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Dissociation of Valine Cluster Cations
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SYSNO ASEP 0533840 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Dissociation of Valine Cluster Cations Author(s) Tiefenthaler, L. (AT)
Ončák, Milan (UFCH-W) ORCID, RID
Kollotzek, S. (AT)
Kočišek, Jaroslav (UFCH-W) RID, ORCID
Scheier, P. (AT)Source Title Journal of Physical Chemistry A. - : American Chemical Society - ISSN 1089-5639
Roč. 124, č. 41 (2020), s. 8439-8445Number of pages 7 s. Language eng - English Country US - United States Keywords Action Spectrum ; Vapor Phases ; 1-Methylcytosine Subject RIV CF - Physical ; Theoretical Chemistry OECD category Physical chemistry R&D Projects EF16_027/0008355 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UFCH-W - RVO:61388955 UT WOS 000582568300009 EID SCOPUS 85093538539 DOI 10.1021/acs.jpca.0c07208 Annotation Independently of the preparation method, for cluster cations of aliphatic amino acids, the protonated form MnH+ is always the dominant species. This is a surprising fact considering that in the gas phase, they dissociate primarily by the loss of 45 Da, i.e., the loss of the carboxylic group. In the present study, we explore the dissociation dynamics of small valine cluster cations Mn+ and their protonated counterparts MnH+ via collision-induced dissociation experiments and ab initio calculations with the aim to elucidate the formation of MnH+-type cations from amino acid clusters. For the first time, we report the preparation of valine cluster cations Mn+ in laboratory conditions, using a technique of cluster ion assembly inside He droplets. We show that the Mn+ cations cooled down to He droplet temperature can dissociate to form both Mn-1H+ and [Mn-COOH]+ ions. With increasing internal energy, the Mn-1H+ formation channel becomes dominant. Mn-1H+ ions then fragment nearly exclusively by monomer loss, describing the high abundance of protonated clusters in the mass spectra of amino acid clusters. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2021 Electronic address http://hdl.handle.net/11104/0312093
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