Cation Radical in a Single Crystal of α‐Aminoisobutyric Acid Irradiated by γ Rays at 77°K

1972 ◽  
Vol 56 (5) ◽  
pp. 2481-2482 ◽  
Author(s):  
Atsuko Minegishi ◽  
Yoshiharu Shinozaki ◽  
Gisuke Meshitsuka
Keyword(s):  
Single Crystal ◽  
Cation Radical ◽  
Aminoisobutyric Acid ◽  
Γ Rays

scholarly journals The ESR Spectrum of a π Cation Radical Trapped in a Single Crystal of Chloro(tetraphenylporphyrinato)cobalt(III)

1983 ◽  
Vol 56 (3) ◽  
pp. 822-826 ◽  
Author(s):  
Masahiro Kohno ◽  
Hiroaki Ohya-Nishiguchi ◽  
Kiyoko Yamamoto ◽  
Tosio Sakurai
Keyword(s):  
Single Crystal ◽  
Cation Radical ◽  
Esr Spectrum

Design and calibration of a source and a polarimeter for polarized 14.4 keV Mössbauer gamma rays

1980 ◽  
Vol 58 (7) ◽  
pp. 1010-1018 ◽  
Author(s):  
J. M. Daniels ◽  
H. Y. Lam ◽  
P. L. Li
Keyword(s):  
Single Crystal ◽  
Gamma Rays ◽  
Γ Rays

A source of polarized 14.4 keV Mössbauer γ rays, using a magnetized foil, and a polarizer using a single crystal of siderite, are described. The procedures for determining the polarization of the γ rays, and for calibrating and using the polarimeter, are described in detail.

A HIGH RESOLUTION FLAT CRYSTAL SPECTROMETER FOR NEUTRON CAPTURE γ-RAY STUDIES

1959 ◽  
Vol 37 (2) ◽  
pp. 203-231 ◽  
Author(s):  
J. W. Knowles
Keyword(s):  
Single Crystal ◽  
Neutron Capture ◽  
Counting Efficiency ◽  
Double Crystal ◽  
Γ Rays ◽  
Γ Ray ◽  
Antiparallel Position ◽  
Crystal Arrangement ◽  
Good Agreement ◽  
Soller Slit

A flat crystal diffraction spectrometer, constructed for the measurement of γ-rays resulting from neutron capture, is discussed both experimentally and theoretically. The spectrometer is used either as a single crystal or a double crystal instrument. In the single crystal arrangement a Laue diffracted γ-ray beam from a broad source proceeds through a Soller slit which gives it a 45-second angular divergence, to a sodium iodide scintillation detector. The energy is determined by the angle between the Soller slit and the crystal. The resolution is determined by the Soller slit, and is 4% at 1 Mev when diffracting from the (440) planes of a single germanium crystal. In the two-crystal configuration a γ-ray which is Laue diffracted from the first crystal is further diffracted from a second crystal set in the antiparallel position. The angle between the reflecting planes of the two crystals determines the γ-ray energy. The Soller slit serves only as shielding for the detector in this arrangement. The resolution depends upon the mosaics and thicknesses of the crystals; it is 0.4% at 1 Mev for diffraction from the (211) planes of two calcite crystals, each 23 mm thick and of 1.7- and 0.9-second mosaics respectively. The range of measurement extends from 80 kev to greater than 5 Mev. Where other values of γ-ray energies exist, agreement to within the expected precision, ± 0.2% is obtained. The counting efficiency as a function of energy depends on the integrated reflectivities of the crystals which may be determined at the time of a γ-ray measurement by means of the double crystal arrangement. The integrated reflectivity as a function of energy has been calculated for a number of crystals of known mosaic and throughout the range of measurement, from 0.2 to 5 Mev, good agreement is obtained.

