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Hempel F, Vernuccio F, König L, Buschbeck R, Rüsing M, Cerullo G, Polli D, Eng LM. Comparing transmission- and epi-BCARS: a round robin on solid-state materials. APPLIED OPTICS 2024; 63:112-121. [PMID: 38175007 DOI: 10.1364/ao.505374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Accepted: 11/29/2023] [Indexed: 01/05/2024]
Abstract
Broadband coherent anti-Stokes Raman scattering (BCARS) is a powerful spectroscopy method combining high signal intensity with spectral sensitivity, enabling rapid imaging of heterogeneous samples in biomedical research and, more recently, in crystalline materials. However, BCARS encounters spectral distortion due to a setup-dependent non-resonant background (NRB). This study assesses BCARS reproducibility through a round robin experiment using two distinct BCARS setups and crystalline materials with varying structural complexity, including diamond, 6H-SiC, KDP, and KTP. The analysis compares setup-specific NRB correction procedures, detected and NRB-removed spectra, and mode assignment. We determine the influence of BCARS setup parameters like pump wavelength, pulse width, and detection geometry and provide a practical guide for optimizing BCARS setups for solid-state applications.
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Volkov SN, Charkin DO, Firsova VA, Manelis LS, Banaru AM, Povolotskiy AV, Yukhno VA, Arsent'ev MY, Savchenko Y, Ugolkov VL, Krzhizhanovskaya MG, Bubnova RS, Aksenov SM. Ag 4B 7O 12X (X = Cl, Br, I) Heptaborate Family: Comprehensive Crystal Chemistry, Thermal Stability Trends, Topology, and Vibrational Anharmonicity. Inorg Chem 2023; 62:30-34. [PMID: 36541853 DOI: 10.1021/acs.inorgchem.2c03680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Using glass crystallization and solid-state techniques, we were able to complete the family of salt-inclusion silver halide borates, Ag4B7O12X, by the X = Cl and I members. The new compounds are characterized by differential scanning calorimetry, single-crystal and high-temperature powder X-ray diffraction, optical spectroscopy, and density functional theory calculations. In all structures, the silver atoms exhibit strong anharmonicity of thermal vibrations, which could be modeled using Gram-Charlier expansion, and its asymmetry was characterized by the skewness vector. The topology of the silver halide and borate sublattices has been analyzed separately for the first time. Along the I → Br → Cl series, we observe a decrease of the melting point and configuration entropy and an increase of thermal expansion and its anisotropy and thermal vibration anharmonicity, which indicates decreasing stability.
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Affiliation(s)
- Sergey N Volkov
- Laboratory of Arctic Mineralogy and Material Sciences, Kola Science Centre, Russian Academy of Sciences, Apatity 184209, Russia.,Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, St. Petersburg 199053, Russia
| | - Dmitri O Charkin
- Laboratory of Arctic Mineralogy and Material Sciences, Kola Science Centre, Russian Academy of Sciences, Apatity 184209, Russia.,Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Vera A Firsova
- Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, St. Petersburg 199053, Russia
| | - Lev S Manelis
- Laboratory of Arctic Mineralogy and Material Sciences, Kola Science Centre, Russian Academy of Sciences, Apatity 184209, Russia.,Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Alexander M Banaru
- Laboratory of Arctic Mineralogy and Material Sciences, Kola Science Centre, Russian Academy of Sciences, Apatity 184209, Russia.,Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Alexey V Povolotskiy
- Institute of Chemistry, St. Petersburg State University, St. Petersburg 198504, Russia
| | - Valentina A Yukhno
- Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, St. Petersburg 199053, Russia
| | - Maxim Yu Arsent'ev
- Laboratory of Arctic Mineralogy and Material Sciences, Kola Science Centre, Russian Academy of Sciences, Apatity 184209, Russia.,Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, St. Petersburg 199053, Russia
| | - Yevgeny Savchenko
- Geological Institute, Kola Science Centre, Russian Academy of Sciences, Apatity 184209, Russia.,Nanomaterials Research Centre, Kola Science Centre, Russian Academy of Sciences, Apatity 184209, Russia
| | - Valery L Ugolkov
- Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, St. Petersburg 199053, Russia
| | - Maria G Krzhizhanovskaya
- Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, St. Petersburg 199053, Russia.,Department of Crystallography, St. Petersburg State University, St. Petersburg 199034, Russia
| | - Rimma S Bubnova
- Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, St. Petersburg 199053, Russia
| | - Sergey M Aksenov
- Laboratory of Arctic Mineralogy and Material Sciences, Kola Science Centre, Russian Academy of Sciences, Apatity 184209, Russia.,Geological Institute, Kola Science Centre, Russian Academy of Sciences, Apatity 184209, Russia
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Abstract
The molecular net complexity (HmolNet) is an extension of the combinatorial complexity (Hmol) of a crystal structure introduced by Krivovichev. It was calculated for a set of 4152 molecular crystal structures with the composition of CxHyOz characterized by the structural class P21/c, Z = 4 (1). The molecular nets were derived from the molecular Voronoi–Dirichlet Polyhedra (VDPmol). The values of the molecular coordination number (CNmol) and critical coordination number (CNcrit) are discussed in relation with the complexity of the crystal structures. A statistical distribution of the set of molecular crystals based on the values of CNmol, CNcrit, and the complexity parameters is obtained. More than a half of the considered structures has CNmol = 14 and CNmol′ = 9 with the Wyckoff set of edges e5dcba. The average multiplicity of intermolecular contacts statistically significantly decreases from 1.58 to 1.51 upon excluding all contacts except those bearing the molecular net. The normalized value of HmolNet is of the logistic distribution type and is distributed near 0.85HmolNet with a small standard deviation. The contribution of Hmol into HmolNet ranges from 35 to 95% (mean 79%, SD 6%), and the subset of bearing intermolecular contacts accounts for 41 to 100% (mean 62%, SD 11%) of the complexity of the full set of intermolecular contacts.
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Abstract
Abstract
We present an illustrative analysis of the complexity of a crystal structure based on the application of Shannon’s entropy formula in the form of Krivovichev’s complexity measures and extended according to the contributions of distinct discrete probability distributions derived from the atomic numbers and the Wyckoff multiplicities and arities of the atoms and sites constituting the crystal structure, respectively. The results of a full crystallographic complexity partition analysis for the intermetallic phase Mo3Al2C, a compound of intermediate structural complexity, are presented, with all calculations performed in detail. In addition, a partial analysis is discussed for the crystal structures of α- and β-quartz.
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Affiliation(s)
- Wolfgang Hornfeck
- Institute of Physics of the Academy of Sciences of the Czech Republic , Na Slovance 2, 182 21 Praha 8 , Czech Republic
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Abstract
Structural complexity measures based on Shannon information entropy are widely used for inorganic crystal structures. However, the application of these parameters for molecular crystals requires essential modification since atoms in inorganic compounds usually possess more degrees of freedom. In this work, a novel scheme for the calculation of complexity parameters (HmolNet, HmolNet,tot) for molecular crystals is proposed as a sum of the complexity of each molecule, the complexity of intermolecular contacts, and the combined complexity of both. This scheme is tested for several molecular crystal structures.
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