scholarly journals Advances in laboratory-scale ptychography using high harmonic sources

2021 ◽  
Author(s):  
Lars Loetgering ◽  
Stefan Witte ◽  
Jan Rothhardt
Keyword(s):  
High Harmonic ◽  
Laboratory Scale

Submicron imaging in the EUV spectral range using high-harmonic radiation

2003 ◽  
Vol 104 ◽  
pp. 149-152 ◽  
Author(s):  
M. Wieland ◽  
R. Früke ◽  
T. Wilhein ◽  
U. Kleineberg ◽  
M. Pohl ◽  
...  
Keyword(s):  
Spectral Range ◽  
High Harmonic ◽  
Harmonic Radiation

EVALUATION OF A LABORATORY-SCALE HYBRID ROCKET ENGINE'S PERFORMANCE

2014 ◽  
Vol 13 (2) ◽  
pp. 123-139
Author(s):  
V. Brahmbhatt ◽  
David R. Greatrix ◽  
J. Karpynczyk ◽  
A. P. Trumpour
Keyword(s):  
Laboratory Scale ◽  
Hybrid Rocket

Compact and Laboratory―Scale Calendering Unit

2015 ◽  
Vol 69 (2) ◽  
pp. 131-134
Author(s):  
Masaru Futaba
Keyword(s):  
Laboratory Scale

The Interplay of Open-Shell Spin-Coupling and Jahn-Teller Distortion in Benzene Radical Cation Probed by X-ray Spectroscopy

2020 ◽  
Author(s):  
Marta L. Vidal ◽  
Michael Epshtein ◽  
Valeriu Scutelnic ◽  
Zheyue Yang ◽  
Tian Xue ◽  
...  
Keyword(s):  
High Harmonic ◽  
Open Shell ◽  
Spin Coupling ◽  
High Symmetry ◽  
Teller Distortion ◽  
Spectral Window ◽  
X Ray ◽  
Jahn Teller ◽  
X Ray Absorption ◽  
Jahn Teller Distortion

We report a theoretical investigation and elucidation of the x-ray absorption spectra of neutral benzene and of the benzene cation. The generation of the cation by multiphoton ultraviolet (UV) ionization as well as the measurement of<br>the carbon K-edge spectra of both species using a table-top high-harmonic generation (HHG) source are described in the companion experimental paper [M. Epshtein et al., J. Phys.<br>Chem. A., submitted. Available on ChemRxiv]. We show that the 1sC -> pi transition serves as a sensitive signature of the transient cation formation, as it occurs outside of the spectral window of the parent neutral species. Moreover, the presence<br>of the unpaired (spectator) electron in the pi-subshell of the cation and the high symmetry of the system result in significant differences relative to neutral benzene in the spectral features associated with the 1sC ->pi* transitions. High-level calculations using equation-of-motion coupled-cluster theory provide the interpretation of the experimental spectra and insight into the electronic structure of benzene and its cation.<br>The prominent split structure of the 1sC -> pi* band of the cation is attributed to the interplay between the coupling of the core -> pi* excitation with the unpaired electron<br>in the pi-subshell and the Jahn-Teller distortion. The calculations attribute most of<br>the splitting (~1-1.2 eV) to the spin coupling, which is visible already at the Franck-Condon structure, and estimate the additional splitting due to structural relaxation to<br>be around ~0.1-0.2 eV. These results suggest that x-ray absorption with increased resolution might be able to disentangle electronic and structural aspects of the Jahn-Teller<br>effect in benzene cation.<br>

Generalized Heterodyne Configurations for Photo-induced Force Microscopy

2019 ◽  
Author(s):  
Le Wang ◽  
Devon Jakob ◽  
Haomin Wang ◽  
Alexis Apostolos ◽  
Marcos M. Pires ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Repetition Rate ◽  
Modulation Frequency ◽  
High Harmonic ◽  
Chemical Imaging ◽  
Heterodyne Detection ◽  
Force Microscopy ◽  
Wide Range ◽  
The Difference ◽  
Afm Cantilever

<div>Infrared chemical microscopy through mechanical probing of light-matter interactions by atomic force microscopy (AFM) bypasses the diffraction limit. One increasingly popular technique is photo-induced force microscopy (PiFM), which utilizes the mechanical heterodyne signal detection between cantilever mechanical resonant oscillations and the photo induced force from light-matter interaction. So far, photo induced force microscopy has been operated in only one heterodyne configuration. In this article, we generalize heterodyne configurations of photoinduced force microscopy by introducing two new schemes: harmonic heterodyne detection and sequential heterodyne detection. In harmonic heterodyne detection, the laser repetition rate matches integer fractions of the difference between the two mechanical resonant modes of the AFM cantilever. The high harmonic of the beating from the photothermal expansion mixes with the AFM cantilever oscillation to provide PiFM signal. In sequential heterodyne detection, the combination of the repetition rate of laser pulses and polarization modulation frequency matches the difference between two AFM mechanical modes, leading to detectable PiFM signals. These two generalized heterodyne configurations for photo induced force microscopy deliver new avenues for chemical imaging and broadband spectroscopy at ~10 nm spatial resolution. They are suitable for a wide range of heterogeneous materials across various disciplines: from structured polymer film, polaritonic boron nitride materials, to isolated bacterial peptidoglycan cell walls. The generalized heterodyne configurations introduce flexibility for the implementation of PiFM and related tapping mode AFM-IR, and provide possibilities for additional modulation channel in PiFM for targeted signal extraction with nanoscale spatial resolution.</div>

Validation of the Theoretical Model for Dimensioning the Propellant Characteristics in a Laboratory Scale Hybrid Rocket Motor Bench

2020 ◽  
Author(s):  
Rodrigo De Melo Silveira ◽  
Isabel Matos ◽  
Lia Pimont ◽  
Paula Cristina Fernandes ◽  
Leonardo Henrique Gouvêa ◽  
...  
Keyword(s):  
Theoretical Model ◽  
Rocket Motor ◽  
Laboratory Scale ◽  
Hybrid Rocket ◽  
Hybrid Rocket Motor
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