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See detailHow complex can be the Unimolecular Decomposition of a simple Molecule? The case of Acetylene. An Electron Impact and PIPECO Investigation.
Locht, Robert ULg; Servais, Christian ULg

in Zeitschrift für Physikalische Chemie (1996), 195

The dissociative ionization of C2H2, C2D2 and C2HD is presented in this work. Excepting the H2+ formation, all dissociation channels are thoroughly investigated by electron impact. The translational ... [more ▼]

The dissociative ionization of C2H2, C2D2 and C2HD is presented in this work. Excepting the H2+ formation, all dissociation channels are thoroughly investigated by electron impact. The translational energy distribution as a function of the impinging electron energy and the appearance energy as a function of the translational energy are measured for all fragment ions. KE versus AE diagrams are obtained and the isotope effect is examined. All observed thresholds are analyzed in detail and dissociation mechanisms are proposed. For the C2H+ ion the PIPECO technique has also been used. From these discussions the H-C2H, HC-CH and H-C2 binding energy values are proposed, i.e. 5.33+/-0.23 eV, 9.83+/0.10 eV and 5.44+/-0.40 eV respectively. The fragmentation path leading to C+, CH2+ and C2+ are discussed in terms of dissociation mechanisms involving the transient vinylidene structure of the molecular ion as an intermediate. [less ▲]

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See detailÜber die physikalischen Veränderungen die gewisse Schwefelverbinungen unter dem Einfluss der Temperatur erleiden
Spring, Walthère ULg

in Zeitschrift für Physikalische Chemie (1895), 18

Spring, W. Zeitschrift fuer Physikalische Chemie, Stoechiometrie und Verwandtschaftslehre (1895), 18, 553-8; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July ... [more ▼]

Spring, W. Zeitschrift fuer Physikalische Chemie, Stoechiometrie und Verwandtschaftslehre (1895), 18, 553-8; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). Experiments analogous to those undertaken with metals (Abstr., 1895, ii, 37) were made on the sulphides of silver, arsenic, antimony, bismuth, copper, tin, cadmium, lead, and zinc. The amorphous sulphides obtained by precipitation were used, being first washed, dried, and lightly pressed into cylinders. The latter treatment was merely to bring the particles into contact, the pressure being so slight that the cylinders could be easily crumbled between the fingers. One half of the cylinder was kept for comparison, the other enclosed in an exhausted glass tube and exposed for nine days of 7-8 hours to a temperature of 265° (150° for the arsenic sulphide). The cylinder of silver sulphide, after this treatment, was steel grey, with a metallic lustre, and with crystal faces visible on the surface. It could not be broken by the hand, and, after forcible breaking, exhibited a crystalline fracture resembling that of steel. Similar results were also obtained with the other compounds. Uncompressed powders were also employed, which formed compact masses, with, usually, indications of a crystalline nature. The author points out the probable importance of these results in geology, as they indicate the possible formation of crystalline rocks, etc., without fusion or the aid of a solvent. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

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See detailÜber das Vorkommen gewisser für den Flüssigkeits- oder Gaszustand charakteristichen Eigenschaften bei festen Metallen
Spring, Walthère ULg

in Zeitschrift für Physikalische Chemie (1893), XV

Spring, W. Zeitschrift fuer Physikalische Chemie, Stoechiometrie und Verwandtschaftslehre (1894), 15, 65-78; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July ... [more ▼]

Spring, W. Zeitschrift fuer Physikalische Chemie, Stoechiometrie und Verwandtschaftslehre (1894), 15, 65-78; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). Many metals, when heated to temperatures considerably below their melting points, exhibit properties characteristic of the liquid state. For examination in this respect, the metals were turned into cylinders with ends as perfectly plane as possible, and placed end to end in an iron holder, pressure being applied by a screw. They were heated in this condition in a hot air bath, filled, if necessary, with an indifferent gas. Cylinders of aluminium, bismuth, cadmium, copper, tin, gold, lead, zinc, antimony, and platinum were employed, and in the first experiment two cylinders of the same metal were used. The temperature was kept for from 4 to 8 hours at from 200° to 400°, and it was found that, except in the case of antimony and platinum, the cylinders had alloyed so perfectly that they could be turned with one end fixed in a lathe, whilst if broken in a vice the fracture did not take place along the original surface of separation. Pairs of different metals were next employed, usually copper or lead with some of the other metals, with the result that, at the junction, an alloy of considerable thickness was formed, 18 mm. in the case of zinc and copper, and 15 mm. in the case of cadmium and copper. In the case of lead and tin, a cavity in the end of one metal was filled with mica, so that contact only took place at the edge. An alloy was formed to the thickness of 15 mm., of which 9 mm. were in the tin and 6 mm. in the lead. By the use of cylinders of copper and zinc, in which, owing to a central cavity, contact only took place at the edges, it was found that the surface of the copper above the cavity was coloured by a yellow alloy resembling that formed when copper is subjected to the action of zinc vapour, and which was not due to diffusion from the edges (see also Abstracts, 1893, ii, 168). For the explanation of these results, which are most marked with soft and non-crystalline metals, the author points out the assumption suffices, that the molecules of solids, like those of fluids, do not all move with the same velocity. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

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See detailÜber eine Zunahme chemischer Energie an der freien Oberfläche flüssiger Körper : Vorläufige Mitteilung
Spring, Walthère ULg

in Zeitschrift für Physikalische Chemie (1889), 3

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See detailÜber die Reaktionsgeschwindigkeit zwischen isländischem Doppelspat und einigen Säuren
Spring, Walthère ULg

in Zeitschrift für Physikalische Chemie (1888), 2

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See detailÜber die Chemische Einwirkung der Körper im festen Zustande
Spring, Walthère ULg

in Zeitschrift für Physikalische Chemie (1888), 2

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See detailÜber die Kompression von fauchtem Pulver fester Körper und die Formbildung der Gesteine
Spring, Walthère ULg

in Zeitschrift für Physikalische Chemie (1888), 2

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See detailÜber den Einfluss der Temperatur auf die Geschwindigkeit der Einwirkung der Mineralsäuren auf Marmor
Spring, Walthère ULg

in Zeitschrift für Physikalische Chemie (1887), 1

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See detailÜber einen Fall durch Druck bewirkter chemischer Zersetzung
Spring, Walthère ULg; Van't Hoff

in Zeitschrift für Physikalische Chemie (1887), 1

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