X-ray study of the rubidium salt of ADP

Nature ◽  
1976 ◽  
Vol 262 (5565) ◽  
pp. 234-236 ◽  
Author(s):  
M. A. VISWAMITRA ◽  
M. V. HOSUR ◽  
ZIPPORA SHAKKED ◽  
OLGA KENNARD
Keyword(s):  
X Ray ◽  
Rubidium Salt

Studies of vanadium(III) aqua chloro complexes and some related compounds

1972 ◽  
Vol 25 (12) ◽  
pp. 2521 ◽  
Author(s):  
LPSPW Podmore
Keyword(s):  
Magnetic Data ◽  
Structural Studies ◽  
Chloro Complexes ◽  
X Ray ◽  
Rubidium Salt ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole ◽  
First Time ◽  
Related Compounds ◽  
Complex Ion

Preparative and structural studies on several series of vanadium(111) aqua chloro complexes and related compounds are reported. Results indicate that all compounds contain vanadium(111) in pseudo-octahedral coordination. Evidence is presented from electronic, infrared, and nuclear quadrupole resonance spectra, X-ray powder diffraction, and magnetic data. The compounds of empirical formulae VX3,6H2O (X = Cl, Br), RbVCl4,6H2O, and Cs2VX5,nH2O (X = Cl, n = 4; X = Br,n = 5) are all shown to contain the green trans-[V(OH2)4X2]+ ion. For compounds of formula AI2VCl5,H2O (A = Cs, Rb, K, NH4) prior methods of preparation are reexamined and a new method of preparation is given. Physical studies confirm that these compounds contain the red complex ion [V(OH2)Cl5I2-. The salts comprise structures of two types, one for A = Cs, the other for A = K, NH4, Rb; the latter salts are isostructural with K2FeCl5,H2O. The anhydrous compounds A12VCl5 (A = Cs, Rb) are also examined and the preparation of the rubidium salt is reported for the first time. For these compounds the magnetic results are interpreted in terms of a weak antiferromagnetic interaction in a proposed polymeric structure and this is supported by other evidence. Some data are reported for VBr3 and VI3.

Solid State Transitions in Alkali Alkanoates: Diffractometric and Conductometric Measurements on Rubidium and Cesium Propanoates

1979 ◽  
Vol 34 (10) ◽  
pp. 1212-1215 ◽  
Author(s):  
G. Spinolo ◽  
A. Cingolani ◽  
M. Sanesi
Keyword(s):  
Solid State ◽  
Powder Diffraction ◽  
State Transitions ◽  
Potassium Salts ◽  
X Ray ◽  
Rubidium Salt ◽  
Suitable Temperature ◽  
Temperature Ranges ◽  
Sodium And Potassium

Abstract Conductometric measurements on solid rubidium and cesium propanoates and X-ray powder diffraction measurements on the rubidium salt have been carried out over suitable temperature ranges. The results obtained, along with the previous ones concerning the lithium, sodium and potassium salts, have been discussed in relation to possible melting mechanisms (involving various kinds of disorder, e.g., positional, orientational, conformational) active in the alkali alkanoates family.

Halogen nuclear quadrupole resonance and structural relationships in some complex halides of zinc and copper

1972 ◽  
Vol 25 (11) ◽  
pp. 2301 ◽  
Author(s):  
WJ Asker ◽  
DE Scaife ◽  
JA Watts
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
Mean Values ◽  
X Ray ◽  
Rubidium Salt ◽  
Structural Relationships ◽  
Quadrupole Resonance ◽  
The Mean ◽  
Nuclear Quadrupole

X-ray diffraction and halogen nuclear quadrupole resonance (n.q.r.) methods show that Rb3ZnBr5, (NH4)3ZnBr5, and CsZnI5 are isostructural with orthorhombic (NH4)3ZnCl5, and that Rb3ZnCl5 has the tetragonal Cs3CoCl5 structure. ZnI2,2NH3 is isomorphous with the corresponding chloride and bromide diammines. Rb2ZnBr4 and (NH4)2ZnBr4 have structures of Cs2ZnBr4 type, although the rubidium salt shows some stacking faults. In the complex chlorides 35Cl n.q.r. frequencies are grouped about 9 MHz, while the bromides have 81Br frequencies grouped around 60 MHz. The � → 3/2 transitions of 127I in the iodides are in the region of 76 MHz. The diammine compounds ZnBr2,2NH3 and ZnI2,2NH3 have frequencies close to the mean values for the ZnBr42- and ZnI42- ions respectively, but in the hydrates ZnCl2,l⅓H2O,ZnBr2,2H2O, β-KZnBr3,2H2O, and KZnI3,2H2O the halogen frequencies are increased. N.q.r. and X-ray data are also reported for the compound Cs3CuCl5, formed by quenching the melt. This compound slowly disproportionates at room temperature into Cs2CuCl4 and CsCl.

X-ray structural analysis of the rubidium salt of 1,1,3,3-tetranitroheptan-6-one

1969 ◽  
Vol 10 (3) ◽  
pp. 473-475
Author(s):  
N. V. Grigor'eva ◽  
N. V. Margolis ◽  
N. I. Shokhor ◽  
I. V. Tselinskii
Keyword(s):  
Structural Analysis ◽  
X Ray ◽  
Rubidium Salt

Space and Time Distribution of Hard X-Ray Emission in a Loop at the Beginning of a Flare

1994 ◽  
Vol 144 ◽  
pp. 275-277
Author(s):  
M. Karlický ◽  
J. C. Hénoux
Keyword(s):  
Time Distribution ◽  
Electron Bombardment ◽  
Spatial Evolution ◽  
Superthermal Electrons ◽  
Flare Loop ◽  
X Ray ◽  
Superthermal Electron ◽  
Flare Loops ◽  
Chromospheric Evaporation ◽  
Temporal And Spatial

