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• W1976984306 abstract "view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A geophysical determination of the thermal electron attachment coefficient of oxygen molecules. Sen, Hari K. ; Dubs, Charles W. Abstract The coefficient of attachment, p, of thermal electrons to oxygen molecules in the upper part of the troposphere has been calculated using the data from a nuclear burst at an altitude between 10,000 and 50,000 ft. Total initial gamma radiation doses were measured at a number of points (i) in the vicinity of the burst and the attenuation of a telemetering signal from each of these points to a ground point was measured (Haskel et a1.). The doses and a fraction of dose rate at a certain short time after burst lead to an inverse- square and exponential-attenuation formula for the electron production rate. The electron density at this time is essentially the production rate divided by the product of p and the oxygen number density; assuming a value of p, it is calculated at points along the telemetering ray path. The electron density, the electron collision frequency, and the ray frequency of nearly 225 Mc give the index of attenuation at the points. The index is numerically integrated over the ray path to give the attenuation. The value of p is chosen to make the calculated attenuations (inversely proportional to p) agree as nearly as possible with the measured attenuations. Preliminary corrections taking into account the pressure dependence of p (2 per cent change in ~), photodetachment (5 to 15 per cent increase in 6), and absorption due to negative ions (in- crease in 6 by a factor of 1.2 to 10) lead to the calculated values of 6 in the following table: Caic. 3 Exp. a i Caic. 3 Exp. a 4 2.25 5.3 10 .552 .579 5 1.83 1.85 II .424 .367 6 1.35 3.74 13 .181 .126 7 1.23 1.51 14 .114 .0434 8 .964 3.19 15 .0752 .0438 9 .713 .821 and to a value of K, the ratio of p divided by the oxygen number density, of K = 7.2 X I0-~~ cm6 sec~'. This value of K is about three times that recently measured at room temperature by Chanin and Biondi (1958). It is interesting to note that the observed decrease in the echo rate of long-enduring echoes from Perseid and Arietid meteors, height approximately 8o km, leads to a value of K agreeing with ours within a factor of 2 (Kaiser 1953). REFERENCES Chanin and Biondi, 1958, Air Force Cambridge Research Conference, Nov. 20-23. Haskel et at., AFSWP, WT-IIoI, Appendix C (Confidential report). Kaiser, T. R. 1953, Advances in Physics II, 536. Geophysics Research Directorate, Air Force Cambridge Research Center, Cambridge, Mass. Publication: The Astronomical Journal Pub Date: 1959 DOI: 10.1086/107983 Bibcode: 1959AJ.....64Q.131S full text sources ADS |" @default.
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• W1976984306 date "1959-01-01" @default.
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• W1976984306 title "A geophysical determination of the thermal electron attachment coefficient of oxygen molecules." @default.
• W1976984306 doi "https://doi.org/10.1086/107983" @default.
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