scholarly journals Observation of stable HO4+ and DO4+ ions from ion–molecule reactions in helium nanodroplets

2016 ◽  
Vol 18 (19) ◽  
pp. 13169-13172 ◽  
Author(s):  
Michael Renzler ◽  
Stefan Ralser ◽  
Lorenz Kranabetter ◽  
Erik Barwa ◽  
Paul Scheier ◽  
...  
Keyword(s):  
Experimental Observation ◽  
Helium Nanodroplets ◽  
Ion Molecule Reactions ◽  
Enhanced Stability ◽  
Made In

Experimental observation of the enhanced stability of the HO4+ ion has been made in a study using helium nanodroplets.

Ion-Molecule Reactions in Helium Nanodroplets Doped with C60and Water Clusters

2009 ◽  
Vol 48 (47) ◽  
pp. 8940-8943 ◽  
Author(s):  
Stephan Denifl ◽  
Fabio Zappa ◽  
Ingo Mähr ◽  
Filipe Ferreira da Silva ◽  
Abid Aleem ◽  
...  
Keyword(s):  
Water Clusters ◽  
Helium Nanodroplets ◽  
Ion Molecule Reactions

Ion-Molecule Reactions in Helium Nanodroplets Doped with C60and Water Clusters

2009 ◽  
Vol 121 (47) ◽  
pp. 9102-9105 ◽  
Author(s):  
Stephan Denifl ◽  
Fabio Zappa ◽  
Ingo Mähr ◽  
Filipe Ferreira da Silva ◽  
Abid Aleem ◽  
...  
Keyword(s):  
Water Clusters ◽  
Helium Nanodroplets ◽  
Ion Molecule Reactions

Ion−Molecule Reactions and Fragmentation Patterns in Helium Nanodroplets†

2007 ◽  
Vol 111 (31) ◽  
pp. 7481-7488 ◽  
Author(s):  
Adrian Boatwright ◽  
Jay Jeffs ◽  
Anthony J. Stace
Keyword(s):  
Helium Nanodroplets ◽  
Ion Molecule Reactions ◽  
Fragmentation Patterns

Reactions of thermal energy ions. VI. Hydrogen-transfer ion–molecule reactions involving polar molecules

1967 ◽  
Vol 45 (24) ◽  
pp. 3107-3117 ◽  
Author(s):  
S. K. Gupta ◽  
E. G. Jones ◽  
A. G. Harrison ◽  
J. J. Myher
Keyword(s):  
Mass Spectrometer ◽  
Thermal Energy ◽  
Pressure Measurement ◽  
Rate Constants ◽  
Hydrogen Transfer ◽  
Collision Theory ◽  
Protonated Molecule ◽  
Ion Molecule Reactions ◽  
Dipole Interactions ◽  
Made In

The rate constants for formation of the protonated molecule by ion–molecule reactions in CH3OH, (CH3)2O, and CH4 have been studied both at thermal energies and at 3.4 eV ion exit energy with a new mass spectrometer described in the present work. The rate constants are found to be approximately a factor of two greater than previously measured and it is concluded that an error in pressure measurement was made in the earlier work. Revised rate constants are presented for a number of systems studied previously. The results are compared with predictions of the collision theory modified in this paper to include the effect of ion-dipole interactions.

About cardiospasm

1930 ◽  
Vol 26 (10) ◽  
pp. 1054-1054
Author(s):  
W. Rieder
Keyword(s):  
Experimental Observation ◽  
Typical Picture ◽  
Made In

Abstracts. Surgery. About cardiospasm. W. Rieder (ref. Zentr. F. Chir., 1930, no. 29) made in dogs the cutting of all vagus'a fibers going to the carid'n and precordial part. He received a typical picture of cardiospasm. After 2 months, the disorder from emptying disappeared, as the ganglia of the lower part of the esophageal tube functioned autonomously. Based on experimental observation and in one case on a patient with cardiospasm, after cutting the vagus fibers, the author proposes to refrain from this method of operation.

Spectrophotometric measurements of objective-prism spectra

1966 ◽  
Vol 24 ◽  
pp. 118-119
Author(s):  
Th. Schmidt-Kaler
Keyword(s):  
Progress Report ◽  
Two Dimensional ◽  
Objective Prism ◽  
Made In

I should like to give you a very condensed progress report on some spectrophotometric measurements of objective-prism spectra made in collaboration with H. Leicher at Bonn. The procedure used is almost completely automatic. The measurements are made with the help of a semi-automatic fully digitized registering microphotometer constructed by Hög-Hamburg. The reductions are carried out with the aid of a number of interconnected programmes written for the computer IBM 7090, beginning with the output of the photometer in the form of punched cards and ending with the printing-out of the final two-dimensional classifications.

