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Photofragmentation and fragment analysis; Coriolis interactions in excited states of CH.
Phys Chem Chem Phys
November 2024
Science Faculty, University of Iceland, Dunhagi 3, 107 Reykjavík, Iceland.
Methyl radicals in their ground state (CH(X)) were created and excited by two- and one- color excitation schemes for CHBr and CHI, respectively, to record (2+1) REMPI spectra of CH for resonant transitions to the Rydberg states CH**(pA); = 3, 4. Various new and previously observed vibrational bands were identified and analyzed to gain energetic information for the Rydberg states. Particular emphasis was placed on analysis of the rotational structured spectra centered at 70 648 and 60 700 cm, due to transitions from to and for both Rydberg states, respectively.
View Article and Find Full Text PDFChemical Quantum Dots in Bell Laboratories.
Acc Chem Res
September 2024
Chemistry Department, Columbia University, New York, New York 10025, United States.
ConspectusChemical quantum dots are small semiconductor crystallites (1.5 to 5 nm in diameter). Too small to behave as bulk semiconductors, they have band gaps and luminescence colors that vary with size in a controllable and predictable manner.
View Article and Find Full Text PDFDogs do not use their own experience with novel barriers to infer others' visual access.
Proc Biol Sci
June 2024
Comparative Cognition, Messerli Research Institute, University of Veterinary Medicine of Vienna, Medical University of Vienna and University of Vienna, Vienna 1210, Austria.
Despite extensive research into the Theory of Mind abilities in non-human animals, it remains controversial whether they can attribute mental states to other individuals or whether they merely predict future behaviour based on previous behavioural cues. In the present study, we tested pet dogs (in total, = 92) on adaptations of the 'goggles test' previously used with human infants and great apes. In both a cooperative and a competitive task, dogs were given direct experience with the properties of novel screens (one opaque, the other transparent) inserted into identical, but differently coloured, tunnels.
View Article and Find Full Text PDFDirect Population of Triplet States for Efficient Organic Afterglow through the Intra/Intermolecular Heavy-Atom Effect.
Molecules
February 2024
State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
Organic afterglow is a fascinating phenomenon with exceptional applications. However, it encounters challenges such as low intensity and efficiency, and typically requires UV-light excitation and facile intersystem crossing (ISC) due to its spin-forbidden nature. Here, we develop a novel strategy that bypasses the conventional ISC pathway by promoting singlet-triplet transition through the synergistic effects of the intra/intermolecular heavy-atom effect in aromatic crystals, enabling the direct population of triplet excited states from the ground state.
View Article and Find Full Text PDFStable color-tunable CaY(GaO)(BO):Bi/Tb/Eu phosphors for application in -UV-pumped LEDs.
Dalton Trans
February 2024
Hubei Key Laboratory of Plasma Chemistry and Advanced Materials & Key Laboratory of Green Chemical Engineering Process of Ministry of Education, Wuhan Institute of Technology, 430205, Wuhan, P. R. China.
For further development of light sources, white light-emitting diodes (LEDs) have attracted widespread attention as promising next-generation light sources fabricated the combination of phosphors and LED chips. However, latent defects, such as chemical/thermal instability, low color rendering index (CRI) and high correlated color temperature (CCT), of current mainstream LEDs seriously hinder their further large-scale implementation. Herein, in order to overcome these limitations, single-phase color-tunable gaudefroyite (CaY(GaO)(BO) (CYGB)) tridoped with Bi/Tb/Eu ions was synthesized for the first time and detailed characterisation was performed high-temperature solid-state reaction and structural/spectral analyses, respectively.
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