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The fate of meteoric metals in ice particles: effects of sublimation and energetic particle bombardment

Mangan, TP, Frankland, Victoria, Murray, BJ and Plane, JMC (2017) The fate of meteoric metals in ice particles: effects of sublimation and energetic particle bombardment Journal of Atmospheric and Solar-Terrestrial Physics, 161. pp. 143-149.

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Abstract

The uptake and potential reactivity of metal atoms on water ice can be an important process in planetary atmospheres and on icy bodies in the interplanetary and interstellar medium. For instance, metal atom uptake affects the gas-phase chemistry of the Earth's mesosphere, and has been proposed to influence the agglomeration of matter into planets in protoplanetary disks. In this study the fate of Mg and K atoms incorporated into water-ice films, prepared under ultra-high vacuum conditions at temperatures of 110–140 K, was investigated. Temperature-programmed desorption experiments reveal that Mg- and K-containing species do not co-desorb when the ice sublimates, demonstrating that uptake on ice particles causes irreversible removal of the metals from the gas phase. This implies that uptake on ice particles in terrestrial polar mesospheric clouds accelerates the formation of large meteoric smoke particles (≥1 nm radius above 80 km) following sublimation of the ice. Energetic sputtering of metal-dosed ice layers by 500 eV Ar+ and Kr+ ions shows that whereas K reacts on (or within) the ice surface to form KOH, adsorbed Mg atoms are chemically inert. These experimental results are consistent with electronic structure calculations of the metals bound to an ice surface, where theoretical adsorption energies on ice are calculated to be −68 kJ mol−1 for K, −91 kJ mol−1 for Mg, and −306 kJ mol−1 for Fe. K can also insert into a surface H2O to produce KOH and a dangling H atom, in a reaction that is slightly exothermic.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
NameEmailORCID
Mangan, TPUNSPECIFIEDUNSPECIFIED
Frankland, Victoriav.frankland@surrey.ac.ukUNSPECIFIED
Murray, BJUNSPECIFIEDUNSPECIFIED
Plane, JMCUNSPECIFIEDUNSPECIFIED
Date : 8 July 2017
Identification Number : 10.1016/j.jastp.2017.07.002
Copyright Disclaimer : © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords : Polar mesospheric cloudsMeteoric metalsMeteoric smoke particlesEnergetic particle bombardment
Depositing User : Melanie Hughes
Date Deposited : 23 Aug 2017 12:46
Last Modified : 23 Aug 2017 12:46
URI: http://epubs.surrey.ac.uk/id/eprint/842008

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