148 results on '"Koyama, Yasushi"'
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2. Energies and excited-state dynamics of [formula omitted], [formula omitted] and [formula omitted] states of carotenoids bound to LH2 antenna complexes from purple photosynthetic bacteria
3. Vibrational relaxation and internal conversion in the overlapped optically-allowed [formula omitted] and optically-forbidden [formula omitted] or [formula omitted] vibronic levels of carotenoids: Effects of diabatic mixing as determined by Kerr-gate fluorescence spectroscopy
4. Theoretical description of diabatic mixing and coherent excitation in singlet-excited states of carotenoids
5. Strong carotenoid-to-peptide interaction immediately after triplet excitation triggering conformational changes in photo-reaction center-bound 15-cis-spheroidene as revealed by submicrosecond time-resolved Raman spectroscopy
6. Stimulated emission from the [formula omitted](0) level and the [formula omitted](0) + 1 [formula omitted] (1 and 2) diabatic levels upon excitation to the 1 [formula omitted](0) level in neurosporene and spheroidene
7. Excitation followed by stimulated-emission from diabatic levels in all- trans- and 15- cis-β-carotenes: Effects of molecular symmetry and solvent polarity
8. Negligible shift of [formula omitted] potential in longer-chain carotenoids as revealed by a single persistent peak of [formula omitted] stimulated emission followed by [formula omitted] transient-absorption
9. Presence and absence of electronic mixing in shorter-chain and longer-chain carotenoids: Assignment of the symmetries of [formula omitted] and [formula omitted] states located just below the [formula omitted] state
10. Fabrication of dye-sensitized solar cells using chlorophylls c1 and c2 and their oxidized forms [formula omitted] and [formula omitted] from Undaria pinnatifida (Wakame)
11. Vibrational relaxation on the mixed vibronic levels of the [formula omitted] and [formula omitted] states in all- trans-neurosporene as revealed by subpicosecond time-resolved, stimulated emission and transient absorption spectroscopy
12. A dye-sensitized solar cell using pheophytin–carotenoid adduct: Enhancement of photocurrent by electron and singlet-energy transfer and by suppression of singlet–triplet annihilation due to the presence of the carotenoid moiety
13. Singlet internal conversion processes in the order of [formula omitted] in all- trans-spheroidene and lycopene as revealed by subpicosecond time-resolved Raman spectroscopy
14. Effects of plant carotenoid spacers on the performance of a dye-sensitized solar cell using a chlorophyll derivative: Enhancement of photocurrent determined by one electron-oxidation potential of each carotenoid
15. The [formula omitted] internal conversion in carotenoids following the energy-gap law identified by 5 fs spectroscopy
16. Photocurrents of solar cells sensitized by aggregate-forming polyenes: Enhancement due to suppression of singlet–triplet annihilation by lowering of dye concentration or light intensity
17. Dye-sensitized solar cells using retinoic acid and carotenoic acids: Dependence of performance on the conjugation length and the dye concentration
18. Low-lying singlet states of carotenoids having 8–13 conjugated double bonds as determined by electronic absorption spectroscopy
19. Dye-sensitized solar cells using a chlorophyll a derivative as the sensitizer and carotenoids having different conjugation lengths as redox spacers
20. Generation of the radical cation of β-carotene in chloroform via the triplet state as revealed by time-resolved absorption spectroscopy
21. The state energy and the displacements of the potential minima of the 2A g− state in all- trans-β-carotene as determined by fluorescence spectroscopy
22. A new singlet-excited state of all- trans-spheroidene as detected by resonance-Raman excitation profiles
23. Energies and excited-state dynamics of 1Bu+, 1Bu- and 3Ag- states of carotenoids bound to LH2 antenna complexes from purple photosynthetic bacteria
24. Vibrational relaxation and internal conversion in the overlapped optically-allowed 1Bu+ and optically-forbidden 1Bu- or 3Ag- vibronic levels of carotenoids: Effects of diabatic mixing as determined by Kerr-gate fluorescence spectroscopy
