نتایج جستجو برای: circular dichroism spectroscopy

تعداد نتایج: 236933  

Background and Aim: Ephedra, Nepeta, and Hymenocrater herbs have long been used in the treatment of many diseases, but their interactions with cellular components, especially nuclear proteins, are still unknown. On the other hand, in the eukaryotic cell nucleus histone proteins play a main role in the packaging of the genetic material as chromatin. The present study aimed at comparing the in-vi...

2001
Sang-Koog Kim J. B. Kortright Sung-Chul Shin

A magnetization vector M imaging using a transmission x-ray microscope with magnetic circular dichroism ~MCD! contrast is demonstrated. MCD images through a semitransparent, 33-nm-thick Fe film are measured at the Fe L3 edge along three different x-ray propagation directions to determine all three components of the M. The transmission images clearly display the vector nature of complex microstr...

2008
M. A. Laguna-Marco

We present an x-ray magnetic circular dichroism XMCD study performed at the R L2 edge in RAl2 and RT2 T=Fe,Co intermetallic compounds. By analyzing the modification of the XMCD spectra as both the rare earth and the alloyed element Al, Fe, or Co are changed in the compound, an extra contribution, XMCDT, has been identified and undoubtedly associated with the R 5d -T 3d hybridization in Fe and C...

2009
William B. Sparks James Hough Thomas A. Germer Feng Chen Shiladitya DasSarma Priya DasSarma Frank T. Robb Nadine Manset Ludmilla Kolokolova Neill Reid F. Duccio Macchetto William Martin

The identification of a universal biosignature that could be sensed remotely is critical to the prospects for success in the search for life elsewhere in the universe. A candidate universal biosignature is homochirality, which is likely to be a generic property of all biochemical life. Due to the optical activity of chiral molecules, it has been hypothesized that this unique characteristic may ...

2017
M. Thuau J. Margerie

The orbital g-factor and the spin-orbit splittings of the first excited state of F-centres are measured in NaCl, NaBr, KBr and KF crystals by observing absorption and magnetic circular dichroism at various temperatures and using the moments method. Our experimental results and others are compared with Harker’s theoretical values. LE JOURNAL DE PHYSIQUE TOME 38, OCTOBRE 1977, Classification Phys...

2007
W. Kuch F. Offi L. I. Chelaru J. Wang K. Fukumoto M. Kotsugi

We present an x-ray spectromicroscopic investigation of single-crystalline magnetic FeMn/Co bilayers on Cu 001 , using x-ray magnetic circular dichroism and x-ray magnetic linear dichroism XMLD at the Co and Fe L3 absorption edges in combination with photoelectron emission microscopy. Using the magnetic coupling between the ferromagnetic Co layer and the antiferromagnetic FeMn layer, we are abl...

2014
Y. P. Cai K. Chesnel M. Trevino A. Westover R. G. Harrison J. M. Hancock S. Turley A. Scherz A. Reid B. Wu C. Graves T. Wang T. Liu

2012
Julia Herrero-Albillos F. Bartolomé A. T. Young

Detailed X-ray magnetic circular dichroism measurements as a function of temperature are reported in ErCo2 at the Co L2,3 edges. The application of magneto-optical sum rules allows for the determination of the Co orbital and spin magnetic moments both in the ferrimagnetic and paramagnetic phases. In agreement with the predictions of Hund’s third rule, Co orbital and spin moments are parallel th...

2016
N. M. Souza-Neto F. C. G. Gandra D. Haskel R. D. dos Reis

We describe how first principle calculations can play a key role in the interpretation of X-ray absorption near-edge structure (XANES) and X-ray magnetic circular dichroism (XMCD) spectra for a better understanding of emergent phenomena in condensed matter physics at high applied pressure. Eu compounds are used as case study to illustrate the advantages of this methodology, ranging from studies...

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