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Neutral long-lived collision complex production in e- impact ionization of H2 and D2 molecules: influence of collective effects
No full textIon kinetic energy distributions and cross sections for the electron impact ionization of ethyl tert-butyl ether.
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Reactive pulsed laser ablation of third group elements in ammonia atmosphere: nitride thin film production
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A mass spectrometric study of gasoline anti-knocking additives Part I: electron impact ionization and fragmentation processes of MTBE
No full textMethyl tert-butyl ether (MTBE) is the most widely used additive for gasoline as it is able to increase the oxygen content and to improve the efficiency in the internal combustion engine, controlling the autoignition.
Most of the experimental studies performed on MTBE give information only on neutral particle reaction schemes, preventing a complete understanding of the oxidation and pyrolisis reaction chemistry of MTBE in extreme conditions like for example those experienced in the reactions involved in a knocking engine during the spark ignition.
In the Part I of this work electron impact ionisation of MTBE has been studied in the range 25-150 eV by means of a time of flight mass spectrometry (TOF-MS). Total ionisation cross-section for MTBE and for all the ions formed from its fragmentation are evaluated relatively to Argon cross-section. What is learned by studying processes which can be understandable within a mass spectrometer can be applied to larger more applied systems, where the extreme conditions prevent an experimental study of the ion chemistry.
In the present study the MTBE cross-sections trends and the isotopic study of deuterated MTBE (MTBE-d(3)) mass spectrum allowed to suggest reaction pathways for MTBE fragmentation.
This work will be extended to other two ether molecules, ETBE and TAME, that have been proposed in place of MTBE and the results will be described in the Part II of this paper
Reaction of Al with ammonia by pulsed laser ablation: optical analysis and mass spectrometry
No full textLaser induced syntesis of InN in NH3 atmosphere: diagnostics of intermediates and InN thin film deposition
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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