Double photoionization and doubly charged ions in the thermosphere | Zendy

Victor G. A. | Zendy; Constantinides E. R. | Zendy

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Double photoionization and doubly charged ions in the thermosphere

Author(s) -

Victor G. A.,

Constantinides E. R.

Publication year - 1979

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/gl006i006p00519

Subject(s) - thermosphere , photoionization , ion , atomic physics , ionization , physics , charge exchange , ionosphere , sink (geography) , atmospheric sciences , astronomy , quantum mechanics , cartography , geography

We show that a plausible cross section for double photoionization of atomic oxygen, hν ( λ < 254 Å ) + O → O 2 e yields the dominant source mechanism for O ++ in the thermosphere. With this large source, harmony is obtained between the measured O ++ concentrations and the large (k ∼ 10 −9 cm³ s −1 ) measured sink (by charge exchange with molecular species) at altitudes above about 250 km.

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