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Identification of metal-centered excited states in Cr(iii) complexes with time-resolved L-edge X-ray spectroscopy.
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European XFEL 22869 Schenefeld Germany
New coordination complexes of 3d metals that possess photoactive metal-centered (MC) excited states are promising targets for optical applications and photocatalysis. Ultrafast spectroscopy plays an important role in elucidating the photophysical mechanisms that underlie photochemical activity. However, it can be difficult to assign transient signals to specific electronic excited states and mechanistic information is often inferred from kinetics.
View Article and Find Full Text PDFInvestigation of the Nonlinear Optical Properties of Silk Fibroin (SF) Using the Z-Scan Method.
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Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee, Blvd., 1784 Sofia, Bulgaria.
Silk fibroin (SF), the primary protein in silkworm silk, has emerged as a promising organic nonlinear optical material due to its unique combination of optical transparency, biocompatibility, and environmental sustainability. In this study, we investigate the nonlinear optical properties of SF thin films using the -scan technique with femtosecond laser pulses (35 fs, 800 nm, 1 kHz). Our results reveal a strong self-defocusing effect (negative nonlinear refractive index) and significant multiphoton absorption, demonstrating SF's tunable nonlinear response.
View Article and Find Full Text PDFThe Formation of an Interface and Its Energy Levels Inside a Band Gap in InAs/GaSb/AlSb/GaSb M-Structures.
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Center for Microelectronics and Nanotechnology, Institute of Materials Engineering, University of Rzeszów, Al. Rejtana 16c, 35-959 Rzeszów, Poland.
We studied specially designed InAs/GaSb/AlSb/GaSb M-structures, a type-II superlattice (T2SL), that can serve as active materials for short-wavelength infrared (SWIR) applications. To obtain the dispersion relation of the investigated M-structures, k·p perturbation theory based on the eight-band model implemented in the nextnano++ v1.18.
View Article and Find Full Text PDFSpherical Amides with Symmetry: Improved Synthetic Approach and Structural/Optical Analysis.
Molecules
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Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi 274-8510, Chiba, Japan.
A spherical amide with symmetry was synthesized by a one-step cyclization reaction using triphenylphosphine and hexachloroethane as coupling reagents. This method enabled synthesis of -benzyl and -allyl derivatives, which could not be obtained by the previously reported method. The optical resolution of each compound was measured, and their electronic circular dichroism spectra revealed that they were mirror images.
View Article and Find Full Text PDFType II ZnO-MoS Heterostructure-Based Self-Powered UV-MIR Ultra-Broadband p-n Photodetectors.
Molecules
February 2025
Department of Physics, University of Puerto Rico, San Juan, PR 00936, USA.
This study presents the fabrication and characterization of ZnO-MoS heterostructure-based ultra-broadband photodetectors capable of operating across the ultraviolet (UV) to mid-infrared (MIR) spectral range (365 nm-10 μm). The p-n heterojunction was synthesized via RF magnetron sputtering and spin coating, followed by annealing. Structural and optical analyses confirmed their enhanced light absorption, efficient charge separation, and strong built-in electric field.
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