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Malakhovskii, A. V.
Origin of the giant circular dichroism of vibronic f-f transitions / A. V. Malakhovskii // Mol. Phys. - 2017. - Vol. 115, Is. 14. - P. 1687-1690, DOI 10.1080/00268976.2017.1317113. - Cited References:24. - Russian Foundation for Basic Researches [grant number 16-02-00273]; the President of Russia [grant number Nsh-7559.2016.2]. . - ISSN 0026-8976. - ISSN 1362-3028

РУБ Chemistry, Physical + Physics, Atomic, Molecular & Chemical
Рубрики:
D-3 LANTHANIDE(III) COMPLEXES
   RARE-EARTH IONS
   OPTICAL-ACTIVITY
   LINE STRENGTHS
Кл.слова (ненормированные):
Natural circular dichroism -- f-f transitions
Аннотация: Taking into account the space inhomogeneity of the light electromagnetic wave, a new quantum mechanical expression for the natural optical activity (NOA) of electron transitions has been obtained, which is consistent with the phenomenological theory. It is shown that properties of the NOA of parity forbidden f–f transitions substantially differ from those of allowed transitions. The experimentally observed large NOA of the f–f transitions and extremely large (close to unity) NOA of vibrational repetitions of the f–f transitions are qualitatively explained on the basis of the obtained theoretical expression.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Малаховский, Александр Валентинович; Russian Foundation for Basic Researches [16-02-00273]; [Nsh-7559.2016.2]
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X-ray Natural Circular Dichroism imaging of multiferroic crystals / M. S. Platunov, I. A. Gudim, E. N. Ovchinnikova [et al.] // Crystals. - 2021. - Vol. 11, Is. 5. - Ст. 531, DOI 10.3390/cryst11050531. - Cited References: 70. - This research was funded by the Russian Science Foundation (grant 19-72-00002). K.A.K. acknowledges support from the Russian Foundation for Basic Research (project no. 19-52-12029 and project no. 19-02-00483). V.E.D. was partly supported by the Ministry of Science and Higher Education of the Russian Federation within the State assignment FSRC "Crystallography and Photonics" RAS. V.Y.I. and A.A.M. were supported by the Russian Science Foundation [grant 16-12-10531] . - ISSN 2073-4352

РУБ Crystallography + Materials Science, Multidisciplinary
Рубрики:
OPTICAL-ACTIVITY
MAGNETOELASTIC PROPERTIES
SINGLE-CRYSTAL
Кл.слова (ненормированные):
multiferroics -- X-ray optical activity -- twinning -- mapping -- X-ray Natural Circular Dichroism
Аннотация: The polarizing spectroscopy techniques in visible range optics have been used since the beginning of the 20th century to study the anisotropy of crystals based on birefringence and optical activity phenomena. On the other hand, the phenomenon of X-ray optical activity has been demonstrated only relatively recently. It is a selective probe for the element-specific properties of individual atoms in non-centrosymmetric materials. We report the X-ray Natural Circular Dichroism (XNCD) imaging technique which enables spatially resolved mapping of X-ray optical activity in non-centrosymmetric materials. As an example, we present the results of combining micro-focusing X-ray optics with circularly polarized hard X-rays to make a map of enantiomorphous twinning in a multiferroic SmFe3(BO3)4 crystal. Our results demonstrate the utility and potential of polarization-contrast imaging with XNCD as a sensitive technique for multiferroic crystals where the local enantiomorphous properties are especially important. In perspective, this brings a novel high-performance method for the characterization of structural changes associated with phase transitions and identification of the size and spatial distribution of twin domains.

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Держатели документа:
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119991, Russia.
ESRF European Synchrotron, CS 40220, F-38043 Grenoble 9, France.
Hebrew Univ Jerusalem, Rachel & Selim Sch Engn, Dept Appl Phys, IL-9190401 Jerusalem, Israel.
Russian Acad Sci, Prokhorov Gen Phys Inst, Moscow 119991, Russia.
RAS, FSRC Crystallog & Photon, AV Shubnikov Inst Crystallog, Moscow 119333, Russia.

Доп.точки доступа:
Platunov, M. S.; Платунов, Михаил Сергеевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Ovchinnikova, Elena N.; Kozlovskaya, Ksenia A.; Wilhelm, Fabrice; Rogalev, Andrei; Hen, Amir; Ivanov, Vsevolod Y.; Mukhin, Alexander A.; Dmitrienko, Vladimir E.; Russian Science FoundationRussian Science Foundation (RSF) [19-72-00002, 16-12-10531]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-52-12029, 19-02-00483]; Ministry of Science and Higher Education of the Russian Federation within the State assignment FSRC "Crystallography and Photonics" RAS
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