Radial electron density distribution in plasma flow in a coaxial hall accelerator

1989 ◽  
Vol 57 (3) ◽  
pp. 1109-1112
Author(s):  
I. A. Anoshko ◽  
V. S. Ermachenko ◽  
M. N. Rolin ◽  
V. G. Sevast'yanenko ◽  
L. E. Sandrigailo
Keyword(s):  
Density Distribution ◽  
Electron Density ◽  
Plasma Flow ◽  
Electron Density Distribution ◽  
Radial Electron Density Distribution

9.16. A sub-parsec accretion disk in NGC 4261

1998 ◽  
Vol 184 ◽  
pp. 413-414
Author(s):  
D.L. Jones ◽  
A.E. Wehrle
Keyword(s):  
Density Distribution ◽  
Radio Source ◽  
Electron Density ◽  
Accretion Disk ◽  
Electron Density Distribution ◽  
Angular Resolution ◽  
Absorption Feature ◽  
Nuclear Region ◽  
Narrow Gap ◽  
Radial Electron Density Distribution

We observed the nuclear region of NGC 4261 (3C270) with the VLBA to determine the morphology of the central radio source on parsec scales. Our highest angular resolution image at 8.4 GHz shows a very narrow gap in emission just east of the radio core (on the counterjet side), which we interpret as an absorption feature caused by a small, dense inner accretion disk whose width is less than 0.1 parsec. If the inclination of this inner disk is close to that of the much larger-scale disk imaged by HST, it becomes optically thin to 8.4 GHz radiation at a deprojected radius of about 0.8 pc. September 1997 VLBA observations at higher frequencies should allow us to determine the radial electron density distribution of the inner disk.

A contribution of radial electron density distribution measurements to the study of PTFE-Carbon

Carbon ◽  
1981 ◽  
Vol 19 (6) ◽  
pp. 413-419 ◽  
Author(s):  
L. Červinka ◽  
F.P. Dousek ◽  
J. Jansta ◽  
H.G. Neumann ◽  
H. Steil
Keyword(s):  
Density Distribution ◽  
Electron Density ◽  
Electron Density Distribution ◽  
Radial Electron Density Distribution

A study on α-RuCl3 crystal structure by scanning tunneling microscopy

1989 ◽  
Vol 47 ◽  
pp. 30-31
Author(s):  
H.-J. Cantow ◽  
H. Hillebrecht ◽  
S. Magonov ◽  
H. W. Rotter ◽  
G. Thiele
Keyword(s):  
Crystal Structure ◽  
Density Distribution ◽  
Scanning Tunneling Microscopy ◽  
Electron Density ◽  
Structure Determination ◽  
Electron Density Distribution ◽  
Scanning Tunneling ◽  
Monoclinic Space Group ◽  
Tunneling Microscopy ◽  
X Ray

From X-ray analysis, the conclusions are drawn from averaged molecular informations. Thus, limitations are caused when analyzing systems whose symmetry is reduced due to interatomic interactions. In contrast, scanning tunneling microscopy (STM) directly images atomic scale surface electron density distribution, with a resolution up to fractions of Angstrom units. The crucial point is the correlation between the electron density distribution and the localization of individual atoms, which is reasonable in many cases. Thus, the use of STM images for crystal structure determination may be permitted. We tried to apply RuCl3 - a layered material with semiconductive properties - for such STM studies. From the X-ray analysis it has been assumed that α-form of this compound crystallizes in the monoclinic space group C2/m (AICI3 type). The chlorine atoms form an almost undistorted cubic closed package while Ru occupies 2/3 of the octahedral holes in every second layer building up a plane hexagon net (graphite net). Idealizing the arrangement of the chlorines a hexagonal symmetry would be expected. X-ray structure determination of isotypic compounds e.g. IrBr3 leads only to averaged positions of the metal atoms as there exist extended stacking faults of the metal layers.

Sign in / Sign up

Export Citation Format

Share Document