ArticleJournal of the American Society for Mass Spectrometry2007
Bimolecular and unimolecular contributions to the disparate self-chemical ionizations of alpha-pinene and camphene isomers.
Article in Journal of the American Society for Mass Spectrometry, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
6 citing papers in PubMed, 30 citations in OpenAlex.
- Article
- Competing noncovalent host-guest interactions and H/D exchange: reactions of benzyloxycarbonyl-proline glycine dipeptide variants with ND3.Journal of the American Society for Mass Spectrometry · 2015Article
- DNA Oligonucleotide Fragment Ion Rearrangements Upon Collision-Induced Dissociation.Journal of the American Society for Mass Spectrometry · 2015Article
- Automated deconvolution of overlapped ion mobility profiles.Journal of the American Society for Mass Spectrometry · 2014Article
- Evidence for sequence scrambling and divergent H/D exchange reactions of doubly-charged isobaric b-type fragment ions.Journal of the American Society for Mass Spectrometry · 2014Article
- H/D exchange kinetics: experimental evidence for formation of different b fragment ion conformers/isomers during the gas-phase peptide sequencing.Journal of the American Society for Mass Spectrometry · 2010Article
Corrections and comments
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Authors and funding
2 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The contributions of molecular and fragment ions toward the disparate self-chemical ionization (SCI) of alpha-pinene and camphene isomers were investigated. A kinetic model was constructed to predict the SCI outcomes for these two C(10)H(16) isomers. A major portion of the camphene molecular ions (isolated 500 ms after the 10 ms EI event at 24 eV) unimolecularly dissociated within 200 s of the ionization event. Conversely, under similar experimental conditions, the alpha-pinene molecular ions as well as the major fragment ions of alpha-pinene and camphene showed no unimolecular dissociation. The alpha-pinene and camphene molecular ions yielded product ions through two different reaction mechanisms (direct charge-transfer {CT} and indirect proton transfer {PT}). The isolated terpene fragment ions at m/z 93 and 121 reacted with their respective neutrals to produce [M + H](+). Proton affinity (PA) bracketing experiments, PA additivity schemes, and alkene PA versus adiabatic ionization energy (IE) linear correlation indicated that the PAs of camphene and alpha-pinene were comparable ( approximately 210 +/- 2 kcal x mol(-1)). The observed [M + H](+) SCI terpene ions were mainly the products of various fragment ion reactions.
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Registered trials
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