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.

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.

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.

scholarly journals Quartz Crystallite Size and Moganite Content as Indicators of the Mineralogical Maturity of the Carboniferous Chert: The Case of Cherts from Eastern Asturias (Spain)

Minerals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 611
Author(s):  
Celia Marcos ◽  
María de Uribe-Zorita ◽  
Pedro Álvarez-Lloret ◽  
Alaa Adawy ◽  
Patricia Fernández ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Crystallite Size ◽  
Archaeological Sites ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Infrared And Raman Spectroscopy ◽  
First Time ◽  
Geological Formations

Chert samples from different coastal and inland outcrops in the Eastern Asturias (Spain) were mineralogically investigated for the first time for archaeological purposes. X-ray diffraction, X-ray fluorescence, transmission electron microscopy, infrared and Raman spectroscopy and total organic carbon techniques were used. The low content of moganite, since its detection by X-ray diffraction is practically imperceptible, and the crystallite size (over 1000 Å) of the quartz in these cherts would be indicative of its maturity and could potentially be used for dating chert-tools recovered from archaeological sites. Also, this information can constitute essential data to differentiate the cherts and compare them with those used in archaeological tools. However, neither composition nor crystallite size would allow distinguishing between coastal and inland chert outcrops belonging to the same geological formations.

scholarly journals First Report on the Geologic Occurrence of Natural Na–A Zeolite and Associated Minerals in Cretaceous Mudstones of the Paja Formation of Vélez (Santander), Colombia

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 218
Author(s):  
Carlos Alberto Ríos-Reyes ◽  
German Alfonso Reyes-Mendoza ◽  
José Antonio Henao-Martínez ◽  
Craig Williams ◽  
Alan Dyer
Keyword(s):  
Natural Zeolite ◽  
Scanning Electron Micrographs ◽  
Total Sulfur ◽  
Zeolite A ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mineral Phases ◽  
The World ◽  
Porosity And Permeability ◽  
First Time

This study reports for the first time the geologic occurrence of natural zeolite A and associated minerals in mudstones from the Cretaceous Paja Formation in the urban area of the municipality of Vélez (Santander), Colombia. These rocks are mainly composed of quartz, muscovite, pyrophyllite, kaolinite and chlorite group minerals, framboidal and cubic pyrite, as well as marcasite, with minor feldspar, sulphates, and phosphates. Total organic carbon (TOC), total sulfur (TS), and millimeter fragments of algae are high, whereas few centimeters and not biodiverse small ammonite fossils, and other allochemical components are subordinated. Na–A zeolite and associated mineral phases as sodalite occur just beside the interparticle micropores (honeycomb from framboidal, cube molds, and amorphous cavities). It is facilitated by petrophysical properties alterations, due to processes of high diagenesis, temperatures up to 80–100 °C, with weathering contributions, which increase the porosity and permeability, as well as the transmissivity (fluid flow), allowing the geochemistry remobilization and/or recrystallization of pre-existing silica, muscovite, kaolinite minerals group, salts, carbonates, oxides and peroxides. X-ray diffraction analyses reveal the mineral composition of the mudstones and scanning electron micrographs show the typical cubic morphology of Na–A zeolite of approximately 0.45 mμ in particle size. Our data show that the sequence of the transformation of phases is: Poorly crystalline aluminosilicate → sodalite → Na–A zeolite. A literature review shows that this is an unusual example of the occurrence of natural zeolites in sedimentary marine rocks recognized around the world.

scholarly journals The Effect of Surfactant-Modified Montmorillonite on the Cross-Linking Efficiency of Polysiloxanes

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2623
Author(s):  
Monika Wójcik-Bania ◽  
Jakub Matusik
Keyword(s):  
Total Pore Volume ◽  
Cross Linking ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
The Cross ◽  
Chain Lengths ◽  
First Time ◽  
Substituent Influence ◽  
Benzyl Substituent

Polymer–clay mineral composites are an important class of materials with various applications in the industry. Despite interesting properties of polysiloxanes, such matrices were rarely used in combination with clay minerals. Thus, for the first time, a systematic study was designed to investigate the cross-linking efficiency of polysiloxane networks in the presence of 2 wt % of organo-montmorillonite. Montmorillonite (Mt) was intercalated with six quaternary ammonium salts of the cation structure [(CH3)2R’NR]+, where R = C12, C14, C16, and R’ = methyl or benzyl substituent. The intercalation efficiency was examined by X-ray diffraction, CHN elemental analysis, and Fourier transform infrared (FTIR) spectroscopy. Textural studies have shown that the application of freezing in liquid nitrogen and freeze-drying after the intercalation increases the specific surface area and the total pore volume of organo-Mt. The polymer matrix was a poly(methylhydrosiloxane) cross-linked with two linear vinylsiloxanes of different siloxane chain lengths between end functional groups. X-ray diffraction and transmission electron microscopy studies have shown that the increase in d-spacing of organo-Mt and the benzyl substituent influence the degree of nanofillers’ exfoliation in the nanocomposites. The increase in the degree of organo-Mt exfoliation reduces the efficiency of hydrosilylation reaction monitored by FTIR. This was due to physical hindrance induced by exfoliated Mt particles.

scholarly journals Homopiperazine (Hexahydro-1,4-diazepine)

Molbank ◽  
10.3390/m1200 ◽  
2021 ◽  
Vol 2021 (2) ◽  
pp. M1200
Author(s):  
R. Alan Aitken ◽  
Dheirya K. Sonecha ◽  
Alexandra M. Z. Slawin
Keyword(s):  
13C Nmr ◽  
Title Compound ◽  
Coupling Constants ◽  
15N Nmr ◽  
Time Data ◽  
Nmr Spectrum ◽  
X Ray ◽  
First Time

The X-ray structure of the title compound has been determined for the first time. Data on its 1H–13C-NMR coupling constants and 15N-NMR spectrum are also given.

Relationship between Hydrogen-Bonding Motifs and the 1b1 Splitting in the X-ray Emission Spectrum of Liquid Water

2021 ◽  
Vol 12 (16) ◽  
pp. 3996-4002
Author(s):  
Vinícius Wilian D. Cruzeiro ◽  
Andrew Wildman ◽  
Xiaosong Li ◽  
Francesco Paesani
Keyword(s):  
Hydrogen Bonding ◽  
Emission Spectrum ◽  
Liquid Water ◽  
X Ray
Sign in / Sign up

Export Citation Format

Share Document