scholarly journals There is Plenty of Room for THz Tunneling Electron Devices Beyond the Transit Time Limit

2021 ◽  
pp. 1-1
Author(s):  
Matteo Villani ◽  
Simone Clochiatti ◽  
Werner Prost ◽  
Nils Weimann ◽  
Xavier Oriols
Keyword(s):  
Transit Time ◽  
Time Limit ◽  
Tunneling Electron ◽  
Electron Devices

scholarly journals Approaching the transit time limit for high-precision spectroscopy on metastable CO around 6 μm

2019 ◽  
Vol 21 (44) ◽  
pp. 24506-24511 ◽  
Author(s):  
D. D'Ambrosio ◽  
S. Borri ◽  
M. Verde ◽  
A. Borgognoni ◽  
G. Insero ◽  
...  
Keyword(s):  
High Resolution ◽  
Line Width ◽  
High Precision ◽  
Transit Time ◽  
Molecular Beam ◽  
Time Limit ◽  
High Resolution Spectroscopy ◽  
Precision Spectroscopy ◽  
Spectroscopy Experiment ◽  
Measured Line

We present a high-resolution spectroscopy experiment, based on a molecular beam setup, which pushes the measured line width close to the transit time limit, on the order of 100 kHz.

scholarly journals The fast transit-time limit of magnetic pumping with trapped electrons

2021 ◽  
Vol 87 (6) ◽  
Author(s):  
J. Egedal ◽  
E. Lichko
Keyword(s):  
Magnetic Field ◽  
Transit Time ◽  
Kinetic Equations ◽  
Nonlinear Effects ◽  
Time Limit ◽  
Superthermal Electrons ◽  
Pressure Anisotropy ◽  
Magnetic Perturbations ◽  
Field Lines ◽  
The Magnetic Field

Recently, the energization of superthermal electrons at the Earth's bow shock was found to be consistent with a new magnetic pumping model derived in the limit where the electron transit time is much shorter than any time scale governing the evolution of the magnetic fields. The new model breaks with the common approach of integrating the kinetic equations along unperturbed orbits. Rather, the fast transit-time limit allows the electron dynamics to be characterized by adiabatic invariants (action variables) accurately capturing the nonlinear effects of electrons becoming trapped in magnetic perturbations. Without trapping, fast parallel streaming along magnetic field lines causes the electron pressure to be isotropized and homogeneous along the magnetic field lines. In contrast, trapping permits spatially varying pressure anisotropy to form along the magnetic field lines, and through a Fermi process this pressure anisotropy in turn becomes the main ingredient that renders magnetic pumping efficient for energizing superthermal electrons. We here present a detailed mathematical derivation of the model.

Cerebral vascular mean transit time determined by PET and DSC-MRI

2005 ◽  
Vol 25 (1_suppl) ◽  
pp. S676-S676
Author(s):  
Masanobu Ibaraki ◽  
Hiroshi Ito ◽  
Eku Shimosegawa ◽  
Hideto Toyoshima ◽  
Keiichi Ishigame ◽  
...  
Keyword(s):  
Transit Time ◽  
Mean Transit Time ◽  
Dsc Mri ◽  
Cerebral Vascular

Transit-time effects in saturated absorption resonances

1986 ◽  
Vol 47 (12) ◽  
pp. 2025-2039 ◽  
Author(s):  
A. Titov ◽  
Yu. Malyshev ◽  
Yu. Rastorguev
Keyword(s):  
Transit Time ◽  
Time Effects ◽  
Saturated Absorption
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