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Preferential adsorption of para and ortho water molecules on charged nanoparticles in planetary ice clouds

Weidelt, Johanna 1; Dresch, Thomas 2; Duft, Denis ORCID iD icon 2; Leisner, Thomas ORCID iD icon 2
1 Universität Bielefeld (UB)
2 Institut für Meteorologie und Klimaforschung Atmosphärische Aerosolforschung (IMKAAF), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

In the Earth mesopause, nanometer-size singly charged particles form by condensation of evaporated meteorite material. Tey exhibit an enhanced water adsorption cross section due to the strong charge-dipole-interaction. In this work, we study how the nuclear spin state of water molecules afects this enhancement and whether there are conditions that could lead to the formation of spin-polarized ice. Due to symmetry constraints on the total molecular wave function, ortho (proton spins parallel) and para (spins antiparallel) water occupy
diferent rotational states, resulting in a diferent average dipole orientation in
electric felds. Terefore, we expect ortho and para water to exhibit distinct ad-
sorption enhancement factors onto charged nanoparticles. Based on Stark-shifs
of individual rotational states of water, average dipole orientations of a molecu-
lar ensemble and the resulting collision cross section was calculated for various
temperatures and particle sizes. We found that in the mesosphere of the Earth
(T~150K) the adsorption enhancement of ortho- and para- water is approxi-
mately equal while at lower temperatures prevailing around ice giant planets and
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Volltext §
DOI: 10.5445/IR/1000162395
Veröffentlicht am 22.09.2023
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung Atmosphärische Aerosolforschung (IMKAAF)
Publikationstyp Poster
Publikationsdatum 21.03.2023
Sprache Englisch
Identifikator KITopen-ID: 1000162395
HGF-Programm 12.11.12 (POF IV, LK 01) Atmospheric chemistry processes
Veranstaltung 86th Jahrestagung der DPG und DPG-Frühjahrstagung der Sektion Materie und Kosmos - Arbeitskreis Beschleunigerphysik (SMuK 2023), Dresden, Deutschland, 20.03.2023 – 24.03.2023
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