The Role of Excited Oxygen Molecules in the Formation of the Secondary Ozone Layer at 87 to 97 km
Hänninen, K. (2018). The Role of Excited Oxygen Molecules in the Formation of the Secondary Ozone Layer at 87 to 97 km. Environment and Ecology Research, 6 (1), 74-85. doi:10.13189/eer.2018.060107
Published in
Environment and Ecology ResearchAuthors
Date
2018Discipline
Ympäristötiede ja -teknologiaCopyright
© 2018, the Authors. This is an open access article distributed under the terms of a Creative Commons License.
The secondary ozone layer is located at
elevations of 87 to 97 km in the upper mesosphere – lower
thermosphere. It overlaps with the ionospheric D-layer.
Daytime intensive UV radiation is dissociating O2
molecules to O atoms and photoexcitating O2 molecules up
to 11.07eV level. Ozone photolysis between the
wavelengths of 118.7–121.6 nm produces three oxygen
atoms from one ozone molecule. Collision reactions of
O2(B3
Σu
—) and O2(X3
Σg
—, υ≥26) with O2(X3
Σg
—, υ=0)
produce additional oxygen atoms. The number of oxygen
atoms is maintained at such a high level that a small but
significant ozone concentration survives. UV radiation
weakens radically during the night. The number of O atoms
shows no diurnal variation in the MLT. This leads to a
ten-fold increase of ozone concentration over the course of
the night. Dissociative recombination of O2
+ (entered via
diffusion from above) and reactions of O (3
P) atoms with
excited O2 molecules generate O(1
S) atoms. The quenching
of O(1
S)→O(1
D) emits the green nightglow. The reactions
of O(1
D) with ozone and O2 absorption of UV nightglow
produce O2(c1
Σu
—, A’3
∆u and A3
Σu
+
). When these
molecules relax, they emit the O2 UV nightglows. The
relaxations of O2(a1
∆g) and O2(b1
Σg
+
) emit infrared
nightglows.
...
Publisher
Horizon Research PublishingISSN Search the Publication Forum
2331-625XKeywords
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http://www.hrpub.org/download/20180228/EER7-14010619.pdfMetadata
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Except where otherwise noted, this item's license is described as © 2018, the Authors. This is an open access article distributed under the terms of a Creative Commons License.
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