Surface Structure in Microtomed Sections Caused by Glass and Diamond Knives

1971 ◽  
Vol 29 ◽  
pp. 456-457
Author(s):  
J. Temple Black ◽  
William G. Boldosser
Keyword(s):  
Plastic Deformation ◽  
Epoxy Resin ◽  
Carbon Coating ◽  
Surface Damage ◽  
Body Angle ◽  
Normal Manner ◽  
Bottom Side ◽  
Cutting Direction ◽  
Made In ◽  
Diamond Knife

Ultramicrotomy produces plastic deformation in the surfaces of microtomed TEM specimens which can not generally be observed unless special preparations are made. In this study, a typical biological composite of tissue (infundibular thoracic attachment) infiltrated in the normal manner with an embedding epoxy resin (Epon 812 in a 60/40 mixture) was microtomed with glass and diamond knives, both with 45 degree body angle. Sectioning was done in Portor Blum Mt-2 and Mt-1 microtomes. Sections were collected on formvar coated grids so that both the top side and the bottom side of the sections could be examined. Sections were then placed in a vacuum evaporator and self-shadowed with carbon. Some were chromium shadowed at a 30 degree angle. The sections were then examined in a Phillips 300 TEM at 60kv.Carbon coating (C) or carbon coating with chrom shadowing (C-Ch) makes in effect, single stage replicas of the surfaces of the sections and thus allows the damage in the surfaces to be observable in the TEM. Figure 1 (see key to figures) shows the bottom side of a diamond knife section, carbon self-shadowed and chrom shadowed perpendicular to the cutting direction. Very fine knife marks and surface damage can be observed.

Iron storage sites in the myocardium as revealed by cytohistochemistry

1988 ◽  
Vol 46 ◽  
pp. 394-395
Author(s):  
M. Ashraf ◽  
F. Thompson ◽  
S. Miki ◽  
P. Srivastava
Keyword(s):  
Cardiac Tissue ◽  
Coronary Perfusion ◽  
Intracellular Iron ◽  
Ether Anesthesia ◽  
Intense Staining ◽  
Iron Storage ◽  
Thin Sections ◽  
Rat Hearts ◽  
Cacodylate Buffer ◽  
Made In

Iron is believed to play an important role in the pathogenesis of ischemic injury. However, the sources of intracellular iron in myocytes are not yet defined. In this study we have attempted to localize iron at various cellular sites of the cardiac tissue with the ferrocyanide technique.Rat hearts were excised under ether anesthesia. They were fixed with coronary perfusion with 3% buffered glutaraldehyde made in 0.1 M cacodylate buffer pH 7.3. Sections, 60 μm in thickness, were cut on a vibratome and were incubated in the medium containing 500 mg of potassium ferrocyanide in 49.5 ml H2O and 0.5 ml concentrated HC1 for 30 minutes at room temperature. Following rinses in the buffer, tissues were dehydrated in ethanol and embedded in Spurr medium.The examination of thin sections revealed intense staining or reaction product in peroxisomes (Fig. 1).

Microanalysis of precipitates in a ferritic steel

1978 ◽  
Vol 36 (1) ◽  
pp. 618-619
Author(s):  
J.M. Titchmarsh
Keyword(s):  
Ferritic Steel ◽  
Particle Identification ◽  
Energy Dispersive ◽  
Objective Lens ◽  
Ferritic Steels ◽  
Replica Technique ◽  
X Ray ◽  
Large Numbers ◽  
Scanning Transmission ◽  
Made In

The advances in recent years in the microanalytical capabilities of conventional TEM's fitted with probe forming lenses allow much more detailed investigations to be made of the microstructures of complex alloys, such as ferritic steels, than have been possible previously. In particular, the identification of individual precipitate particles with dimensions of a few tens of nanometers in alloys containing high densities of several chemically and crystallographically different precipitate types is feasible. The aim of the investigation described in this paper was to establish a method which allowed individual particle identification to be made in a few seconds so that large numbers of particles could be examined in a few hours.A Philips EM400 microscope, fitted with the scanning transmission (STEM) objective lens pole-pieces and an EDAX energy dispersive X-ray analyser, was used at 120 kV with a thermal W hairpin filament. The precipitates examined were extracted using a standard C replica technique from specimens of a 2¼Cr-lMo ferritic steel in a quenched and tempered condition.

AEM investigation of ZrO2 solid solution formation in ZrO2/mullite composites

1984 ◽  
Vol 42 ◽  
pp. 408-409
Author(s):  
T. R. Dinger
Keyword(s):  
Solid Solution ◽  
Ion Beam ◽  
Analytical Electron Microscopy ◽  
Transformation Toughening ◽  
Solid Solution Formation ◽  
Solution Formation ◽  
Propagating Crack ◽  
Analytical Electron ◽  
Microcrack Toughening ◽  
Made In

Zirconia (ZrO2) is often added to ceramic compacts to increase their toughness. The mechanisms by which this toughness increase occurs are generally accepted to be those of transformation toughening and microcracking. The mechanism of transformation toughening is based on the presence of metastable tetragonal ZrO2 which transforms to the monoclinic allotrope when stressed by a propagating crack. The decrease in volume which accompanies this transformation effectively relieves the applied stress at the crack tip and toughens the material; microcrack toughening arises from the deflection of a propagating crack around sharply angular inclusions.These mechanisms, however, do not explain the toughness increases associated with the class of composites investigated here. Analytical electron microscopy (AEM) has been used to determine whether solid solution effects could be the cause of this increased toughness. Specimens of a mullite (3Al2O3·2SiO2) + 15 vol. % ZrO2 were prepared by the usual technique of mechanical thinning followed by ion beam milling. All observations were made in a Philips EM400 TEM/STEM microscope fitted with EDXS and EELS spectrometers.

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