Magnetic circular dichroism and optical absorption spectra of Eu3+in Y3Al5O12(YAG)

1996 ◽  
Vol 92 (13) ◽  
pp. 2487-2493 ◽  
Author(s):  
Koen Binnemans ◽  
Christiane Görller-Walrand
Keyword(s):  
Circular Dichroism ◽  
Optical Absorption ◽  
Absorption Spectra ◽  
Magnetic Circular Dichroism ◽  
Optical Absorption Spectra ◽  
Circular Dichroïsm

Method of Gaussian quadrature in the calculation of optical absorption and magnetic circular dichroism spectra of s2 ions in alkali halide crystals: application to KBr:In+

1979 ◽  
Vol 57 (10) ◽  
pp. 1614-1623 ◽  
Author(s):  
Y. Kamishina ◽  
V. S. Sivasankar ◽  
P. W. M. Jacobs
Keyword(s):  
Circular Dichroism ◽  
Optical Absorption ◽  
Alkali Halide ◽  
Magnetic Circular Dichroism ◽  
Gaussian Quadrature ◽  
Electron Configuration ◽  
Alkali Halide Crystals ◽  
Complete Energy Matrix ◽  
Circular Dichroïsm ◽  
Good Agreement

The problem of calculating the lineshape function for optical absorption and magnetic circular dichroism due to ionic impurities with the ns2 outer electron configuration, incorporated substitutionally in alkali halide crystals, has been reformulated. The complete energy matrix has been diagonalized directly. Integration over the interaction mode coordinates of Eg and T2g symmetry has been carried out numerically using Gaussian quadrature formulae; the interaction with the A1g mode has been taken into account by the usual convolution procedure. The method has been applied to KBr:In+. The calculated lineshape functions for optical absorption at temperatures ranging from 4 to 300 K and, for MCD at 5 K, are in good agreement with the experimentally determined lineshapes. Moreover, the theory accounts very well for the observed variation of the effective g tensor for the A band with temperature. The calculated values for the moments of the absorption and MCD lineshape functions are in reasonably satisfactory agreement with those deduced from the observed spectra.

THz SPECTROSCOPY OF PROTEINS IN WATER: DIRECT ABSORPTION AND CIRCULAR DICHROISM

2007 ◽  
Vol 17 (04) ◽  
pp. 709-718 ◽  
Author(s):  
JING XU ◽  
KEVIN W. PLAXCO ◽  
S. JAMES ALLEN
Keyword(s):  
Circular Dichroism ◽  
Absorption Spectra ◽  
Magnetic Circular Dichroism ◽  
Broad Band ◽  
Thz Spectroscopy ◽  
Direct Absorption ◽  
Frequency Range ◽  
Egg White Lysozyme ◽  
Terahertz Absorption ◽  
Circular Dichroïsm

Many of the functionally relevant collective vibrations of proteins and other biopolymers are expected to occur at terahertz frequencies. Precise absorption measurements combined with careful titration of biopolymers in water have allowed us to directly measure the terahertz absorption spectra associated with these motions, despite the strong background absorption of the solvent. We have also explored the circular dichroism spectroscopy of biomolecules over this same frequency range. Since circular dichroism requires the presence of net chirality in a molecule and chirality is present in nearly all biomaterial, it has the potential to capture the background free spectral features in biopolymers. To undertake these studies we have developed a broad band terahertz spectrometer suitable for both direct absorption and circular dichroism measurements of proteins in water between 0.75 – 3.72 THz. Direct terahertz absorption spectra of prototypical proteins bovine serum albumin (BSA) and hen egg white lysozyme have been documented and are described here. We have also successfully demonstrated the magnetic circular dichroism in semiconductors, and placed an upper bound on the terahertz circular dichroism signature of solvated BSA. In the terahertz frequency range, it appears that circular dichroism signatures are exceedingly small and detection remains a challenge.

scholarly journals Magnetic circular dichroism in the soft-x-ray absorption spectra of Mn-based magnetic intermetallic compounds

1997 ◽  
Vol 56 (10) ◽  
pp. 6021-6030 ◽  
Author(s):  
A. Kimura ◽  
S. Suga ◽  
T. Shishidou ◽  
S. Imada ◽  
T. Muro ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Intermetallic Compounds ◽  
Absorption Spectra ◽  
Magnetic Circular Dichroism ◽  
X Ray ◽  
X Ray Absorption ◽  
Circular Dichroïsm
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