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Your search keyword '"Stokkum, Ivo H. M. van"' showing total 14 results
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14 results on '"Stokkum, Ivo H. M. van"'

2. Femtosecond excited state studies of the two-center three-electron bond driven twisted internal charge transfer dynamics in 1,8-bis(dimethylamino)naphthalene

Author

Balkowshi, Grzegorz, Szemik-Hojniak, Anna, Stokkum, Ivo H. M. van, Hong Zang, and Buma, Wybren J.

Subjects
Naphthalene -- Chemical properties, Charge transfer -- Research, Excited state chemistry -- Research, Chemicals, plastics and rubber industries
Abstract

The femtosecond fluorescence upconversion and transient absorption experiments were performed to monitor the photoinduced electronic, geometry, and solvent relaxation dynamics of 1,8-bis(dimethylamino)naphthalene dissolved in methycyclohexane and acetonitrile. It is concluded that the solvent relaxation and vibrational cooling in the lpi* state cannot be seperated in polar solvents, but in apolar solvents a distinct vibrational cooling process in the lpi* state is discerned.

Published
2005

3. Target analysis of the bacteriorhodopsin photocycle using a spectrotemporal model

Author

Stokkum, Ivo H. M. van and Lozier, Richard H.

Subjects
Chemistry, Physical and theoretical -- Research, Photochemical research -- Analysis, Rhodopsin -- Physiological aspects, Solvents -- Physiological aspects, Bacteriorhodopsin -- Physiological aspects, Chemicals, plastics and rubber industries
Published
2002

5. Dynamics of carbon monoxide photodissociation in bradyrhizobium japonicum fixl probed by picosecond midinfrared spectroscopy

Author

Wilderen, Luuk J. G. W. van, Key, Jason M., Stokkum, Ivo H. M. Van, Grondelle, Rienk van, and Groot, Marie Louise

Subjects
Binding proteins -- Structure, Binding proteins -- Physiological aspects, Binding proteins -- Research, Carbon monoxide -- Research, Infrared spectroscopy -- Usage, Photolysis -- Research, Chemicals, plastics and rubber industries
Published
2009

6. Light harvesting by carotenoids incorporated into the B850 light-harvesting complex from rhodobacter sphaeroides r-26: Excited state relaxation, ultrafast triplet formation and energy transfer to bacteriochlorophyll

Author

Papagiannakis, Emmanouil, Das, Somes Kumar, Kennis, John T. M, Gall, Andrew, Frank, Harry A, Stokkum, Ivo H. M van, Robert, Bruno, and Grondelle, Rienk van

Subjects
Bacteriology -- Research, Energy transfer -- Research, Photosynthesis -- Research, Carotenoids -- Research, Chemicals, plastics and rubber industries
Abstract

Spirilloxanthin and spheroidene are reconstituted into the carotenoidless B850 light-harvesting complex from the Rhodobacter sphaeroides R-26.1 mutant in order to obtain new insights in energy transfer, triplt formation and other relaxation phenomena in photosynthetic light harvesting.

Published
2003

14. Conformational Dynamics of Charge-Transfer States in Donor−Bridge−Acceptor Systems

Author

Lauteslager, Xavier Y., Stokkum, Ivo H. M. van, Ramesdonk, H. John van, Bebelaar, Dick, Fraanje, Jan, Goubitz, Kees, Schenk, Henk, Brouwer, Albert M., and Verhoeven, Jan W.

Abstract

Donor−acceptor compounds containing a phenylenediamine electron donor and a naphthalene, a cyanobenzene, or a cyanonaphthalene acceptor were studied. The two chromophores are connected by three different bridging units, consisting of CH2 groups linked to a semiflexible piperidine or piperazine ring or to a rigid 2,5-diazabicyclo[2.2.1]heptane group. All donor−acceptor compounds show photoinduced charge separation, resulting in the formation of a compact charge-transfer (CCT) state in nonpolar solvents. The conformational change needed to arrive at this species is impossible in a nonpolar polymer matrix and also in methylcyclohexane at low temperature. In the cases of the piperidine- and piperazine-bridged donor−acceptor compounds, evidence for the involvement of an extended charge-transfer (ECT) species as a precursor of the CCT species was obtained from time-resolved fluorescence measurements. In contrast to harpooning systems studied previously, the energy differences between the species in the present case are so small that their interconversions are reversible within the excited state lifetimes.

Published
2001
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