AbstractUsing a new ID hybrid model of the electron bombardment in flare loops, we study not only the evolution of densities, plasma velocities and temperatures in the loop, but also the temporal and spatial evolution of hard X-ray emission. In the present paper a continuous bombardment by electrons isotropically accelerated at the top of flare loop with a power-law injection distribution function is considered. The computations include the effects of the return-current that reduces significantly the depth of the chromospheric layer which is evaporated. The present modelling is made with superthermal electron parameters corresponding to the classical resistivity regime for an input energy flux of superthermal electrons of 109erg cm−2s−1. It was found that due to the electron bombardment the two chromospheric evaporation waves are generated at both feet of the loop and they propagate up to the top, where they collide and cause temporary density and hard X-ray enhancements.

Some Problems in Understanding the Solar Corona

1994 ◽  
Vol 144 ◽  
pp. 1-9
Author(s):  
A. H. Gabriel
Keyword(s):  
Solar Corona ◽  
Solar Atmosphere ◽  
Theoretical Modelling ◽  
Total System ◽  
Major Advance ◽  
X Ray ◽  
Proper Perspective ◽  
Space Observations

The development of the physics of the solar atmosphere during the last 50 years has been greatly influenced by the increasing capability of observations made from space. Access to images and spectra of the hotter plasma in the UV, XUV and X-ray regions provided a major advance over the few coronal forbidden lines seen in the visible and enabled the cooler chromospheric and photospheric plasma to be seen in its proper perspective, as part of a total system. In this way space observations have stimulated new and important advances, not only in space but also in ground-based observations and theoretical modelling, so that today we find a well-balanced harmony between the three techniques.

White-Light Coronal Structures: Streamers and CMEs

1994 ◽  
Vol 144 ◽  
pp. 82
Author(s):  
E. Hildner
Keyword(s):  
Emission Line ◽  
Electron Density ◽  
White Light ◽  
Coronal Mass Ejections ◽  
X Rays ◽  
Solar Cycles ◽  
Temperature Function ◽  
X Ray ◽  
Eclipse Observations ◽  
Coronal Structures

AbstractOver the last twenty years, orbiting coronagraphs have vastly increased the amount of observational material for the whitelight corona. Spanning almost two solar cycles, and augmented by ground-based K-coronameter, emission-line, and eclipse observations, these data allow us to assess,inter alia: the typical and atypical behavior of the corona; how the corona evolves on time scales from minutes to a decade; and (in some respects) the relation between photospheric, coronal, and interplanetary features. This talk will review recent results on these three topics. A remark or two will attempt to relate the whitelight corona between 1.5 and 6 R⊙to the corona seen at lower altitudes in soft X-rays (e.g., with Yohkoh). The whitelight emission depends only on integrated electron density independent of temperature, whereas the soft X-ray emission depends upon the integral of electron density squared times a temperature function. The properties of coronal mass ejections (CMEs) will be reviewed briefly and their relationships to other solar and interplanetary phenomena will be noted.

Iron K-Line Emission from X-Ray Binaries

1988 ◽  
Vol 102 ◽  
pp. 47-50
Author(s):  
K. Masai ◽  
S. Hayakawa ◽  
F. Nagase
Keyword(s):  
Accretion Disk ◽  
Radiative Recombination ◽  
Characteristic Temperature ◽  
Line Emission ◽  
Ionization Front ◽  
Continuum Radiation ◽  
X Ray ◽  
Low Mass ◽  
X Ray Binaries

AbstractEmission mechanisms of the iron Kα-lines in X-ray binaries are discussed in relation with the characteristic temperature Txof continuum radiation thereof. The 6.7 keV line is ascribed to radiative recombination followed by cascades in a corona of ∼ 100 eV formed above the accretion disk. This mechanism is attained for Tx≲ 10 keV as observed for low mass X-ray binaries. The 6.4 keV line observed for binary X-ray pulsars with Tx> 10 keV is likely due to fluorescence outside the He II ionization front.

Diagnostics of Gold Laser Plasmas

1988 ◽  
Vol 102 ◽  
pp. 357-360
Author(s):  
J.C. Gauthier ◽  
J.P. Geindre ◽  
P. Monier ◽  
C. Chenais-Popovics ◽  
N. Tragin ◽  
...  
Keyword(s):  
Experimental Results ◽  
Pure Gold ◽  
Electronic Temperature ◽  
X Ray ◽  
Laser Plasmas ◽  
Collisional Radiative Model ◽  
Radiative Model

AbstractIn order to achieve a nickel-like X ray laser scheme we need a tool to determine the parameters which characterise the high-Z plasma. The aim of this work is to study gold laser plasmas and to compare experimental results to a collisional-radiative model which describes nickel-like ions. The electronic temperature and density are measured by the emission of an aluminium tracer. They are compared to the predictions of the nickel-like model for pure gold. The results show that the density and temperature can be estimated in a pure gold plasma.

Axial Observation of X-Ray Spectra from a Beam-Foil Source

1988 ◽  
Vol 102 ◽  
pp. 339-342
Author(s):  
J.M. Laming ◽  
J.D. Silver ◽  
R. Barnsley ◽  
J. Dunn ◽  
K.D. Evans ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
Heavy Ion ◽  
Ion Beams ◽  
Beam Axis ◽  
Doppler Broadening ◽  
X Ray ◽  
Beam Foil

AbstractNew observations of x-ray spectra from foil-excited heavy ion beams are reported. By observing the target in a direction along the beam axis, an improvement in spectral resolution, δλ/λ, by about a factor of two is achieved, due to the reduced Doppler broadening in this geometry.

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