25. Stimulated emission from the 1Bu-(0) level and the 1Bu+(0) + 1Bu- (1 and 2) diabatic levels upon excitation to the 1Bu+(0) level in neurosporene and spheroidene
26. Negligible shift of 3Ag- potential in longer-chain carotenoids as revealed by a single persistent peak of 3Ag-→1Ag- stimulated emission followed by 3Ag-←1Ag- transient-absorption
27. Fabrication of dye-sensitized solar cells using chlorophylls c1 and c2 and their oxidized forms c1′ and c2′ from Undaria pinnatifida (Wakame)
28. Presence and absence of electronic mixing in shorter-chain and longer-chain carotenoids: Assignment of the symmetries of 1Bu- and 3Ag- states located just below the 1Bu+ state
29. Vibrational relaxation on the mixed vibronic levels of the 1Bu+ and 1Bu- states in all-trans-neurosporene as revealed by subpicosecond time-resolved, stimulated emission and transient absorption spectroscopy
30. Singlet internal conversion processes in the order of 1Bu+→3Ag-→1Bu-→2Ag-→1Ag- in all-trans-spheroidene and lycopene as revealed by subpicosecond time-resolved Raman spectroscopy
31. The 1Bu+→3Ag-→1Bu-→2Ag- internal conversion in carotenoids following the energy-gap law identified by 5 fs spectroscopy
32. Generation of carotenoid radical cation in the vicinity of a chlorophyll derivative bound to titanium oxide, upon excitation of the chlorophyll derivative to the Qy state, as identified by time-resolved absorption spectroscopy
33. Vibrational relaxation in the 1Bu+ state of carotenoids as determined by Kerr-gate fluorescence spectroscopy
34. Sequential singlet internal conversion of 1Bu+→ 3Ag−→ 1Bu−→ 2Ag−→ (1Ag− ground) in all-trans-spirilloxanthin revealed by two-dimensional sub-5-fs spectroscopy
35. Dependence of singlet-energy transfer on the conjugation length of carotenoids reconstituted into the LH1 complex from Rhodospirillum rubrum G9
36. The role of the 11Bu− state in carotenoid-to-bacteriochlorophyll singlet-energy transfer in the LH2 antenna complexes from Rhodobacter sphaeroides G1C, Rhodobacter sphaeroides 2.4.1, Rhodospirillum molischianum and Rhodopseudomonas acidophila
37. The energies and kinetics of triplet carotenoids in the LH2 antenna complexes as determined by phosphorescence spectroscopy
38. Internal conversion of 1Bu+ → 1Bu− → 2Ag− and fluorescence from the 1Bu− state in all-trans-neurosporene as probed by up-conversion spectroscopy
39. Reaction rates of the hydrated electron with N2O in high temperature water and potential surface of the N2O− anion
40. A first detection of singlet to triplet conversion from the 11Bu− to the 13Ag state and triplet internal conversion from the 13Ag to the 13Bu state in carotenoids: dependence on the conjugation length
41. Two different pathways of internal conversion in carotenoids depending on the length of the conjugated chain
42. Internal-conversion and radiative-transition processes among the 1Bu+, 1Bu− and 2Ag− states of all-trans-neurosporene as revealed by subpicosecond time-resolved Raman spectroscopy
43. The first detection of the 3A g − state in carotenoids using resonance-Raman excitation profiles
44. The 1Bu-type singlet state of β-carotene as a precursor of the radical cation found in chloroform solution by sub-picosecond time-resolved absorption spectroscopy
45. Partition of carotenoid-to-bacteriochlorophyll singlet-energy transfer through two channels in the LH2 complex from Rhodobacter sphaeroides G1C
46. Sub-picosecond time-resolved absorption spectroscopy of all-trans-neurosporene in solution and bound to the LH2 complex from Rhodobacter sphaeroides G1C
47. Excited-state dynamics among the 1Bu+, 1Bu− and 2Ag− states of all-trans-neurosporene as revealed by near-infrared time-resolved absorption spectroscopy
48. The state energy and the displacements of the potential minima of the 2Ag− state in all-trans-β-carotene as determined by fluorescence spectroscopy
49. The 2Ag− energy of crystalline all-trans-spheroidene as determined by resonance-Raman excitation profiles
50. The 2Ag− energies of all-trans-neurosporene and spheroidene as determined by fluorescence spectroscopy
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