Phosphorescence of the trans-stilbene single crystal

1985 ◽  
Vol 89 (25) ◽  
pp. 5332-5333 ◽  
Author(s):  
Takeshi Ikeyama ◽  
Tohru Azumi
Keyword(s):  
Single Crystal ◽  
Trans Stilbene

Electron momentum distribution mapping of trans-stilbene single crystal by positron annihilation

2005 ◽  
Vol 412 (4-6) ◽  
pp. 327-330 ◽  
Author(s):  
Krishnan Sivaji ◽  
Arjunan Arulchakkaravarthi ◽  
Sellaiyan Selvakumar ◽  
Perumalsamy Ramasamy ◽  
Sambasivam Sankar ◽  
...  
Keyword(s):  
Single Crystal ◽  
Positron Annihilation ◽  
Momentum Distribution ◽  
Electron Momentum ◽  
Electron Momentum Distribution ◽  
Trans Stilbene ◽  
Distribution Mapping

A positron annihilation study on phase transitions in trans-stilbene single crystal

1995 ◽  
Vol 200 (3) ◽  
pp. 265-275 ◽  
Author(s):  
M. Bokor ◽  
T. Marek ◽  
K. Süvegh ◽  
I. Konkoly Theqe ◽  
A. Vértes
Keyword(s):  
Phase Transitions ◽  
Single Crystal ◽  
Positron Annihilation ◽  
Trans Stilbene ◽  
In Trans ◽  
Positron Annihilation Study

Growth of organic molecular single crystal trans-stilbene by selective self seeding from vertical Bridgman technique

2002 ◽  
Vol 234 (1) ◽  
pp. 159-163 ◽  
Author(s):  
A. Arulchakkaravarthi ◽  
P. Jayavel ◽  
P. Santhanaraghavan ◽  
P. Ramasamy
Keyword(s):  
Single Crystal ◽  
Bridgman Technique ◽  
Trans Stilbene ◽  
Vertical Bridgman

A Preparation of High Resolution Standards for Electron Microscopy. Part II

1971 ◽  
Vol 29 ◽  
pp. 160-161
Author(s):  
Akira Tanaka ◽  
David F. Harling
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Carbon Black ◽  
Single Crystal ◽  
Dark Field ◽  
Graphitized Carbon Black ◽  
Graphitized Carbon ◽  
Dark Field Imaging ◽  
Crystal Films ◽  
Micro Holes

In the previous paper, the author reported on a technique for preparing vapor-deposited single crystal films as high resolution standards for electron microscopy. The present paper is intended to describe the preparation of several high resolution standards for dark field microscopy and also to mention some results obtained from these studies. Three preparations were used initially: 1.) Graphitized carbon black, 2.) Epitaxially grown particles of different metals prepared by vapor deposition, and 3.) Particles grown epitaxially on the edge of micro-holes formed in a gold single crystal film.The authors successfully obtained dark field micrographs demonstrating the 3.4Å lattice spacing of graphitized carbon black and the Au single crystal (111) lattice of 2.35Å. The latter spacing is especially suitable for dark field imaging because of its preparation, as in 3.), above. After the deposited film of Au (001) orientation is prepared at 400°C the substrate temperature is raised, resulting in the formation of many square micro-holes caused by partial evaporation of the Au film.

Structure of Palladium Single-Crystal Films Prepared by Flash Evaporation onto (001) NaCl Substrates

1970 ◽  
Vol 28 ◽  
pp. 456-457
Author(s):  
L. E. Murr ◽  
G. Wong
Keyword(s):  
Single Crystal ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
High Rate ◽  
Flash Evaporation ◽  
Optimum Load ◽  
Single Crystal Films ◽  
Crystal Films ◽  
A Current

Palladium single-crystal films have been prepared by Matthews in ultra-high vacuum by evaporation onto (001) NaCl substrates cleaved in-situ, and maintained at ∼ 350° C. Murr has also produced large-grained and single-crystal Pd films by high-rate evaporation onto (001) NaCl air-cleaved substrates at 350°C. In the present work, very large (∼ 3cm2), continuous single-crystal films of Pd have been prepared by flash evaporation onto air-cleaved (001) NaCl substrates at temperatures at or below 250°C. Evaporation rates estimated to be ≧ 2000 Å/sec, were obtained by effectively short-circuiting 1 mil tungsten evaporation boats in a self-regulating system which maintained an optimum load current of approximately 90 amperes; corresponding to a current density through the boat of ∼ 4 × 104 amperes/cm2.

Dislocations, Ordering and Antiferromagnetic Domains in MnO

1970 ◽  
Vol 28 ◽  
pp. 522-523
Author(s):  
D. J. Barber ◽  
R. G. Evans
Keyword(s):  
Electron Diffraction ◽  
Single Crystal ◽  
Optical Microscopy ◽  
Defect Chemistry ◽  
Magnetic Structures ◽  
Optically Transparent ◽  
Magnetic Features ◽  
Antiferromagnetic Domains

Manganese (II) oxide, MnO, in common with CoO, NiO and FeO, possesses the NaCl structure and shows antiferromagnetism below its Neel point, Tn∼ 122 K. However, the defect chemistry of the four oxides is different and the magnetic structures are not identical. The non-stoichiometry in MnO2 small (∼2%) and below the Tn the spins lie in (111) planes. Previous work reported observations of magnetic features in CoO and NiO. The aim of our work was to find explanations for certain resonance results on antiferromagnetic MnO.Foils of single crystal MnO were prepared from shaped discs by dissolution in a mixture of HCl and HNO3. Optical microscopy revealed that the etch-pitted foils contained cruciform-shaped precipitates, often thick and proud of the surface but red-colored when optically transparent (MnO is green). Electron diffraction and probe microanalysis indicated that the precipitates were Mn2O3, in contrast with recent findings of Co3O4 in CoO.

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