Investigation of electronically excited indole relaxation dynamics via photoionization and fragmentation pump-probe spectroscopy

2014 ◽  
Vol 141 (4) ◽  
pp. 044314 ◽  
Author(s):  
T. J. Godfrey ◽  
Hui Yu ◽  
Susanne Ullrich
Keyword(s):  
Relaxation Dynamics ◽  
Pump Probe ◽  
Electronically Excited ◽  
Probe Spectroscopy

Quasiparticle relaxation dynamics in underdoped Bi2Sr2CaCu2O8+δby two-color pump-probe spectroscopy

2011 ◽  
Vol 84 (17) ◽  
Author(s):  
Y. Toda ◽  
T. Mertelj ◽  
P. Kusar ◽  
T. Kurosawa ◽  
M. Oda ◽  
...  
Keyword(s):  
Relaxation Dynamics ◽  
Pump Probe ◽  
Quasiparticle Relaxation ◽  
Probe Spectroscopy

scholarly journals Orbital-Dependent Photodynamics of Strongly Correlated Clusters

2021 ◽  
Author(s):  
Jacob Garcia ◽  
Scott Sayres
Keyword(s):  
Theoretical Calculations ◽  
Advanced Materials ◽  
Strongly Correlated ◽  
Relaxation Dynamics ◽  
Pump Probe ◽  
Defect Sites ◽  
Atomic Precision ◽  
Bulk Scale ◽  
Probe Spectroscopy

Understanding the role of defect sites on the mechanism and lifetime of photoexcited state relaxation is critical for the ration-al design of advanced materials. Here, the ultrafast electronic relaxation dynamics of neutral nickel oxide clusters were inves-tigated with femtosecond pump-probe spectroscopy and supported with theoretical calculations to reveal that their excited state lifetimes are strongly dependent on the nature of the electronic transition. Absorption of a UV photon produces short lived (lifetime ~110 fs) dynamics in stoichiometric (NiO)n clusters (n < 6) that are attributed to a ligand to metal charge transfer (LMCT) and produces metallic-like electron-electron scattering. Oxygen vacancies introduce excitations with Ni-3d→Ni-4s and 3d→4p character, which increases the lifetimes of the sub-picosecond response by up to 80% and enables the formation of long-lived (lifetimes > 2.5 ps) states. The atomic precision and tunability of gas phase clusters are employed to highlight a unique reliance on the Ni orbital contributions to the photoexcited lifetimes, providing new insights to the anal-ogous band edge excitation dynamics of strongly correlated bulk-scale NiO materials.

Femtosecond Pump and Probe Spectroscopy on Poly(Para-Phenylenes)

1997 ◽  
Vol 488 ◽  
Author(s):  
W. Graupner ◽  
G. Cerullo ◽  
G. Kranzelbinder ◽  
G. Lanzani ◽  
S. Stagira ◽  
...  
Keyword(s):  
Stimulated Emission ◽  
Excitation Density ◽  
Relaxation Dynamics ◽  
Additional Absorption ◽  
Pump Probe ◽  
Band Emission ◽  
Decay Component ◽  
Pump And Probe ◽  
Ladder Polymer ◽  
Probe Spectroscopy

AbstractWe studied the sub-picosecond dynamics of photoexcitations in methyl-substituted poly(para--phenylene)-type ladder polymer (m-LPPP) films in a wide excitation density range up to values typical for the regime of narrow band emission by pump-probe spectroscopy. The singlet excitons relaxation dynamics, monitored at the stimulated emission (SE) peak at 2.53 eV, showed an intensity dependent ultrafast decay component, which occurs on a sub-picosecond time scale, ascribed to the onset of amplified spontaneous emission (ASE). In addition we identified photoinduced absorption (PA) bands of singlet excitons at 1.48 eV and polarons at 1.9 eV respectively. At high excitation density an additional absorption band becomes evident at 2.63 eV.

