scholarly journals The role of distonic ions in the formation of CH3NH3+ and (CH3)2NH2+ from the molecular ions of octopamine and synephrine

1990 ◽  
Vol 1 (1) ◽  
pp. 104-106 ◽  
Author(s):  
Ana M. Cardoso ◽  
Antonio J. Ferrer-Correia ◽  
Roel H. Fokkens ◽  
Nico M. M. Nibbering
Keyword(s):  
Molecular Ions ◽  
Distonic Ions

scholarly journals The role of molecular ions in cryogenic dusty plasmas of dc discharge in neon

2018 ◽  
Vol 1058 ◽  
pp. 012049
Author(s):  
V V Shumova ◽  
D N Polyakov ◽  
L M Vasilyak
Keyword(s):  
Dusty Plasmas ◽  
Molecular Ions ◽  
Dc Discharge

The role of conformational mobility in the stereospecific loss of water under electron impact

1979 ◽  
Vol 44 (12) ◽  
pp. 3595-3603 ◽  
Author(s):  
František Tureček ◽  
Vladimír Hanuš ◽  
Miloš Tichý
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Molecular Ions ◽  
Conformational Mobility ◽  
Water Elimination

Mass spectra of nine of the sixteen possible diastereoisomeric 7-hydroxytricyclo[7.3.0.02,6]dodecanes are reported. The spectra differ considerably in the extent of water elimination from molecular ions. The diastereoisomers which have conformationally flexible cis-anti-cis, cis-anti-trans and cis-syn-trans skeletons exhibit abundant (M-H2O)+. ions. Molecular ions of the rigid trans-anti-trans isomers lose water to a markedly smaller extent, the main fragmentation proceeding via a skeletal cleavage. Effects of conformational mobility are emphasized.

scholarly journals Quantification Challenges for Atom Probe Tomography of Hydrogen and Deuterium in Zircaloy-4

2019 ◽  
Vol 25 (2) ◽  
pp. 481-488 ◽  
Author(s):  
Isabelle Mouton ◽  
Andrew J. Breen ◽  
Siyang Wang ◽  
Yanhong Chang ◽  
Agnieszka Szczepaniak ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Nuclear Power ◽  
Materials Science ◽  
Atom Probe ◽  
Molecular Ions ◽  
Charge Ratio ◽  
Hydrogen Deuterium ◽  
Low Mass ◽  
Accurate Quantification

AbstractAnalysis and understanding of the role of hydrogen in metals is a significant challenge for the future of materials science, and this is a clear objective of recent work in the atom probe tomography (APT) community. Isotopic marking by deuteration has often been proposed as the preferred route to enable quantification of hydrogen by APT. Zircaloy-4 was charged electrochemically with hydrogen and deuterium under the same conditions to form large hydrides and deuterides. Our results from a Zr hydride and a Zr deuteride highlight the challenges associated with accurate quantification of hydrogen and deuterium, in particular associated with the overlap of peaks at a low mass-to-charge ratio and of hydrogen/deuterium containing molecular ions. We discuss possible ways to ensure that appropriate information is extracted from APT analysis of hydrogen in zirconium alloy systems that are important for nuclear power applications.

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