New Kα satellites of 30Zn following electron bombardment

1980 ◽  
Vol 58 (1) ◽  
pp. 94-97 ◽  
Author(s):  
Anand N. Nigam ◽  
Sushma Kothari
Keyword(s):  
Emission Spectrum ◽  
High Frequency ◽  
Electron Bombardment ◽  
Energy Calculations ◽  
X Ray ◽  
Muscovite Mica ◽  
Mica Crystal ◽  
First Time

The α-region of the electron excited K-X-ray emission spectrum of 30Zn, registered with the help of 20 and 40 cm curved muscovite mica crystal spectrographs of the transmission (Cauchois) type, has been microphotographically investigated.Four new high frequency satellites at 1415.2, 1411.4, 1401.7, and 1408.5 xu have been observed. On the basis of Relativistic Dirac–Fock (RDF) energy calculations for different initial and final configurations, the first three have been assigned to specific transitions (1s)−1(2p)−n → (2p)−n−1, with n = 3, 4, 5, respectively. However, the fourth one has been only tentatively assigned to the transition (1s)−1(2s)−1(2p)−4 → (2s)−1(2p)−5, since RDF calculations for these configurations were not available.The presence of two other satellites, reported earlier by Edamoto, has been confirmed. These have been observed at 1428.7 and 1424.4 xu and assigned for the first time to the transitions (1s)−1(2p)−n → (2p)−n−1 with n = 1 and 2, respectively.

A new satellite in the L-X-ray emission spectrum of erbium-68

1976 ◽  
Vol 54 (21) ◽  
pp. 2193-2196 ◽  
Author(s):  
Anand N. Nigam ◽  
Rakesh B. Mathur
Keyword(s):  
Emission Spectrum ◽  
Type A ◽  
X Ray ◽  
Multiple Ionization ◽  
Mica Crystal ◽  
First Time

Using a 40 cm curved mica crystal spectrograph of the transmission (Cauchois) type, a new satellite Lα5 at λ = 1769.0 xu has been reported for the first time in the L emission spectrum of erbium. On the basis of Wentzel's multiple ionization theory, the satellite has been assigned to the transition L3M1 → M1M5. The presence of the satellites αx, β1′, β2I, and γ1′, reported by earlier workers, has been confirmed. The assignment of the transitions to these satellites by Nigam et al. has been critically examined and finally these have been assigned to the transitions L3M2 → M2M5, L2M1 → M1M4, L3M5 → M5N5, and L2M4 → M4N4 respectively.

A new satellite in the L X-ray emission spectrum of lutetium-71

1977 ◽  
Vol 55 (16) ◽  
pp. 1385-1386 ◽  
Author(s):  
Anand N. Nigam ◽  
Rakesh B. Mathur
Keyword(s):  
Emission Spectrum ◽  
Type A ◽  
X Ray ◽  
Multiple Ionization ◽  
Mica Crystal ◽  
First Time

Using a 40 cm curved mica crystal spectrograph of the transmission (Cauchois) type, a new satellite β14 has been observed at λ = 1408.3 X unit (Xu) in the L X-ray emission spectrum of lutetium-71 for the first time. On the basis of Wentzel's multiple ionization theory the new satellite has been assigned to the transition L2M4 → M4M4. Further, the presence of the satellites αx, β21, and γ1′ in the spectrum of lutetium reported by earlier workers, has been confirmed and these satellites have been assigned to the transitions L3M2 → M2M5, L3M5 → M5N5, and L2M4 → M4N4, respectively.

New X-ray diagram lines in the L spectrum of 65Tb

1969 ◽  
Vol 47 (3) ◽  
pp. 341-343 ◽  
Author(s):  
G. B. Deodhar ◽  
P. P. Varma ◽  
R. B. Singh
Keyword(s):  
Emission Spectrum ◽  
X Ray ◽  
First Time

Investigating the L emission spectrum of terbium 65 experimentally, the existence of the quadrupole lines λλ1711.99, 1552.87 x.u. corresponding to the transitions LIIINIII and LIINIII respectively, the nonquadrupole line λ1427.12 x.u. corresponding to the transition LIIMV and the octupole line λ1765.13 x.u. due to the transition LIIMV has been established for the first time. Also, the dipole lines LIIOI (γ8), LIIOIV (γ6), and LIIIOIV,V(β5) and the quadrupole line due to the transition LIOIV,V reported so far only by Sakellaridis have been confirmed. However, the line LIIMI(η) also reported by Sakellaridis could not be confirmed.

Performance of a reflection-type polarizer by use of muscovite mica crystal in the soft x-ray region of 1keV

2005 ◽  
Vol 76 (2) ◽  
pp. 023104 ◽  
Author(s):  
Takashi Imazono ◽  
Masahiko Ishino ◽  
Masato Koike ◽  
Hiroaki Kimura ◽  
Toko Hirono ◽  
...  
Keyword(s):  
X Ray ◽  
Muscovite Mica ◽  
Mica Crystal

New lines in the L-spectrum of neodymium-60

1977 ◽  
Vol 55 (17) ◽  
pp. 1521-1525 ◽  
Author(s):  
B. D. Shrivastava ◽  
R. K. Jain ◽  
V. S. Dubey
Keyword(s):  
Emission Spectrum ◽  
High Frequency ◽  
Quadrupole Transition ◽  
X Ray ◽  
The Third ◽  
Forbidden Transition

Using a focusing X-ray spectrograph of Cauchois type, three new lines at 1737.2, 2280.9, and 2354.9 X unit (Xu) have been observed in the L-emission spectrum of neodymium-60. The first two lines have been ascribed to the forbidden transition LI,NVI, VII and quadrupole transition LIIMIII (β17), respectively. The third one has been identified as the high frequency satellite Lαx. The existence of three quadrupole lines LINIV, V (γII), LIINVI, VII (γ8′), and LIIINVI, VII (β7′), only reported by Gokhale and Shukla, has been confirmed. The measurements of previously known diagram lines have been compared with those of earlier workers.

