scholarly journals Ultrafast Hole Deformation Revealed by Molecular Attosecond Interferometry

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Yindong Huang ◽  
Jing Zhao ◽  
Zheng Shu ◽  
Yalei Zhu ◽  
Jinlei Liu ◽  
...  
Keyword(s):  
Wave Packet ◽  
Terahertz Spectroscopy ◽  
Strong Field ◽  
High Harmonic ◽  
Photochemical Reactions ◽  
Pulse Generation ◽  
Joint Measurement ◽  
Electron Wave Packet ◽  
Rotational Wave ◽  
And Control

Understanding the evolution of molecular electronic structures is the key to explore and control photochemical reactions and photobiological processes. Subjected to strong laser fields, electronic holes are formed upon ionization and evolve in the attosecond timescale. It is crucial to probe the electronic dynamics in real time with attosecond-temporal and atomic-spatial precision. Here, we present molecular attosecond interferometry that enables the in situ manipulation of holes in carbon dioxide molecules via the interferometry of the phase-locked electrons (propagating in opposite directions) of a laser-triggered rotational wave packet. The joint measurement on high-harmonic and terahertz spectroscopy (HATS) provides a unique tool for understanding electron dynamics from picoseconds to attoseconds. The optimum phases of two-color pulses for controlling the electron wave packet are precisely determined owing to the robust reference provided with the terahertz pulse generation. It is noteworthy that the contribution of HOMO-1 and HOMO-2 increases reflecting the deformation of the hole as the harmonic order increases. Our method can be applied to study hole dynamics of complex molecules and electron correlations during the strong-field process. The threefold control through molecular alignment, laser polarization, and the two-color pulse phase delay allows the precise manipulation of the transient hole paving the way for new advances in attochemistry.

scholarly journals Reconstruction and control of a time-dependent two-electron wave packet

Nature ◽  
2014 ◽  
Vol 516 (7531) ◽  
pp. 374-378 ◽  
Author(s):  
Christian Ott ◽  
Andreas Kaldun ◽  
Luca Argenti ◽  
Philipp Raith ◽  
Kristina Meyer ◽  
...  
Keyword(s):  
Wave Packet ◽  
Time Dependent ◽  
Electron Wave ◽  
Electron Wave Packet ◽  
And Control

scholarly journals Strong field dynamics with ultrashort electron wave packet replicas

2009 ◽  
Vol 11 (5) ◽  
pp. 053011 ◽  
Author(s):  
Paula Rivière ◽  
Olaf Uhden ◽  
Ulf Saalmann ◽  
Jan M Rost
Keyword(s):  
Wave Packet ◽  
Strong Field ◽  
Electron Wave ◽  
Electron Wave Packet

scholarly journals Strong-field coherent control of isolated attosecond pulse generation

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yudong Yang ◽  
Roland E. Mainz ◽  
Giulio Maria Rossi ◽  
Fabian Scheiba ◽  
Miguel A. Silva-Toledo ◽  
...  
Keyword(s):  
Coherent Control ◽  
Strong Field ◽  
High Harmonic ◽  
Pulse Generation ◽  
Photon Flux ◽  
High Order Harmonic ◽  
Isolated Attosecond Pulse ◽  
Attosecond Pulses ◽  
Waveform Synthesis ◽  
Attosecond Science

AbstractAttosecond science promises to reveal the most fundamental electronic dynamics occurring in matter and it can develop further by meeting two linked technological goals related to high-order harmonic sources: improved spectral tunability (allowing selectivity in addressing electronic transitions) and higher photon flux (permitting to measure low cross-section processes). New developments come through parametric waveform synthesis, which provides control over the shape of field transients, enabling the creation of highly-tunable isolated attosecond pulses via high-harmonic generation. Here we demonstrate that the first goal is fulfilled since central energy, spectral bandwidth/shape and temporal duration of isolated attosecond pulses can be controlled by shaping the laser waveform via two key parameters: the relative-phase between two halves of the multi-octave spanning spectrum, and the overall carrier-envelope phase. These results not only promise to expand the experimental possibilities in attosecond science, but also demonstrate coherent strong-field control of free-electron trajectories using tailored optical waveforms.

scholarly journals High-Harmonic and Terahertz Spectroscopy (HATS): Methods and Applications

2019 ◽  
Vol 9 (5) ◽  
pp. 853 ◽  
Author(s):  
Yindong Huang ◽  
Chao Chang ◽  
Jianmin Yuan ◽  
Zengxiu Zhao
Keyword(s):  
Extreme Ultraviolet ◽  
Terahertz Spectroscopy ◽  
High Harmonic ◽  
Molecular Structures ◽  
Slow Electron ◽  
Electron Dynamics ◽  
Joint Measurement ◽  
X Ray ◽  
Millimeter Wavelength ◽  
High Harmonics

Electrons driven from atom or molecule by intense dual-color laser fields can coherently radiate high harmonics from extreme ultraviolet to soft X-ray, as well as an intense terahertz (THz) wave from millimeter to sub-millimeter wavelength. The joint measurement of high-harmonic and terahertz spectroscopy (HATS) was established and further developed as a unique tool for monitoring electron dynamics of argon from picoseconds to attoseconds and for studying the molecular structures of nitrogen. More insights on the rescattering process could be gained by correlating the fast and slow electron motions via observing and manipulating the HATS from atoms and molecules. We also propose the potential investigations of HATS of polar molecules, and solid and liquid sources.

scholarly journals Strong field dynamics with ultrashort electron wave packet replicas

2009 ◽  
Vol 194 (3) ◽  
pp. 032020
Author(s):  
P Rivière ◽  
O Uhden ◽  
U Saalmann ◽  
J M Rost
Keyword(s):  
Wave Packet ◽  
Strong Field ◽  
Electron Wave ◽  
Electron Wave Packet

scholarly journals Oriented Rotational Wave-Packet Dynamics Studies via High Harmonic Generation

2012 ◽  
Vol 109 (11) ◽  
Author(s):  
E. Frumker ◽  
C. T. Hebeisen ◽  
N. Kajumba ◽  
J. B. Bertrand ◽  
H. J. Wörner ◽  
...  
Keyword(s):  
Wave Packet ◽  
Harmonic Generation ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Wave Packet Dynamics ◽  
Rotational Wave

A Novel Two-phase Soft Starter Used for Three-phase Asynchronous Motors

2020 ◽  
Vol 13 (8) ◽  
pp. 1175-1182
Author(s):  
Jingwen Chen ◽  
Hongshe Dang
Keyword(s):  
Pulse Generation ◽  
Power Module ◽  
Two Phase ◽  
Power Semiconductor ◽  
Starting Current ◽  
Semiconductor Switches ◽  
Soft Starter ◽  
Three Phase ◽  
And Control ◽  
Driving Circuit

Background: Traditional thyristor-based three-phase soft starters of induction motor often suffer from high starting current and heavy harmonics. Moreover, both the trigger pulse generation and driving circuit design are usually complicated. Methods: To address these issues, we propose a novel soft starter structure using fully controlled IGBTs in this paper. Compared to approaches of traditional design, this structure only uses twophase as the input, and each phase is controlled by a power module that is composed of one IGBT and four diodes. Results: Consequently, both driving circuit and control design are greatly simplified due to the requirement of fewer controlled power semiconductor switches, which leads to the reduction of the total cost. Conclusion: Both Matlab/Simulink simulation results and experimental results on a prototype demonstrate that the proposed soft starter can achieve better performances than traditional thyristorbased soft starters for Starting Current (RMS) and harmonics.

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