scholarly journals Ultrafast carrier thermalization and trapping in silicon-germanium alloy probed by extreme ultraviolet transient absorption spectroscopy

2017 ◽  
Vol 4 (4) ◽  
pp. 044029 ◽  
Author(s):  
Michael Zürch ◽  
Hung-Tzu Chang ◽  
Peter M. Kraus ◽  
Scott K. Cushing ◽  
Lauren J. Borja ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Silicon Germanium ◽  
Transient Absorption ◽  
Extreme Ultraviolet ◽  
Transient Absorption Spectroscopy ◽  
Ultrafast Carrier ◽  
Germanium Alloy ◽  
Carrier Thermalization

scholarly journals Symmetry of molecular Rydberg states revealed by XUV transient absorption spectroscopy

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Peng Peng ◽  
Claude Marceau ◽  
Marius Hervé ◽  
P. B. Corkum ◽  
A. Yu. Naumov ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Extreme Ultraviolet ◽  
Rydberg States ◽  
Transient Absorption Spectroscopy ◽  
Electronic Transitions ◽  
Final States ◽  
Polarization Direction ◽  
Quasibound State

AbstractTransient absorption spectroscopy is utilized extensively for measurements of bound- and quasibound-state dynamics of atoms and molecules. The extension of this technique into the extreme ultraviolet (XUV) region with attosecond pulses has the potential to attain unprecedented time resolution. Here we apply this technique to aligned-in-space molecules. The XUV pulses are much shorter than the time during which the molecules remain aligned, typically $$<$$<100 fs. However, transient absorption is not an instantaneous probe, because long-lived coherences re-emit for picoseconds to nanoseconds. Due to dephasing of the rotational wavepacket, it is not clear if these coherences will be evident in the absorption spectrum, and whether the properties of the initial excitations will be preserved. We studied Rydberg states of N$${}_{2}$$2 and O$${}_{2}$$2 from 12 to 23 eV. We were able to determine the polarization direction of the electronic transitions, and hence identify the symmetry of the final states.

scholarly journals Tracking dissociation dynamics of strong-field ionized 1,2-dibromoethane with femtosecond XUV transient absorption spectroscopy

2016 ◽  
Vol 18 (21) ◽  
pp. 14644-14653 ◽  
Author(s):  
Adam S. Chatterley ◽  
Florian Lackner ◽  
Daniel M. Neumark ◽  
Stephen R. Leone ◽  
Oliver Gessner
Keyword(s):  
Absorption Spectroscopy ◽  
Near Infrared ◽  
Transient Absorption ◽  
Extreme Ultraviolet ◽  
Strong Field ◽  
Transient Absorption Spectroscopy ◽  
Time Resolved ◽  
Strong Field Ionization ◽  
Dissociation Dynamics ◽  
Ultraviolet Absorption Spectroscopy

Using femtosecond time-resolved extreme ultraviolet absorption spectroscopy, the dissociation dynamics of the haloalkane 1,2-dibromoethane (DBE) have been explored following strong field ionization by femtosecond near infrared pulses at intensities between 7.5 × 1013 and 2.2 × 1014 W cm−2.

scholarly journals Bromine substitution improves excited-state dynamics in mesoporous mixed halide perovskite films

Nanoscale ◽  
2017 ◽  
Vol 9 (33) ◽  
pp. 12005-12013 ◽  
Author(s):  
Eric M. Talbert ◽  
Holly F. Zarick ◽  
Abdelaziz Boulesbaa ◽  
Naiya Soetan ◽  
Alexander A. Puretzky ◽  
...  
Keyword(s):  
Excited State ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Carrier Dynamics ◽  
Transient Absorption Spectroscopy ◽  
Excited State Dynamics ◽  
Halide Perovskites ◽  
Halide Perovskite ◽  
Carrier Thermalization ◽  
The Impact

This study investigates the impact of Br substitution on the carrier dynamics in mixed halide perovskites using ultrafast transient absorption spectroscopy, revealing faster carrier thermalization lifetimes with increasing Br content.

Ultrafast carrier dynamics of carbon nanodots in different pH environments

2016 ◽  
Vol 18 (5) ◽  
pp. 3838-3845 ◽  
Author(s):  
Laizhi Sui ◽  
Wuwei Jin ◽  
Suyu Li ◽  
Dunli Liu ◽  
Yuanfei Jiang ◽  
...  
Keyword(s):  
Steady State ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Surface States ◽  
Carrier Dynamics ◽  
Transient Absorption Spectroscopy ◽  
Carboxyl Groups ◽  
Carbon Nanodots ◽  
Ultrafast Carrier Dynamics ◽  
Ultrafast Carrier

The carboxyl groups in C-dots greatly influence PL of C-dots as emissive surface states based on steady-state and transient absorption spectroscopy.

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