Investigation of atomic oxygen in mass spectrometer ion sources

Lake, L. R.; Mauersberger, K.

doi:10.1016/0020-7381(74)83022-6

Cited by 9 publications

(2 citation statements)

References 6 publications

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“…Most of the incoming oxygen atoms recombine into molecular oxygen, even in a quasi-open ion source such as the one used here. Similar results were found in laboratory studies by Lake and Mauersberger [1974], who directed a neutral atomic oxygen beam into an open ion source. Krankowsky et al [1974] reported in a satellite mass spectrometer experiment having a far more open ion source than the one of the OSS instrument a large molecular oxygen peak in the altitude region where atomic oxygen is dominant.…”

Section: Instrument Performance and Data Analysissupporting

confidence: 86%

Seasonal variation of neutral thermospheric constituents in the Northern Hemisphere

Mauersberger¹,

Kayser²,

Potter³

et al. 1976

J. Geophys. Res.

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The Atmosphere Explorer‐C satellite carries a large number of experiments including an open source neutral mass spectrometer. Among the measurements obtained with this instrument were ones of particle densities of N2, O, and He at northern latitudes in early February and late June 1974. The orbital geometry of the satellite was such that comparisons could be made for the winter/summer season at the same altitudes and latitudes and at similar local solar times. The helium density shows in midmorning a winter/summer enhancement of a factor of 29 at 400 km. The enhancement at other altitudes, both higher and lower, is less. At 250 km the winter/summer oxygen ratio is 1.7, whereas the winter/summer nitrogen ratio is 0.6. Both ratios decrease with increasing altitudes. The analysis identifies an oxygen enhancement at low altitudes in winter and at high altitudes in summer.

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Section: Instrument Performance and Data Analysissupporting

confidence: 86%

Seasonal variation of neutral thermospheric constituents in the Northern Hemisphere

Mauersberger¹,

Kayser²,

Potter³

et al. 1976

J. Geophys. Res.

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“…In the past, mass spectrometric measurement of atomic oxygen, a major constituent of the thermosphere at all altitudes, has been complicated by the presence of surface adsorption and recombination. Recent laboratory experiments using atomic oxygen beams [Lake and Mauersberger, 1974;Sjolander, 1976] have augmented prior empirical studies based on satellite data by providing a more detailed understanding of atomic oxygen-metal surface reactions. It is now customary on satellite-borne mass spectrometers to use the signal of O•.…”

Section: Introductionmentioning

confidence: 99%

The impact of gas‐surface reactions on mass spectrometric measurements of atomic nitrogen

Engebretson¹,

Mauersberger²

1979

J. Geophys. Res

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Recently, atomic nitrogen has been measured in the upper thermosphere with a mass spectrometer carried on the Atmosphere Explorer satellites. Only a small fraction of N atoms are directly measured by the mass spectrometer, however. The majority appear as NO, formed within the ion source. Occasionally a relatively large NO: signal has also been observed, showing a strong dependence on the ion source surface temperature. Comparison of a numerical simulation of the reactions leading to NO: with data obtained in circular orbits on AE-C provides insight into the pertinent chemical reactions. It demonstrates that the techniques used in open source neutral mass spectrometer operation--warmup and outgassing of the source before measurements--were successful in minimizing the effects of this contaminant. ß '/' *e% * * * ß •oo ø d' • ß ß o ø ß ß ß ßß ß ß ß .

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Influence of surface recombination in satellite atomic oxygen measurements inferred from the AEROS‐A mass spectrometer

Lake¹,

Krankowsky²

1975

Geophysical Research Letters

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Although the assumption of complete and immediate recombination of atmospheric atomic oxygen at the surfaces of the open ion source of the AEROS‐A mass spectrometer is reasonable below 300 km, application of this assumption at higher altitudes results in a substantial underestimation of the ambient density of atomic oxygen. A two layer surface model seems necessary to explain the observations. Parameters for several surface reaction processes are estimated.

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Investigation of atomic oxygen in mass spectrometer ion sources

Cited by 9 publications

References 6 publications

Seasonal variation of neutral thermospheric constituents in the Northern Hemisphere

Seasonal variation of neutral thermospheric constituents in the Northern Hemisphere

The impact of gas‐surface reactions on mass spectrometric measurements of atomic nitrogen

Influence of surface recombination in satellite atomic oxygen measurements inferred from the AEROS‐A mass spectrometer

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