Palladium-Cadmium Ordering In Repdcd (Re = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb) And Comparison With Isotypic Indium Compounds

2002 ◽  
Vol 57 (3) ◽  
pp. 275-279 ◽  
Author(s):  
Thomas Fickenscher ◽  
Rolf-Dieter Hoffmann ◽  
Ratikanta Mishra ◽  
Rainer Pöttgen
Keyword(s):  
Crystal Structure ◽  
High Frequency ◽  
Rare Earth Metals ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
Variable Parameters ◽  
X Ray ◽  
Trivalent Rare Earth ◽  
Indium Compounds ◽  
First Time

AbstractTernary intermetallic compoundsREPdCd (RE=La, Ce, Pr, Nd, Sm, Eu, Tb)were synthesized by reaction of the elements in sealed tantalum tubes in a high-frequency furnace. All compounds were investigated by X-ray diffraction on powders. Those with RE = La, Ce, Pr, Nd, Sm, and Tb contain trivalent rare earth metals and they crystallize with the hexagonal ZrNiAl type structure. NdPdCd [a = 764.8(3), c = 401.3(2) pm] and TbPdCd [a = 756.5(2), c = 389.0(1) pm] are reported here for the first time as well as EuPdCd. The compounds with La, Ce, Pr, and Sm [J. Alloys Compd. 182, 87 (1992)] are confirmed. The crystal structure of EuPdCd was refined from X-ray single crystal diffractometer data: TiNiSi type, Pnma, a = 745.9(3), b = 439.8(2), c = 863.7(3) pm, wR2 = 0.0405, 683 F2 values, and 20 variable parameters. The three-dimensional [PdCd] substructure consists of strongly puckered, orthorhombically distorted Pd3Cd3 hexagons with Pd-Cd distances ranging from 283 to 285 pm. The europium atoms fill the cavities within the [PdCd] network. Chemical bonding in the series REPdCd and REPdIn is compared.

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.

The Microstructure of Steatite (Protoenstatite)

1985 ◽  
Vol 43 ◽  
pp. 236-237
Author(s):  
W. E. Lee ◽  
A. H. Heuer
Keyword(s):  
High Frequency ◽  
Glass Ceramics ◽  
Magnesium Silicate ◽  
Beam Current ◽  
Glassy Matrix ◽  
Angle Of Incidence ◽  
X Ray ◽  
Mechanical And Electrical Properties ◽  
Argon Ions ◽  
High Temperature Polymorph

IntroductionTraditional steatite ceramics, made by firing (vitrifying) hydrous magnesium silicate, have long been used as insulators for high frequency applications due to their excellent mechanical and electrical properties. Early x-ray and optical analysis of steatites showed that they were composed largely of protoenstatite (MgSiO3) in a glassy matrix. Recent studies of enstatite-containing glass ceramics have revived interest in the polymorphism of enstatite. Three polymorphs exist, two with orthorhombic and one with monoclinic symmetry (ortho, proto and clino enstatite, respectively). Steatite ceramics are of particular interest a they contain the normally unstable high-temperature polymorph, protoenstatite.Experimental3mm diameter discs cut from steatite rods (∼10” long and 0.5” dia.) were ground, polished, dimpled, and ion-thinned to electron transparency using 6KV Argon ions at a beam current of 1 x 10-3 A and a 12° angle of incidence. The discs were coated with carbon prior to TEM examination to minimize charging effects.

Diphosphinoazine Rhodium(I) and Iridium(I) Complexes

2006 ◽  
Vol 71 (2) ◽  
pp. 197-206 ◽  
Author(s):  
Martin Pošta ◽  
Jan Čermák ◽  
Pavel Vojtíšek ◽  
Ivana Císařová
Keyword(s):  
Rhodium Complexes ◽  
Iridium Complexes ◽  
X Ray ◽  
First Time

The first rhodium complexes of diphosphinoazines [{RhCl(1,2-η:5,6-η-CH=CHCH2CH2CH=CHCH2CH2)}2 {μ-R2PCH2C(But)=NN=C(But)CH2PR2] (R = Ph, Cy, Pri) were prepared by cleavage of the bridge in chloro(cycloocta-1,5-diene)rhodium(I) dimer, the analogous iridium(I) complexes were also prepared for the first time. The X-ray structures of isostructural rhodium and iridium complexes with bis(dicyclohexylphosphino)pinacoloneazine were determined. Diphosphinoazine ligands in the complexes remained in (Z,Z) configuration bridging two RhCl(C8H12) units.

Sign in / Sign up

Export Citation Format

Share Document