The Experts below are selected from a list of 54279 Experts worldwide ranked by ideXlab platform
Mitsuo Tasumi - One of the best experts on this subject based on the ideXlab platform.
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vibrational relaxation dynamics of trans stilbene in the lowest excited Singlet State pump and probe wavelength dependencies of the picosecond time resolved anti stokes raman spectrum
Journal of Physical Chemistry A, 1998Co-Authors: Takakazu Nakabayashi, Hiromi Okamoto, Mitsuo TasumiAbstract:The vibrational relaxation process of trans-stilbene in the lowest electronically excited Singlet State after photoexcitation has been studied by picosecond time-resolved anti-Stokes Raman spectros...
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vibrational relaxation dynamics of trans stilbene in the lowest excited Singlet State pump and probe wavelength dependencies of the picosecond time resolved anti stokes raman spectrum
Journal of Physical Chemistry A, 1998Co-Authors: Takakazu Nakabayashi, Hiromi Okamoto, Mitsuo TasumiAbstract:The vibrational relaxation process of trans-stilbene in the lowest electronically excited Singlet State after photoexcitation has been studied by picosecond time-resolved anti-Stokes Raman spectroscopy using several pump and probe wavelengths. Measurements of pump wavelength dependency have shown that, when the molecules are excited by pump photons with a high excess vibrational energy (∼5200 cm-1), part of the excess vibrational energy remains localized in the olefinic CC stretching (ν7) and the C−Ph stretching (ν15) modes for a period within the time resolution of the present measurements (∼5 ps) after photoexcitation. Analysis of the probe wavelength dependency has indicated that the vibrationally excited transients observed in the picosecond anti-Stokes Raman spectra are for the most part in the lowest excited vibrational levels (n = 1), as far as the ν7 and ν15 modes are concerned. From these results it is suggested that the intramolecular vibrational relaxation process proceeds in roughly two steps....
Baptiste Jamain - One of the best experts on this subject based on the ideXlab platform.
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constant adiabaticity radiofrequency pulses for generating long lived Singlet spin States in nmr
Journal of Chemical Physics, 2019Co-Authors: Bogdan A Rodin, Kirill F Sheberstov, Alexey S Kiryutin, Joseph T Hillcousins, Lynda J Brown, Richard C D Brown, Baptiste JamainAbstract:A method is implemented to perform “fast” adiabatic variation of the spin Hamiltonian by imposing the constant adiabaticity condition. The method is applied to improve the performance of Singlet-State Nuclear Magnetic Resonance (NMR) experiments, specifically, for efficient generation and readout of the Singlet spin order in coupled spin pairs by applying adiabatically ramped RF-fields. Test experiments have been performed on a specially designed molecule having two strongly coupled 13C spins and on selectively isotopically labelled glycerol having two pairs of coupled protons. Optimized RF-ramps show improved performance in comparison, for example, to linear ramps. We expect that the methods described here are useful not only for Singlet-State NMR experiments but also for other experiments in magnetic resonance, which utilize adiabatic variation of the spin Hamiltonian.A method is implemented to perform “fast” adiabatic variation of the spin Hamiltonian by imposing the constant adiabaticity condition. The method is applied to improve the performance of Singlet-State Nuclear Magnetic Resonance (NMR) experiments, specifically, for efficient generation and readout of the Singlet spin order in coupled spin pairs by applying adiabatically ramped RF-fields. Test experiments have been performed on a specially designed molecule having two strongly coupled 13C spins and on selectively isotopically labelled glycerol having two pairs of coupled protons. Optimized RF-ramps show improved performance in comparison, for example, to linear ramps. We expect that the methods described here are useful not only for Singlet-State NMR experiments but also for other experiments in magnetic resonance, which utilize adiabatic variation of the spin Hamiltonian.
Takakazu Nakabayashi - One of the best experts on this subject based on the ideXlab platform.
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vibrational relaxation dynamics of trans stilbene in the lowest excited Singlet State pump and probe wavelength dependencies of the picosecond time resolved anti stokes raman spectrum
Journal of Physical Chemistry A, 1998Co-Authors: Takakazu Nakabayashi, Hiromi Okamoto, Mitsuo TasumiAbstract:The vibrational relaxation process of trans-stilbene in the lowest electronically excited Singlet State after photoexcitation has been studied by picosecond time-resolved anti-Stokes Raman spectros...
