X‐Ray Detected Optical Activity

Goulon, J.; Рогалев, А.; Brouder, Christian

doi:10.1002/9781118120187.ch17

Cited by 4 publications

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“…that is compatible with the low symmetry of the metal site induced by the ligands. Similar wide-energy XNCD features were also observed in Nd III 33 and Ni II 34 compounds, in which the chirality is induced by the structural arrangement of non-chiral moieties, whereas the XMCD signal for a Co II complex with chiral coordination is present only in the pre-edge region where the 3d orbitals contribute predominantly. 35…”

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confidence: 65%

“…The results are shown in the inset of Figure 4 and reveals that the magnetochiral effect exceeds 3% of the corresponding absorptions, thus a remarkable quantity compared to previous reported values. 17-21,37 For instance XMχD of [Co-NIT] ∞ is two orders of magnitude stronger than what obtained from preliminary measurements at the K edge on a Cr III -Ni II molecular ferromagnet 34 or to that measured in absorption experiments in the UV-vis range on a ferromagnetically ordered Cr III -Mn II molecular compound. 19…”

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confidence: 75%

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Strong magneto-chiral dichroism in a paramagnetic molecular helix observed by hard X-rays

et al. 2014

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Magneto-chiral dichroism (MχD) is a non-reciprocal, i. e. directional, effect observed in magnetised chiral systems featuring an unbalanced absorption of unpolarised light depending on the direction of the magnetisation. Despite the fundamental interest in a phenomenon breaking both parity and time reversal symmetries, MχD is one of the least investigated aspects of light-matter interaction because of the weakness of the effect in most reported experiments. Here we have exploited the element selectivity of hard X-ray radiation to investigate the magneto-chiral properties of enentiopure crsytals of two isostructural molecular helicoidal chains comprising Cobalt(II) and Manganese (II) ions, respectively. A strong magneto-chiral dichroism, with Kuhn asymmetry of the order of a few percent, has been observed in the Cobalt chain system, while it is practically absent for the Manganese derivative. The spectral features of the XMχD signal differ significantly from the natural and magnetic dichroic contributions and have been here rationalized using the simple multipolar expansion of matter-radiation interaction.

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Strong magneto-chiral dichroism in a paramagnetic molecular helix observed by hard X-rays

et al. 2014

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“…In the X-ray regime, the technique is known as X-ray circular dichroism (XCD) or X-ray natural circular dichroism (XNCD). 6 Another chiral technique, X-ray magnetic circular dichroism (XMCD), measures the CD signals induced by an external magnetic field. 7 , 8 The relevant transitions in XCD are localized near the core-excited atom.…”

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confidence: 99%

X-ray circular dichroism signals: a unique probe of local molecular chirality

et al. 2017

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“…The standard reference for a treatment of the theory of optical activities in molecular systems is the book by Barron, and the amount of experimental and theoretical work in the field is vast as demonstrated in the two comprehensive volumes edited by Berova et al While the underlying theory of optical activity in the X-ray region is the same as for the UV/vis region, there are a comparatively minuscule number of publications devoted to simulations of molecular optical activities in the X-ray region of the spectrum owing to the fact that intense circularly polarized X-ray beams are only recently available and the experimental activity has been limited, as reviewed in the chapter by Goulon et al…”

Section: Applications In X-ray Spectroscopiesmentioning

confidence: 99%

Simulating X-ray Spectroscopies and Calculating Core-Excited States of Molecules

2018

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During the past decade, the research field of computational X-ray spectroscopy has witnessed an advancement triggered by the development of advanced synchrotron light sources and X-ray free electron lasers that in turn has enabled new sophisticated experiments with needs for supporting theoretical investigations. Following a discussion about fundamental conceptual aspects of the physical nature of core excitations and the concomitant requirements on theoretical methods, an overview is given of the major developments made in electronic-structure theory for the purpose of simulating advanced X-ray spectroscopies, covering methods based on density-functional theory as well as wave function theory. The capabilities of these theoretical approaches are illustrated by an overview of simulations of selected linear and nonlinear X-ray spectroscopies, including X-ray absorption spectroscopy (XAS), X-ray natural circular dichroism (XNCD), X-ray emission spectroscopy (XES), resonant inelastic X-ray scattering (RIXS), and X-ray two-photon absorption (XTPA).

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X‐Ray Detected Optical Activity

Cited by 4 publications

References 107 publications

Strong magneto-chiral dichroism in a paramagnetic molecular helix observed by hard X-rays

Strong magneto-chiral dichroism in a paramagnetic molecular helix observed by hard X-rays

X-ray circular dichroism signals: a unique probe of local molecular chirality

Simulating X-ray Spectroscopies and Calculating Core-Excited States of Molecules

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