Hot carrier relaxation dynamics in In0.53Ga0.47As studied by femtosecond pump–probe spectroscopy

1999 ◽  
Vol 83-84 ◽  
pp. 49-53 ◽  
Author(s):  
D Nishiwaki ◽  
Y Hamanaka ◽  
Y Nonogaki ◽  
Y Fujiwara ◽  
Y Takeda ◽  
...  
Keyword(s):  
Relaxation Dynamics ◽  
Carrier Relaxation ◽  
Pump Probe ◽  
Hot Carrier ◽  
Probe Spectroscopy ◽  
Carrier Relaxation Dynamics

scholarly journals Excited-State Vibration-Polariton Transitions and Dynamics in Nitroprusside

2020 ◽  
Author(s):  
Andrea B. Grafton ◽  
Adam D. Dunkelberger ◽  
Blake S. Simpkins ◽  
Johan F. Triana ◽  
Federico J. Hernandez ◽  
...  
Keyword(s):  
Relaxation Dynamics ◽  
Pump Probe ◽  
Chemical Reaction Kinetics ◽  
Excited Vibration ◽  
Rabi Model ◽  
Cavity Coupling ◽  
Multi Level ◽  
Spectroscopic Signatures ◽  
Probe Spectroscopy ◽  
Product Branching

<div> <div> <div> <p>Strong cavity coupling to molecular vibrations creates vibration-polaritons capable of modifying chemical reaction kinetics, product branching ratios, and charge transfer equilibria. However, the mechanisms impacting these molecular processes remain elusive. Furthermore, even basic elements determining the spectral properties of polaritons, such as selection rules, transition moments, and lifetimes, are poorly understood. Here, we use two-dimensional infrared and filtered pump–probe spectroscopy to report clear spectroscopic signatures and relaxation dynamics of excited vibration-polaritons formed from the cavity- coupled NO band of nitroprusside. We apply a multi-level quantum Rabi model that predicts transition frequencies and strengths that agree very well with our experiment. Notably, the polariton features decay ~3-4 times slower than the polariton dephasing time, indicating that they support incoherent population, a consequence of their partial matter character. Understanding the factors determining polariton population and dephasing lifetimes will impact polariton-modified energy transfer, photophysics, and chemistry. </p> </div> </div> </div>

scholarly journals Femtosecond pump-probe spectroscopy of intersubband relaxation dynamics in narrow InGaAs∕AlAsSb quantum well structures

2006 ◽  
Vol 89 (17) ◽  
pp. 171104 ◽  
Author(s):  
C. V.-B. Tribuzy ◽  
S. Ohser ◽  
S. Winnerl ◽  
J. Grenzer ◽  
H. Schneider ◽  
...  
Keyword(s):  
Quantum Well ◽  
Relaxation Dynamics ◽  
Pump Probe ◽  
Quantum Well Structures ◽  
Probe Spectroscopy ◽  
Intersubband Relaxation

Ultrafast Proton-Transfer and Coherent Wavepacket Motion of Electronically Excited 1,8-Dihydroxyanthraquinone in Liquid Benzyl Alcohol Solution

2000 ◽  
Vol 214 (10) ◽  
Author(s):  
J. Jethwa ◽  
D. Ouw ◽  
K. Winkler ◽  
N. Hartmann ◽  
P. Vöhringer
Keyword(s):  
Proton Transfer ◽  
Transfer Reaction ◽  
Liquid Solution ◽  
Proton Transfer Reaction ◽  
Alcohol Solution ◽  
Relaxation Dynamics ◽  
Radiative Relaxation ◽  
Pump Probe ◽  
Electronically Excited ◽  
Minimum Potential

Ultrafast pump-probe experiments with a time-resolution of 30 fs have been carried out to explore the non-radiative relaxation dynamics of electronically excited 1,8-dihydroxyanthraquinone (DHAQ) in polar liquid solution. The results are discussed in terms of a Lippincott-Schroeder double-minimum potential along the proton-transfer reaction coordinate for the ground (S

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