Experimental study of the proton-transfer reaction C + H2+ → CH+ + H and its isotopic variant (D2+)

2020 ◽  
Vol 22 (46) ◽  
pp. 27364-27384
Author(s):  
Pierre-Michel Hillenbrand ◽  
Kyle P. Bowen ◽  
Fabrice Dayou ◽  
Kenneth A. Miller ◽  
Nathalie de Ruette ◽  
...  
Keyword(s):  
Experimental Study ◽  
Proton Transfer ◽  
Energy Range ◽  
Cross Section ◽  
Transfer Reaction ◽  
Proton Transfer Reaction ◽  
Integral Cross Section ◽  
Translational Energy ◽  
Dual Source ◽  
Fast Beams

We report absolute integral cross section (ICS) measurements using a dual-source merged-fast-beams apparatus to study the titular reactions over the relative translational energy range of Er ∼ 0.01–10 eV.

Proton-transfer reaction in the ground state of phenol–ammonia clusters: an experimental study

1999 ◽  
Vol 310 (1-2) ◽  
pp. 173-179 ◽  
Author(s):  
S Martrenchard-Barra ◽  
C Dedonder-Lardeux ◽  
C Jouvet ◽  
D Solgadi ◽  
M Vervloet ◽  
...  
Keyword(s):  
Experimental Study ◽  
Proton Transfer ◽  
Ground State ◽  
Transfer Reaction ◽  
Proton Transfer Reaction ◽  
Ammonia Clusters

Energy dependence of ion-molecule reactions. I. Methane

1969 ◽  
Vol 22 (11) ◽  
pp. 2267 ◽  
Author(s):  
NA McAskill
Keyword(s):  
Proton Transfer ◽  
Energy Dependence ◽  
Cross Section ◽  
Mass Spectrometer ◽  
Transfer Reaction ◽  
Proton Transfer Reaction ◽  
Ion Chamber ◽  
Ion Molecule Reactions ◽  
Path Lengths ◽  
Primary Ions

The ion-molecule reactions of gaseous methane were studied at source pressures of up to 70 μ using a mass spectrometer operated without the usual source magnets. The range of ion exit energies used (0.2-1.8 eV) was obtained by using different ion path lengths as well as different field strengths. The operation of the mass spectrometer was checked by measuring the rate for the proton transfer reaction of CH4+. The energy dependence and the rate of the reactions inside the ion chamber of all the primary ions in CH4 were determined by plotting the cross section against the term, (ion exit energy)-1/2.

scholarly journals Identifying volatile in vitro biomarkers for oral bacteria with proton-transfer-reaction mass spectrometry and gas chromatography–mass spectrometry

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kajsa Roslund ◽  
Markku Lehto ◽  
Pirkko Pussinen ◽  
Kari Hartonen ◽  
Per-Henrik Groop ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Proton Transfer ◽  
Transfer Reaction ◽  
Proton Transfer Reaction ◽  
Oral Bacteria ◽  
Gas Chromatography Mass Spectrometry ◽  
Volatile Analysis ◽  
Bacterial Volatiles

AbstractWe have measured the volatile fingerprints of four pathogenic oral bacteria connected to periodontal disease and dental abscess: Porphyromonas gingivalis (three separate strains), Prevotella intermedia, Prevotella nigrescens and Tannerella forsythia. Volatile fingerprints were measured in vitro from the headspace gas of the bacteria cultured on agar. Concrete identification of new and previously reported bacterial volatiles were performed by a combination of solid phase microextraction (SPME) and offline gas chromatography–mass spectrometry (GC–MS). We also studied the effect of the reduced electric field strength (E/N) on the fragmentation patterns of bacterial volatiles in online proton-transfer-reaction time-of-flight mass spectrometry (PTR-ToF-MS). We aimed to discover possible new biomarkers for the studied oral bacteria, as well as to validate the combination of GC–MS and PTR-MS for volatile analysis. Some of the most promising compounds produced include: 1-Methyl-1,2,3,4-tetrahydroisoquinoline (1MeTIQ), indole, and a cascade of sulphur compounds, such as methanethiol, dimethyl disulphide (DMDS) and dimethyl trisulphide (DMTS). We also found that several compounds, especially alcohols, aldehydes and esters, fragment significantly with the PTR-MS method, when high E/N values are used. We conclude that the studied oral bacteria can be separated by their volatile fingerprints in vitro, which could have importance in clinical and laboratory environments. In addition, using softer ionization conditions can improve the performance of the PTR-MS method in the volatile analysis of certain compounds.

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