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ABSTRACT There has been recent considerable interest in the stratospheric ion composition and ion chemistry, especially in view of its possible impact on aerosol formation1,2 and the

possibility of detection of minor constituents with very low concentrations3,4. The first composition measurements of positive ions in the stratosphere conducted by a rocket-borne

instrument5, revealed the existence of the theoretically predicted proton hydrates (PH)6 and also of some unexpected non-proton hydrates (NPH). (Proton hydrates are primarily ions of the

form H+(H2O)n.) Because low altitude rocket data may be biased by shock wave effects, such as ion fragmentation, the need for balloon flights was strongly felt. In 1978, data obtained with

balloon-borne instruments7–9 partly confirmed and extended the rocket data. There have been several explanations1,5,7,8,10 of the presence of the observed NPH, but the lack of resolution of

the data means an ambiguity still exists about the exact masses of these ions. We report here the first high resolution mass spectra of positive ions in the stratosphere, at 34-km altitude,

where the major mass peaks can be identified unambiguously. Access through your institution Buy or subscribe This is a preview of subscription content, access via your institution ACCESS

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Article Open access 21 February 2022 LABORATORY SPECTROSCOPY TECHNIQUES TO ENABLE OBSERVATIONS OF INTERSTELLAR ION CHEMISTRY Article 07 July 2020 THE PROTON SIZE Article 30 September 2020

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_Astrophys. J. Lett._ 168, L107–110 (1971). Article  ADS  CAS  Google Scholar  Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Belgian Institute for Space Aeronomy,

Ringlaan 3, Brussels, B-1180, Belgium E. Arijs, D. Nevejans & J. Ingels Authors * E. Arijs View author publications You can also search for this author inPubMed Google Scholar * D.

Nevejans View author publications You can also search for this author inPubMed Google Scholar * J. Ingels View author publications You can also search for this author inPubMed Google Scholar

RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Arijs, E., Nevejans, D. & Ingels, J. Unambiguous mass determination of major stratospheric positive

ions. _Nature_ 288, 684–686 (1980). https://doi.org/10.1038/288684a0 Download citation * Received: 26 August 1980 * Accepted: 27 October 1980 * Issue Date: 18 December 1980 * DOI:

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