Results 261 to 270 of about 20,004,569 (303)
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2010
In this chapter, we would like to describe the dynamics of an excited state |s〉 which is prepared, for example, by electronic excitation, due to absorption of radiation. This state is an eigenstate of the diabatic Hamiltonian with energy \( E_s^0 \). Close in energy to |s〉 is a manifold of other states {|l〉}, which are not populated during the short ...
Philipp Scherer, Sighart F. Fischer
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In this chapter, we would like to describe the dynamics of an excited state |s〉 which is prepared, for example, by electronic excitation, due to absorption of radiation. This state is an eigenstate of the diabatic Hamiltonian with energy \( E_s^0 \). Close in energy to |s〉 is a manifold of other states {|l〉}, which are not populated during the short ...
Philipp Scherer, Sighart F. Fischer
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Excited-state dynamics of phenol–pyridinium biaryl
Phys. Chem. Chem. Phys., 2012The excited-state dynamics of a donor-acceptor phenol-pyridinium biaryl cation was investigated in various solvents by femtosecond transient absorption spectroscopy and temperature dependent steady-state emission measurements. After excitation to a near-planar Franck-Condon delocalized excited S(1)(DE) state with mesomeric character, three fast ...
Malval, J.P. +7 more
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Ultrafast excited-state dynamics of thiazole orange
Chemical Physics, 2022Thiazole orange (TO), an asymmetric cyanine dye, has been widely used in biomolecular detection and imaging of DNA/ RNA in gels, due to its unique fluorogenic behavior: fluorescence of free dye in aqueous solution is very weak but emission can be significantly enhanced in nucleic-acid-bound dye.
Zenan, Zhao +9 more
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Molecular Dynamics Simulation of the Excited-State Dynamics of Bacteriorhodopsin
Photochemistry and Photobiology, 1997Abstract— The excited‐state dynamics of bacteriorhodopsin was studied by molecular dynamics simulation. For the purpose of suppressing large displacement of amino acid residues on the surface of bacteriorhodopsin, positional restraints were imposed on these residues.
Takahisa Yamato, Toshiaki Kakitani
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Excited state dynamics of NaF:Cu+
The Journal of Chemical Physics, 1984We have previously used one- and two-photon spectroscopy to characterize the vibronic structures observed for NaF:Cu+ in the excited states of the d 9s configuration. We were able to resolve the zero-phonon lines and a progression of the first three or four quanta of the t1u vibration (involving the off-center motion of Cu+).
Andrea B. Goldberg +2 more
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Excited-State Dynamics of NADH
Topical Meeting on Ultrafast Phenomena, 1984The reduced form of nicotinamide-adenine dinucleotide (NADH) is a well-known, important enzyme cofactor. This molecule contains two chromophores - a dihydronicotinamide, lowest absorption band at 340 nm, and an adenine, absorption at 265 nm. Fluorescence of NADH has a λmax at 460 nm. This distinctive emission is used for in vivo assays of NADH.
D. W. Boldridge +6 more
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The Journal of Chemical Physics, 1983
The fluorescence decay of NO3 excited to vibronic levels between the origin at 661.9 and ∼606 nm is measured and found to be nonexponential. An exponential fit to the long-lived portion of the decay gives an apparent, collision-free lifetime of 340±20 μs. Electronic quenching rates have been measured for a variety of collision partners including He, N2,
H. H. Nelson +2 more
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The fluorescence decay of NO3 excited to vibronic levels between the origin at 661.9 and ∼606 nm is measured and found to be nonexponential. An exponential fit to the long-lived portion of the decay gives an apparent, collision-free lifetime of 340±20 μs. Electronic quenching rates have been measured for a variety of collision partners including He, N2,
H. H. Nelson +2 more
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Excited state dynamics in Ho:KPb2Cl5
Optical Materials, 2012Abstract Optical absorption spectra, emission spectra, and fluorescence lifetimes were measured for a number of visible and infrared transitions in Ho 3+ doped KPb 2 Cl 5 . Judd–Ofelt parameters were obtained by using the conventional approach, as well as by a modified approach that minimizes the fractional difference, rather than the absolute ...
R.S. Quimby +3 more
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Dynamics of DNA Excited States
1990The coherent emission of photons as well as the cooperative photon storage of DNA are discussed according to Dicke’s fundamental theory. Interactions between electromagnetic waves and mechanical base oscillations, which can be assigned to polaritons in the solid state physics, are necessary consequences of this discussion.
K. H. Li, F. A. Popp
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Molecular dynamics in low-spin excited states
The Journal of Chemical Physics, 1998A Kohn–Sham-like formalism is introduced for the treatment of excited singlet states. Motivated by ideas of Ziegler’s sum method and of restricted open-shell Hartree–Fock theory, a self-consistent scheme is developed that allows the efficient and accurate calculation of excited state geometries. Vertical as well as adiabatic excitation energies for the
Frank, I. +3 more
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