نتایج جستجو برای: kinetic triplet

تعداد نتایج: 98741  

2016
Mario Borgwardt Martin Wilke Thorsten Kampen Sven Mähl Wanchun Xiang Leone Spiccia Kathrin M. Lange Igor Yu. Kiyan Emad F. Aziz

The method of transient XUV photoemission spectroscopy is developed to investigate the ultrafast dynamics of heterogeneous electron transfer at the interface between the N719 ruthenium dye complex and TiO2 nanoparticles. XUV light from highorder harmonic generation is used to probe the electron density distribution among the ground and excited states at the interface after its exposure to a pum...

2015
Jessica D Sun Qian Liu Dharmendra Ahluwalia Wenwu Li Fanying Meng Yan Wang Deepthi Bhupathi Ayesha S Ruprell Charles P Hart

Tumors often contain hypoxic regions resistant to chemo- and radiotherapy. TH-302 (T) is an investigational hypoxia-activated prodrug that selectively releases the DNA cross-linker bromo-isophosphoramide mustard under hypoxic conditions. This study evaluated the efficacy and safety profile of combining T with gemcitabine (G) and nab-paclitaxel (nP) in human pancreatic ductal adenocarcinoma (PDA...

2017
Bettina S. Basel Johannes Zirzlmeier Constantin Hetzer Brian T. Phelan Matthew D. Krzyaniak S. Rajagopala Reddy Pedro B. Coto Noah E. Horwitz Ryan M. Young Fraser J. White Frank Hampel Timothy Clark Michael Thoss Rik R. Tykwinski Michael R. Wasielewski Dirk M. Guldi

When molecular dimers, crystalline films or molecular aggregates absorb a photon to produce a singlet exciton, spin-allowed singlet fission may produce two triplet excitons that can be used to generate two electron-hole pairs, leading to a predicted ∼50% enhancement in maximum solar cell performance. The singlet fission mechanism is still not well understood. Here we report on the use of time-r...

Journal: :Physical review letters 2006
Peter Staanum Stephan D Kraft Jörg Lange Roland Wester Matthias Weidemüller

Ultracold collisions between Cs atoms and Cs2 dimers in the electronic ground state are observed in an optically trapped gas of atoms and molecules. The Cs2 molecules are formed in the triplet ground state by cw photoassociation through the outer well of the 0-(g) (P3/2) excited electronic state. Inelastic atom-molecule collisions converting internal excitation into kinetic energy lead to a los...

Fereshteh Naderi Mohammad Yari Rahimeh Bagheri

The effects of halogens; fluorine, chlorine and bromine, on the stability and multiplicity of phenylcarbenes / silylenes/ germylenes structures are compared and contrasted at B3LYP/6-311++G**//B3LYP/6-31+G* level. The singlet-triplet energy gaps, ΔES-T , values for all the above speciesincrease through fluorinated up, ΔES-Ts and ΔEHOMO–LUMOs support the stability of the singlet statesinspite of...

2002
Harry Gómez Travis R. Taylor Yuexing Zhao Daniel M. Neumark

The low-lying electronic states of AlP, GaP, InP, and GaAs have been probed using anion photoelectron spectroscopy and zero electronic kinetic energy spectroscopy. We observe transitions from the anion S and low-lying P states to the triplet (S and P states! and singlet (P , S, and D states! manifolds of the neutral species. The spectra of the triplet manifolds are particularly complex, with ov...

Journal: :Biophysical journal 2003
Wendel Wohlleben Tiago Buckup Jennifer L Herek Richard J Cogdell Marcus Motzkus

A new channel of excitation energy deactivation in bacterial light harvesting was recently discovered, which leads to carotenoid triplet population on an ultrafast timescale. Here we show that this mechanism is also active in LH2 of Rhodopseudomonas acidophila through analysis of transient absorption data with an evolutionary target analysis. The algorithm offers flexible testing of kinetic net...

2016
Marco Marazzi Sebastian Mai Daniel Roca-Sanjuán Mickaël G. Delcey Roland Lindh Leticia González Antonio Monari

The photochemistry of benzophenone, a paradigmatic organic molecule for photosensitization, was investigated by means of surface-hopping ab initio molecular dynamics. Different mechanisms were found to be relevant within the first 600 fs after excitation; the long-debated direct (S1 → T1) and indirect (S1 → T2 → T1) mechanisms for population of the low-lying triplet state are both possible, wit...

2000
Leon Balents

A tight binding model is introduced to describe the strong interaction limit of excitonic ordering. At stoichiometry, the model reduces in the strong coupling limit to a pseudo-spin model with approximate U(4) symmetry. Excitonic order appears in the pseudospin model as in-plane pseudo-magnetism. The U(4) symmetry unifies all possible singlet and triplet order parameters describing such states....

Journal: :The journal of physical chemistry. B 2010
Eric C Greyson Brian R Stepp Xudong Chen Andrew F Schwerin Irina Paci Millicent B Smith Akin Akdag Justin C Johnson Arthur J Nozik Josef Michl Mark A Ratner

Singlet exciton fission, a process that converts one singlet exciton to a pair of triplet excitons, has the potential to enhance the efficiency of both bulk heterojunction and dye-sensitized solar cells and is understood in crystals but not well understood in molecules. Previous studies have identified promising building blocks for singlet fission in molecular systems, but little work has inves...

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