Výsledky vyhledávání - "Ricky Teiwes"

Tuning fast excited-state decay by ligand attachment in isolated chlorophyll a

Autor: Elisabeth Gruber, Ricky Teiwes, Christina Kjær, Steen Brøndsted Nielsen, Lars H. Andersen

Publikováno v: Gruber, E, Teiwes, R, Kjær, C, Brøndsted Nielsen, S & Andersen, L H 2022, ' Tuning fast excited-state decay by ligand attachment in isolated chlorophylla ', Physical Chemistry Chemical Physics, vol. 24, no. 1, pp. 149-155 . https://doi.org/10.1039/d1cp04356k

Excited-state dynamics plays a key role for light harvesting and energy transport in photosynthetic proteins but it is nontrivial to separate the intrinsic photophysics of the light-absorbers (chlorophylls) from interactions with the protein matrix.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::43fc97e4edf207fe0e1595baca27d6e8
https://doi.org/10.1039/d1cp04356k

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An electron–ion coincidence spectrometer for commissioning of a synchrotron radiation beamline: Absolute photon intensity and content of higher harmonic radiation

Autor: Henrik B. Pedersen, Sofie J. Lanng, Björn Bastian, Lasse S. Harbo, Søren V. Hoffmann, Nykola C. Jones, Marcel Mudrich, Torsten A. Nielsen, Annette Svendsen, Ricky Teiwes

Publikováno v: Pedersen, H B, Lanng, S J, Bastian, B, Harbo, L S, Hoffmann, S V, Jones, N C, Mudrich, M, Nielsen, T A, Svendsen, A & Teiwes, R 2023, ' An electron–ion coincidence spectrometer for commissioning of a synchrotron radiation beamline: Absolute photon intensity and content of higher harmonic radiation ', Review of Scientific Instruments, vol. 94, 053102 . https://doi.org/10.1063/5.0147173

We describe the commissioning of a new electron–ion coincidence spectrometer used to diagnose the photon beam from a plane grating monochromator beamline at the ASTRID2 synchrotron radiation facility. The spectrometer allows determination of the ab

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::46f914224fe65d9cd4221f926fce8bc8
https://pure.au.dk/ws/files/320713129/RSI23_AR_00295.pdf

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On the temperature of large biomolecules in ion-storage rings

Autor: Anne P. Rasmussen, Ricky Teiwes, Dilara A. Farkhutdinova, Anastasia V. Bochenkova, Lars H. Andersen

Publikováno v: Rasmussen, A P, Teiwes, R, Farkhutdinova, D A, Bochenkova, A V & Andersen, L H 2022, ' On the temperature of large biomolecules in ion-storage rings ', European Physical Journal D, vol. 76, no. 5, 76 . https://doi.org/10.1140/epjd/s10053-022-00400-y

A method to determine the temperature of molecular ions in an ion-storage ring is presented. Molecular ions were repeatedly irradiated by laser pulses over several hundred milliseconds, and the rate of fragmentation was used to determine the temperat

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b7ef2d44fe28b3de81c238baae824ed4
https://doi.org/10.1140/epjd/s10053-022-00400-y

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Light Driven Ultrafast Bioinspired Molecular Motors: Steering and Accelerating Photoisomerization Dynamics of Retinal

Autor: Elisabeth Gruber, Adil M. Kabylda, Mogens Brøndsted Nielsen, Anne P. Rasmussen, Ricky Teiwes, Pavel A. Kusochek, Anastasia V. Bochenkova, Lars H. Andersen

Publikováno v: Gruber, E, Kabylda, A M, Nielsen, M B, Rasmussen, A P, Teiwes, R, Kusochek, P A, Bochenkova, A V & Andersen, L H 2022, ' Light Driven Ultrafast Bioinspired Molecular Motors : Steering and Accelerating Photoisomerization Dynamics of Retinal ', Journal of the American Chemical Society, vol. 144, no. 1, pp. 69-73 . https://doi.org/10.1021/jacs.1c10752

Photoisomerization of retinal protonated Schiff base in microbial and animal rhodopsins are strikingly ultrafast and highly specific. Both protein environments provide conditions for fine-tuning the photochemistry of their chromophores. Here, by comb

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::41aafa575510730e7a74b5b0522e6166
https://pubmed.ncbi.nlm.nih.gov/34958197

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Spectroscopy and photoisomerization of protonated Schiff-base retinal derivatives in vacuo

Autor: Ricky Teiwes, Mordechai Sheves, Anne Pilgaard Rasmussen, Elisabeth Gruber, Lars H. Andersen

Publikováno v: Rasmussen, A P, Gruber, E, Teiwes, R, Sheves, M & Andersen, L H 2021, ' Spectroscopy and photoisomerization of protonated Schiff-base retinal derivatives in vacuo ', Physical Chemistry Chemical Physics, vol. 23, no. 48, pp. 27227-27233 . https://doi.org/10.1039/d1cp04501f

The protonated Schiff-base retinal acts as the chromophore in bacteriorhodopsin as well as in rhodopsin. In both cases, photoexcitation initializes fast isomerization which eventually results in storage of chemical energy or signaling. The details of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::27a320cb698de577b86e583d8e988fb9
https://pure.au.dk/portal/da/publications/spectroscopy-and-photoisomerization-of-protonated-schiffbase-retinal-derivatives-in-vacuo(1d3a3e6f-832c-4571-be16-bfb7cffa51ab).html

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Factor analysis of chemical ionization experiments: Numerical simulations and an experimental case study of the ozonolysis of α-pinene using a PTR-ToF-MS

Autor: Marianne Glasius, Ricky Teiwes, Henrik B. Pedersen, Kasper Kristensen, Merete Bilde, Bernadette Rosati, Rossana Bossi, Henrik Skov

Publikováno v: Atmospheric Environment. 199:15-31

In this study we examine the application of a factor analysis technique for datasets recorded by the chemical ionization instrument Proton Transfer Reaction - Time-of-Flight - Mass Spectrometer (PTR-ToF-MS). Numerical simulations were carried out to

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::20ad6ed4c645be630491af5e6a8fedb8
https://doi.org/10.1016/j.atmosenv.2018.11.012

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The reaction of isotope-substituted hydrated iodide I(HO)

Autor: Henrik B, Pedersen, Jonas, Elm, Christian H, Frederiksen, Simon P S, Jessen, Ricky, Teiwes, Merete, Bilde

Publikováno v: Physical chemistry chemical physics : PCCP. 22(34)

We report an investigation of the reaction of isotope-substituted hydrated iodide I(HO)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::b871a73e96050d068e887b43ff8d3cad
https://pubmed.ncbi.nlm.nih.gov/32814937

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Temperature and VOC concentration as controlling factors for chemical composition of alpha-pinene derived secondary organic aerosol

Autor: Mikael Ehn, Merete Bilde, Ricky Teiwes, Kasper Kristensen, Henrik B. Pedersen, Louise N. Jensen, Lauriane L. J. Quéléver, Marianne Glasius, Bernadette Rosati, Manjula R. Canagaratna

This work investigates the individual and combined effects of temperature and volatile organic compound precursor concentration on the chemical composition of particles formed in the dark ozonolysis of α-pinene. All experiments were conducted in a 5

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0ae5903c0e68b976f394b4dc2ba9bd98
https://www.atmos-chem-phys-discuss.net/acp-2020-100/

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