Interexciton nonradiative relaxation pathways in the peridinin-chlorophyll protein

Tilluck, Ryan W.; Ghosh, Soumen; Guberman‐Pfeffer, Matthew J.; Roscioli, Jerome D.; Gurchiek, Jason K.; LaFountain, Amy M.; Frank, Harry A.; Gascón, José A.; Beck, Warren F.

doi:10.1016/j.xcrp.2021.100380

Cited by 10 publications

(12 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Femtosecond Spectroscopy . 2DES spectra were recorded using a pump–probe optical configuration with adaptive pulse shaping as discussed previously . Excitation pulses (6.8 fs, 100 kHz repetition rate) were obtained from a noncollinear optical parametric amplifier and compressed by chirped mirror pairs and a pulse shaper in each beam.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…2DES spectra were recorded using a pump−probe optical configuration with adaptive pulse shaping 33 as discussed previously. 13 Excitation pulses (6.8 fs, 100 kHz repetition rate) were obtained from a noncollinear optical parametric amplifier and compressed by chirped mirror pairs and a pulse shaper in each beam. Residual phase plots, a SHG-FROG spectrogram, and an interferometric autocorrelation measured by the pulse shapers are provided in Figures S3−S6.…”

Section: ■ Experimental Methodsmentioning

confidence: 99%

“…2DES experiments with these HDA-liganded QDs were carried out at room temperature (23 °C) as described previously with a pump–probe optical configuration incorporating adaptive pulse shapers in both the pump and probe beams . The intensity spectrum of the 6.8 fs excitation pulses spans the lowest four exciton absorption transitions, X1–X4, which allows us to monitor nonradiative relaxation pathways between these states in parallel in the same experiment.…”

mentioning

confidence: 99%

“…2DES experiments with these HDA-liganded QDs were carried out at room temperature (23 °C) as described previously with a pump−probe optical configuration incorporating adaptive pulse shapers in both the pump and probe beams. 13 The intensity spectrum of the 6.8 fs excitation pulses spans the lowest four exciton absorption transitions, X1−X4, which allows us to monitor nonradiative relaxation pathways between these states in parallel in the same experiment. As The signal line shapes are initially sharper in the 2DES spectrum than in the linear absorption spectrum (Figure 1F) owing to partial relief from inhomogeneous broadening at delays T shorter than the electronic dephasing time.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Vibronic Excitons and Conical Intersections in Semiconductor Quantum Dots

Tilluck

Hetherington

et al. 2021

J. Phys. Chem. Lett.

Self Cite

View full text Add to dashboard Cite

Surface defects and organic surface-capping ligands affect the photoluminescence properties of semiconductor quantum dots (QDs) by altering the rates of competing nonradiative relaxation processes. In this study, broadband two-dimensional electronic spectroscopy reveals that absorption of light by QDs prepares vibronic excitons, excited states derived from quantum coherent mixing of the core electronic and ligand vibrational states. Rapidly damped coherent wavepacket motions of the ligands are observed during hot-carrier cooling, with vibronic coherence transferred to the photoluminescent state. These findings suggest a many-electron, molecular theory for the electronic structure of QDs, which is supported by calculations of the structures of conical intersections between the exciton potential surfaces of a small ammonia-passivated model CdSe nanoparticle.

show abstract

Section: Experimental Methodsmentioning

confidence: 99%

Section: ■ Experimental Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Vibronic Excitons and Conical Intersections in Semiconductor Quantum Dots

Tilluck

Hetherington

et al. 2021

J. Phys. Chem. Lett.

Self Cite

View full text Add to dashboard Cite

show abstract

“…In PCP, there is a 4:1 peridinin (Per) to Chl a ratio. The biological role of PCP is to funnel excitation energy through paths connecting the four peridinins, ending in a localized exciton on Chl a [ 22 , 23 ]. Per–Per–Per and Per–Chl couplings range between ~200 cm −1 and ~600 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

Spectral Features of Canthaxanthin in HCP2. A QM/MM Approach

et al. 2021

Self Cite

View full text Add to dashboard Cite

The increased interest in sequencing cyanobacterial genomes has allowed the identification of new homologs to both the N-terminal domain (NTD) and C-terminal domain (CTD) of the Orange Carotenoid Protein (OCP). The N-terminal domain homologs are known as Helical Carotenoid Proteins (HCPs). Although some of these paralogs have been reported to act as singlet oxygen quenchers, their distinct functional roles remain unclear. One of these paralogs (HCP2) exclusively binds canthaxanthin (CAN) and its crystal structure has been recently characterized. Its absorption spectrum is significantly red-shifted, in comparison to the protein in solution, due to a dimerization where the two carotenoids are closely placed, favoring an electronic coupling interaction. Both the crystal and solution spectra are red-shifted by more than 50 nm when compared to canthaxanthin in solution. Using molecular dynamics (MD) and quantum mechanical/molecular mechanical (QM/MM) studies of HCP2, we aim to simulate these shifts as well as obtain insight into the environmental and coupling effects of carotenoid–protein interactions.

show abstract

Intramolecular charge transfer and the function of vibronic excitons in photosynthetic light harvesting

Beck

2024

Photosynth Res

View full text Add to dashboard Cite

Interexciton nonradiative relaxation pathways in the peridinin-chlorophyll protein

Cited by 10 publications

References 44 publications

Vibronic Excitons and Conical Intersections in Semiconductor Quantum Dots

Vibronic Excitons and Conical Intersections in Semiconductor Quantum Dots

Spectral Features of Canthaxanthin in HCP2. A QM/MM Approach

Intramolecular charge transfer and the function of vibronic excitons in photosynthetic light harvesting

Contact Info

Product

Resources

About