Luminescence and Scintillation Characteristics of Gd2SiO5: Ce Single Crystal Scintillator

2016 ◽  
Vol 675-676 ◽  
pp. 772-775
Author(s):  
Nattasuda Yawai ◽  
Weerapong Chewpraditkul ◽  
Kriangkrai Wantong ◽  
Martin Nikl
Keyword(s):  
Single Crystal ◽  
Energy Resolution ◽  
Gamma Ray ◽  
Light Yield ◽  
Mass Attenuation Coefficient ◽  
Transmission Method ◽  
Light Loss ◽  
Good Energy ◽  
Γ Rays ◽  
Crystal Scintillator

The luminescence and gamma-ray detection properties of Gd2SiO5: Ce single crystal scintillator were investigated. The light yield (LY) and energy resolution were measured using R6231 photomultiplier. At 662 keV γ-rays, high LY of 10,300 photons /MeV and good energy resolution of 6.4 % were obtained. The intrinsic LY and light loss coefficient under excitation with 662 keV γ-rays were evaluated. The mass attenuation coefficient for 662 keV γ-rays was also measured by transmission method and compared with the theoretical value calculated by WinXCom program.

Radiation effect studies in single crystal of Trifluoroacetyl-α-Aminoisobutyric acid

2015 ◽  
Vol 170 (10) ◽  
pp. 854-861 ◽  
Author(s):  
M. Halim Başkan ◽  
Y. Emre Osmanoğlu ◽  
K. Sütçü ◽  
M. Aydın ◽  
Ş. Osmanoğlu
Keyword(s):  
Single Crystal ◽  
Radiation Effect ◽  
Aminoisobutyric Acid

NUCLEAR ORIENTATION OF Mn54 IN MnSiF6∙6H2O

1962 ◽  
Vol 40 (10) ◽  
pp. 1417-1422 ◽  
Author(s):  
J. M. Daniels ◽  
D. J. Griffiths
Keyword(s):  
Single Crystal ◽  
Nuclear Orientation ◽  
Trigonal Axis ◽  
Spin Hamiltonian ◽  
Temperature Range ◽  
A Value ◽  
Γ Rays

Mn54 was oriented in a single crystal of MiiSiF6∙6H2O, and the anisotropy of emission of γ-rays relative to the trigonal axis of the crystal was measured as a function of temperature in the range 0.06° K to 0.12° K. The anisotropy exhibited the expected I/T3 dependence in this temperature range. From these measurements, a value of −0.034 ± 0.005 cm−1 was deduced for the value of the constant D which occurs in the spin-Hamiltonian [Formula: see text].

scholarly journals Conformational distortions of π-cation radical (β-oxoporphyrin)copper(II) derivatives: [Cu(2,7,12-trioxoOEHP·)][SbCl6] and [Cu(2,7-dioxoOEiBC·)][SbCl6]

2011 ◽  
Vol 15 (05n06) ◽  
pp. 373-381 ◽  
Author(s):  
Ilona Turowska-Tyrk ◽  
Seong-Joo Kang ◽  
W. Robert Scheidt
Keyword(s):  
Solid State ◽  
Single Crystal ◽  
Cation Radical ◽  
X Ray ◽  
Near Ir ◽  
Derivatives Of

The preparation and characterization of two π-cation radical derivatives of copper β-oxoporphyrins is described. [3,3,8,8,13,13,17,18-octaethyl-(3H,8H,13H)-porphine-2,7,12-trionato (2-)] copper π-cation radical, [ Cu (2,7,12-trioxoOEHP·)]+, and [3,3,8,8,12,13,17,18-octaethyl-(3H,8H)-porphine-2,7-dionato(2-)] copper π-cation radical, [ Cu (2,7-dioxoOEiBC·)]+, have been prepared and characterized by single-crystal X-ray determinations, UV/vis/NIR, and IR spectroscopies. Both molecules have modest distortion from the planarity and show monomeric units in the solid state. [ Cu (2,7-dioxoOEiBC·)]+ shows a concentration dependent near-IR band at 1410 nm.

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