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Dissociation of Valine Cluster Cations
- Source :
- The Journal of Physical Chemistry. a
- Publication Year :
- 2020
- Publisher :
- American Chemical Society, 2020.
-
Abstract
- 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.
- Subjects :
- chemistry.chemical_classification
010304 chemical physics
Protonation
010402 general chemistry
01 natural sciences
Dissociation (chemistry)
Article
0104 chemical sciences
Ion
Amino acid
chemistry.chemical_compound
Crystallography
Monomer
chemistry
Ab initio quantum chemistry methods
0103 physical sciences
Mass spectrum
Cluster (physics)
Physical and Theoretical Chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 15205215 and 10895639
- Volume :
- 124
- Issue :
- 41
- Database :
- OpenAIRE
- Journal :
- The Journal of Physical Chemistry. a
- Accession number :
- edsair.doi.dedup.....f92098e84ec414f0c8b2d93f4fb2d23a