Double-layer formation in the extended Franck-Hertz experiment

Nicoletopoulos, Pierre

doi:10.1103/physreve.78.026403

Cited by 3 publications

(1 citation statement)

References 35 publications

(2 reference statements)

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“…In Ref. [10] the experimental conditions were optimized for the measurements of the critical potentials of mercury, while in a subsequent paper [11], an analytical theory was developed that explained the prominent features, including the double-layer formation, in the extended Franck-Hertz experiment.…”

Section: Introductionmentioning

confidence: 99%

Photoelectric Franck-Hertz experiment and its kinetic analysis by Monte Carlo simulation

Magyar

Korolov

2012

Phys. Rev. E

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The electrical characteristics of a photoelectric Franck-Hertz cell are measured in argon gas over a wide range of pressure, covering conditions where elastic collisions play an important role, as well as conditions where ionization becomes significant. Photoelectron pulses are induced by the fourth harmonic UV light of a diode-pumped Nd:YAG laser. The electron kinetics, which is far more complex compared to the naive picture of the Franck-Hertz experiment, is analyzed via Monte Carlo simulation. The computations provide the electrical characteristics of the cell, the energy and velocity distribution functions, and the transport parameters of the electrons, as well as the rate coefficients of different elementary processes. A good agreement is obtained between the cell's measured and calculated electrical characteristics, the peculiarities of which are understood by the simulation studies.

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Section: Introductionmentioning

confidence: 99%

Photoelectric Franck-Hertz experiment and its kinetic analysis by Monte Carlo simulation

Magyar

Korolov

2012

Phys. Rev. E

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The Effects of Pressure on the Structural, Electronic, and Lattice Dynamical Properties of FeSe Superconductor

Wang

Wei

et al. 2014

J Low Temp Phys

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Motivated by the experimental huge enhancement of the superconducting transition temperature T c in FeSe superconductor under high pressure, we perform first-principles calculations of the evolutions of structural, electronic, and lattice dynamical properties of FeSe at varying hydrostatic pressures up to 8 GPa. The pressure response is anisotropic with a larger compressibility along c-axis. At ambient pressure, Fermi surface nesting between hole and electron pockets induces spin density wave (SDW) order at the vector (π , π , 0) with a collinear antiferromagnetic structure. With the increase of pressure, the Fermi surface nesting is reduced, and therefore the SDW is suppressed, which could not enhance superconductivity based on the spin-fluctuation scenario. For the phonon dispersion, the bands have blue-shift except for the modes around 100 cm −1 , indicating hardening of the vibration modes in a wide frequency range. Furthermore, the electron-phonon coupling constant and the corresponding T c by McMillan equation are calculated. However, there is no obvious enhancement of T c under pressure, which further rules out the conventional phonon-mediated superconductivity of FeSe. Maybe the local magnetic moment plays an important role for the superconductivity and enhancement of T c under pressure.

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A simple class of singular, two species Vlasov equilibria sustaining nonmonotonic potential distributions

Nocera

Palumbo

2013

Physics of Plasmas

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We present new elementary, exact weak singular solutions of the steady state, two species, electrostatic, one dimensional Vlasov-Poisson equations. The distribution of the hot, finite mass, mobile ions is assumed to be log singular at the position of the electric potential's minimum. We show that the electron energy distributions on opposite sides of this minimum are not equal. This leads to a jump discontinuity of the electron distribution across its separatrix. A simple relation exists between the difference of these two electron distributions and that of the ions. The velocity Fourier transform of the electron singular distribution is smooth and appears as a simple Neumann series. Elementary, finite amplitude profiles of the electric potential result from Poisson equation, which are smoothly, but nonmonotonically and asymmetrically distributed in space. Two such profiles are given explicitly as appropriate for a nonmonotonic double layer and for a plasma bounded by a surface. The distributions of both electrons and ions supporting such potential meet smooth and kinetically stable boundary conditions at one plasma boundary. For sufficiently small potential to electron temperature ratios, the nonthermal, discontinuous electron distribution resulting at the other plasma boundary is also stable against Landau damped perturbations of the electron distribution.

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Double-layer formation in the extended Franck-Hertz experiment

Cited by 3 publications

References 35 publications

Photoelectric Franck-Hertz experiment and its kinetic analysis by Monte Carlo simulation

Photoelectric Franck-Hertz experiment and its kinetic analysis by Monte Carlo simulation

The Effects of Pressure on the Structural, Electronic, and Lattice Dynamical Properties of FeSe Superconductor

A simple class of singular, two species Vlasov equilibria sustaining nonmonotonic potential distributions

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