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vibrational relaxation dynamics of trans stilbene in the lowest excited Singlet State pump and probe wavelength dependencies of the picosecond time resolved anti stokes raman spectrum
Journal of Physical Chemistry A, 1998Co-Authors: Takakazu Nakabayashi, Hiromi Okamoto, Mitsuo TasumiAbstract:The vibrational relaxation process of trans-stilbene in the lowest electronically excited Singlet State after photoexcitation has been studied by picosecond time-resolved anti-Stokes Raman spectroscopy using several pump and probe wavelengths. Measurements of pump wavelength dependency have shown that, when the molecules are excited by pump photons with a high excess vibrational energy (∼5200 cm-1), part of the excess vibrational energy remains localized in the olefinic CC stretching (ν7) and the C−Ph stretching (ν15) modes for a period within the time resolution of the present measurements (∼5 ps) after photoexcitation. Analysis of the probe wavelength dependency has indicated that the vibrationally excited transients observed in the picosecond anti-Stokes Raman spectra are for the most part in the lowest excited vibrational levels (n = 1), as far as the ν7 and ν15 modes are concerned. From these results it is suggested that the intramolecular vibrational relaxation process proceeds in roughly two steps....
Alberta B Ross - One of the best experts on this subject based on the ideXlab platform.
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rate constants for the decay and reactions of the lowest electronically excited Singlet State of molecular oxygen in solution an expanded and revised compilation
Journal of Physical and Chemical Reference Data, 1995Co-Authors: Francis Wilkinson, Phillip W Helman, Alberta B RossAbstract:An expanded and revised compilation on the reactivity of Singlet oxygen, the lowest electronically excited Singlet State of molecular oxygen, 1O2*(1Δg), in fluid solution is presented, which supersedes the publication of Wilkinson and Brummer, J. Phys. Chem. Ref. Data 10, 809 (1981). Rate constants for the chemical reaction and physical deactivation of Singlet oxygen available through 1993 have been critically compiled. Solvent deactivation rates (kd) are tabulated for 145 solvents or solvent mixtures and second‐order rate constants for interaction of Singlet oxygen with 1915 compounds are reported.
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quantum yields for the photosensitized formation of the lowest electronically excited Singlet State of molecular oxygen in solution
Journal of Physical and Chemical Reference Data, 1993Co-Authors: Francis Wilkinson, Phillip W Helman, Alberta B RossAbstract:Quenching of excited Singlet and triplet States of many substances by ground State molecular oxygen produces Singlet oxygen, the lowest electronically excited Singlet State of molecular oxygen, O2(1Δg). The fractions of Singlet and triplet States quenched which produce Singlet oxygen and the quantum yields of formation of Singlet oxgyen in fluid solutions have been critically compiled. Methods for determination yield parameters have been reviewed. Data have been compiled from the literature through 1991. Photosensitizers such as aromatic hydrocarbons, aromatic ketones and thiones, quinones, coumarins, fluoresceins, transition metal complexes, and heterocyclics are included in Table 1. Porphyrins and phthalocyanines are included in Table 2. Other materials which have been investigated for Singlet oxygen production, such as dyes and drugs, are collected in Table 3 along with heterogeneous systems such as polymer‐bound photosensitizers.
Hiromi Okamoto - One of the best experts on this subject based on the ideXlab platform.
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vibrational relaxation dynamics of trans stilbene in the lowest excited Singlet State pump and probe wavelength dependencies of the picosecond time resolved anti stokes raman spectrum
Journal of Physical Chemistry A, 1998Co-Authors: Takakazu Nakabayashi, Hiromi Okamoto, Mitsuo TasumiAbstract:The vibrational relaxation process of trans-stilbene in the lowest electronically excited Singlet State after photoexcitation has been studied by picosecond time-resolved anti-Stokes Raman spectros...
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vibrational relaxation dynamics of trans stilbene in the lowest excited Singlet State pump and probe wavelength dependencies of the picosecond time resolved anti stokes raman spectrum
Journal of Physical Chemistry A, 1998Co-Authors: Takakazu Nakabayashi, Hiromi Okamoto, Mitsuo TasumiAbstract:The vibrational relaxation process of trans-stilbene in the lowest electronically excited Singlet State after photoexcitation has been studied by picosecond time-resolved anti-Stokes Raman spectroscopy using several pump and probe wavelengths. Measurements of pump wavelength dependency have shown that, when the molecules are excited by pump photons with a high excess vibrational energy (∼5200 cm-1), part of the excess vibrational energy remains localized in the olefinic CC stretching (ν7) and the C−Ph stretching (ν15) modes for a period within the time resolution of the present measurements (∼5 ps) after photoexcitation. Analysis of the probe wavelength dependency has indicated that the vibrationally excited transients observed in the picosecond anti-Stokes Raman spectra are for the most part in the lowest excited vibrational levels (n = 1), as far as the ν7 and ν15 modes are concerned. From these results it is suggested that the intramolecular vibrational relaxation process proceeds in roughly two steps....
