Nikolaj Klinkby

20259043

Simon Wall, Naman Agarwal, Shreya Bagchi, Gabriele Bartolini et autres

Author response for "Spectroscopy of Cryogenic Protonated Schiff-Base Retinal Derivatives"

Nikolaj Klinkby, Anne P. Rasmussen, Anders G. S. Lauridsen, Mordechai Sheves et autres

Dipole-bound states in the meta form of the green fluorescent protein chromophore observed by cryogenic action spectroscopy

Anne P. Rasmussen, Nikolaj Klinkby, Lars H. Andersen

. Complementary DFT (ωB97X-D/aug-cc-pVTZ) calculations provide insight into the structure and vibrational resonances of the excess electron in this biologically relevant chromophore. The results extend the understanding of dipole-bound and resonance states in complex molecular systems. We find that one low-energy mode …

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Spectroscopy of cryogenic protonated Schiff-base retinal derivatives

Nikolaj Klinkby, Anne P. Rasmussen, Anders G. S. Lauridsen, Mordechai Sheves et autres

Retinal protonated Schiff base (RPSB) is the active chromophore in opsin proteins, including rhodopsin for vision. Yet, the spectral consequences of geometric constraints imposed by the protein environment remain insufficiently characterised. We report on gas-phase action-absorption spectra of six retinal analogues with …

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Cryogenic Ion Spectroscopy of the Ortho Green Fluorescent Protein Chromophore Anion

Thomas Toft Lindkvist, Anne P. Rasmussen, Nikolaj Klinkby, Lars H. Andersen et autres

Engineering new fluorescent probes, such as fluorescent proteins, requires a firm understanding of factors governing chromophore photophysics. Here we study o -HBDI –, a derivative of the green fluorescent protein chromophore anion where the phenolate oxygen is shifted from the para to …

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A versatile setup for symmetry-resolved ultrafast dynamics of quantum materials

Khalid M. Siddiqui, Hanna Strojecka, Thomas H. Meyland, Nitesh Khatiwada et autres

Correlated phenomena occur in quantum materials because of the delicate interplay between internal degrees of freedom, leading to multiple symmetry-broken quantum phases. Resolving the structure of these phases is a key challenge, often requiring facilities equipped with x-ray free-electron lasers and electron …

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Valence ( S 1 ) and nonvalence (dipole-bound) spectroscopy of chromophore models of the photoactive yellow protein probed by cryogenic action spectroscopy

Lars H. Andersen, Anne P. Rasmussen, Henrik B. Pedersen, Nikolaj Klinkby

The authors present a high-resolution spectroscopic characterization of deprotonated para-coumaric acids, probing specifically electronic excitations near threshold. The results provide insight into the dynamics of electron capture and release in dipole-bound systems, relevant for modeling processes in both interstellar environments and biological …

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Author response for "Conformer specific photophysical properties of an analog of the green fluorescent protein chromophore anion †"

Anders G. S. Lauridsen, Anne P. Rasmussen, Nikolaj Klinkby, Lars H. Andersen

Time-Resolved Cryogenic Action Spectroscopy of Dipole-Bound States in Phenoxide

Lars H. Andersen, Anne P. Rasmussen, Henrik B. Pedersen, Nikolaj Klinkby

Dipole-bound states of cryogenically cooled phenoxide anions (deprotonated phenol) have been investigated by combining trapping in a 6 K ion trap and subsequent action-absorption spectroscopy in an ion-storage ring. As action we consider creation of neutral phenoxy radicals. A multitude of dipole-bound …

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Photophysics of a Methylated GFP Chromophore Anion in Vacuo

Thomas Toft Lindkvist, Christian Sillesen, Nikolaj Klinkby, Henrik Helligsø Jensen et autres

The photophysical properties of the isolated chromophore anion from the green fluorescent protein have been extensively studied over the years to understand the factors influencing transition energies, excited-state lifetimes, and fluorescence. A commonly used model for the protein chromophore is 4′-hydroxybenzylidene-2,3-dimethyl-imidazolinone ( …

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Front Cover: Absorption and Excited‐State Coherences of Cryogenically Cold Retinal Protonated Schiff Base in Vacuo (ChemPhysChem 3/2025)

Nikolaj Klinkby, Anne P. Rasmussen, Anders G. S. Lauridsen, Lars H. Andersen

The Front Cover shows light interacting with a rhodopsin protein in the eye. Upon photoabsorption, the retinal chromophore inside the protein isomerizes. The impact of the protein environment on the active vibrations of the retinal chromophore during photoabsorption is still not well …

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Conformer specific photophysical properties of an analog of the green fluorescent protein chromophore anion

Anders G. S. Lauridsen, Anne Rasmussen, Nikolaj Klinkby, Lars H. Andersen

The spectroscopy and dynamics of two modified GFP-chromophore anions are studied at cryogenic temperature, revealing both different decays and vibrational fingerprints in S 1 .

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