662

Schlagwort(e): Peroxyradicals ; NO2 ; in-situ measurement ; matrix isolation ; electron spin resonance

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie , Geologie und Paläontologie

Notizen: Abstract A cryogenic system for the airborne and ground based sampling of ambient radicals by matrix isolation is described. The trapped radicals, e.g., NO2 and RO2, are analyzed by ESR. The technique has been improved, mainly by addition of water vapor to the sampled air, to yield a collection efficiency of (90±10)% and a lower detection limit of about 20 ppt, but it still does not distinguish between the different RO2. Careful calibration reduced the measurement error (1 σ) to ±10% for NO2 and ±15% for HO2. Two diurnal variations of RO2 and NO2 at ground level and vertical profiles in the lower troposphere are presented.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00122523

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