Resolving the mesospheric nighttime 4.3 µm emission puzzle: Laboratory demonstration of new mechanism for OH(υ) relaxation
Abstract We report laboratory results that support a recently proposed mechanism for relaxation of highly vibrationally excited hydroxyl radical by ground‐state oxygen atoms (Sharma et al., GRL 42, 4639–4647 (2015)). According to this mechanism, which eventually leads to an enhancement of nocturnal...
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| Format: | Article |
| Language: | English |
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Wiley
2016-09-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2016GL069645 |
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| author | Konstantinos S. Kalogerakis Daniel Matsiev Ramesh D. Sharma Peter P. Wintersteiner |
| author_facet | Konstantinos S. Kalogerakis Daniel Matsiev Ramesh D. Sharma Peter P. Wintersteiner |
| author_sort | Konstantinos S. Kalogerakis |
| collection | DOAJ |
| description | Abstract We report laboratory results that support a recently proposed mechanism for relaxation of highly vibrationally excited hydroxyl radical by ground‐state oxygen atoms (Sharma et al., GRL 42, 4639–4647 (2015)). According to this mechanism, which eventually leads to an enhancement of nocturnal 4.3 µm CO2 emissions in the mesosphere, the deactivation of OH(high υ) by O(3P) involves a fast, spin‐allowed, multiquantum vibration‐to‐electronic (V‐E) energy transfer process generating O(1D). We present laser‐based experiments that demonstrate these energy transfer processes in action and discuss some implications of the new mechanism for mesospheric OH. These developments represent a breakthrough addressing the long‐standing problem of unacceptably large discrepancies between models and observations of the nocturnal mesospheric 4.3 µm emission. |
| format | Article |
| id | doaj-art-8305ff9cf5cd4fa7830512428c9643ec |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2016-09-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-8305ff9cf5cd4fa7830512428c9643ec2025-08-20T02:31:42ZengWileyGeophysical Research Letters0094-82761944-80072016-09-0143178835884310.1002/2016GL069645Resolving the mesospheric nighttime 4.3 µm emission puzzle: Laboratory demonstration of new mechanism for OH(υ) relaxationKonstantinos S. Kalogerakis0Daniel Matsiev1Ramesh D. Sharma2Peter P. Wintersteiner3Center for Geospace Studies SRI International Menlo Park California USACenter for Geospace Studies SRI International Menlo Park California USAInstitute for Scientific Research Boston College Newton Massachusetts USAArcon Corporation Waltham Massachusetts USAAbstract We report laboratory results that support a recently proposed mechanism for relaxation of highly vibrationally excited hydroxyl radical by ground‐state oxygen atoms (Sharma et al., GRL 42, 4639–4647 (2015)). According to this mechanism, which eventually leads to an enhancement of nocturnal 4.3 µm CO2 emissions in the mesosphere, the deactivation of OH(high υ) by O(3P) involves a fast, spin‐allowed, multiquantum vibration‐to‐electronic (V‐E) energy transfer process generating O(1D). We present laser‐based experiments that demonstrate these energy transfer processes in action and discuss some implications of the new mechanism for mesospheric OH. These developments represent a breakthrough addressing the long‐standing problem of unacceptably large discrepancies between models and observations of the nocturnal mesospheric 4.3 µm emission.https://doi.org/10.1002/2016GL069645hydroxylatomic oxygen4.3 µm emissionmesosphereenergy transfer |
| spellingShingle | Konstantinos S. Kalogerakis Daniel Matsiev Ramesh D. Sharma Peter P. Wintersteiner Resolving the mesospheric nighttime 4.3 µm emission puzzle: Laboratory demonstration of new mechanism for OH(υ) relaxation Geophysical Research Letters hydroxyl atomic oxygen 4.3 µm emission mesosphere energy transfer |
| title | Resolving the mesospheric nighttime 4.3 µm emission puzzle: Laboratory demonstration of new mechanism for OH(υ) relaxation |
| title_full | Resolving the mesospheric nighttime 4.3 µm emission puzzle: Laboratory demonstration of new mechanism for OH(υ) relaxation |
| title_fullStr | Resolving the mesospheric nighttime 4.3 µm emission puzzle: Laboratory demonstration of new mechanism for OH(υ) relaxation |
| title_full_unstemmed | Resolving the mesospheric nighttime 4.3 µm emission puzzle: Laboratory demonstration of new mechanism for OH(υ) relaxation |
| title_short | Resolving the mesospheric nighttime 4.3 µm emission puzzle: Laboratory demonstration of new mechanism for OH(υ) relaxation |
| title_sort | resolving the mesospheric nighttime 4 3 µm emission puzzle laboratory demonstration of new mechanism for oh υ relaxation |
| topic | hydroxyl atomic oxygen 4.3 µm emission mesosphere energy transfer |
| url | https://doi.org/10.1002/2016GL069645 |
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