scholarly journals Characterization of Carrier Cooling Bottleneck in Silicon Nanoparticles by Extreme Ultraviolet (XUV) Transient Absorption Spectroscopy

2021 ◽  
Author(s):  
Ilana J. Porter ◽  
Angela Lee ◽  
Scott K. Cushing ◽  
Hung-Tzu Chang ◽  
Justin C. Ondry ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Silicon Nanoparticles ◽  
Transient Absorption ◽  
Extreme Ultraviolet ◽  
Transient Absorption Spectroscopy

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 Multiphoton Ionization of Nitrobenzene in Non-Aqueous Solutions: Characterization of the Cation and Ion-Molecule Chemistry

1991 ◽  
Vol 11 (2) ◽  
pp. 83-93 ◽  
Author(s):  
G. Siuzdak ◽  
J. J. Belbruno
Keyword(s):  
Aqueous Solutions ◽  
Absorption Spectroscopy ◽  
Ion Mobility ◽  
Transient Absorption ◽  
Multiphoton Ionization ◽  
Transient Absorption Spectroscopy ◽  
Quantum Yields ◽  
Nanosecond Pulses ◽  
Solvent Molecules

The phenoxy cation has been generated in polar and nonpolar solutions by multiphoton ionization of nitrobenzene using nanosecond pulses of 266 nm and 355 nm light. The ions have been characterized by pulsed conductivity (ion mobility) measurements and transient absorption spectroscopy. The involvement of the phenoxy ion in ion-molecule chemistry with either neutral solute or solvent molecules has also been observed and the photochemical products and quantum yields of the ion-molecule products are presented and compared with the neutral photochemistry results.

scholarly journals Coupled valence carrier and core-exciton dynamics in WS2 probed by few-femtosecond extreme ultraviolet transient absorption spectroscopy

2021 ◽  
Vol 104 (6) ◽  
Author(s):  
Hung-Tzu Chang ◽  
Alexander Guggenmos ◽  
Christopher T. Chen ◽  
Juwon Oh ◽  
Romain Géneaux ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Extreme Ultraviolet ◽  
Transient Absorption Spectroscopy ◽  
Exciton Dynamics

scholarly journals In situ characterization of few-cycle laser pulses in transient absorption spectroscopy

2015 ◽  
Vol 40 (15) ◽  
pp. 3464 ◽  
Author(s):  
Alexander Blättermann ◽  
Christian Ott ◽  
Andreas Kaldun ◽  
Thomas Ding ◽  
Veit Stooß ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Laser Pulses ◽  
Transient Absorption Spectroscopy ◽  
In Situ Characterization

scholarly journals Direct Mapping of Curve-Crossing Dynamics in IBr by Attosecond Transient Absorption Spectroscopy

2019 ◽  
Author(s):  
Yuki Kobayashi ◽  
Kristina Chang ◽  
Tao Zeng ◽  
Daniel Neumark ◽  
Stephen Leone
Keyword(s):  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Extreme Ultraviolet ◽  
Transient Absorption Spectroscopy ◽  
Two Photon ◽  
Direct Mapping ◽  
Avoided Crossing ◽  
Iodine Monobromide ◽  
Rapid Switching ◽  
Electronic Character

<p> </p><p>The electronic character of photoexcited molecules can abruptly change at avoided crossings and conical intersections. Here, we report direct mapping of the coupled interplay between electrons and nuclei in a prototype molecule, iodine monobromide (IBr), using attosecond transient absorption spectroscopy. A few-femtosecond visible pulse resonantly excites the B(3_0+) state of IBr and the accompanying photodissociation dynamics are tracked by an attosecond extreme-ultraviolet pulse that simultaneously probes the I-4d and Br-3d corelevel absorption edges. Direct comparison with quantum mechanical simulations unambiguously identifies the core-level absorption features associated with adiabatic and diabatic channels at the B/Y avoided crossing and concurrent two-photon dissociation processes that involve the Y/Z avoided crossing. The results show clear evidence for rapid switching of valence molecularorbital occupations at the avoided crossing.</p> <p><br></p>

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