Gap Electric Field Research Articles

High frequency response and plasmon spectrum in Peierls dielectrics

Linear response of a quasi-one-dimensional conductor in Peierls state to a high frequency (ω α 2Δ, 2Δ is the Peierls gap) electric field directed at an arbitrary angle θ to the chain direction is calculated. Plasmon frequency decreases with θ increasing, the large damping of plasmons appearing when their frequency approaches 2Δ.

Statistical time lag of gas discharge in electrostatic recording

AbstractElectrostatic recording is applied widely to facsimiles and printers because of its high speed and high resolution. the time lag in gas discharge formation causes dots to be missed, which must be improved for high‐speed, high resolution recording. We tested the latent image formation by using an aluminum drum coated with a dielectric film uniformly charged to positive potential and a pin electrode. the effects of the pin electrode material, the recording pulse repetition period, and the recording voltage on the statistical time lag on initiating discharges have been investigated. the following results were obtained: (1) A phosphor bronze electrode causes the smallest time lag, followed by nickel and tungsten. (2) the logarithm of the mean statistical time lag is proportional to that of the repetition period. (3) the logarithm of the mean statistical time lag is inversely proportional to the air gap electric field. (4) When the recording pulsewidth is larger than 15 μs for a gap field of 55 MV/m and a recording pulse period of 10 s, the dots missing probability becomes less than 1%.

On the Theory of Resonance Raman Scattering in Disordered Semiconductors

AbstractUsing the Green's function technique a general expression of the one‐phonon resonance Raman scattering cross‐section is derived. This expression may be used to calculate the influence of a slowly varying random field present in the electronic subsystem on the resonance dependence. The theory is applied to the case of a fluctuating gap and internal random electric field. Local scattering amplitudes are obtained and the configurational average of the product of the scattering amplitudes is investigated. It is shown that this two point average effectively reduces to the averaging of the scattering amplitudes with one point distribution functions.

Investigation of a Laser Triggered Spark Gap

The influence of parameters affecting the laser triggering of a high voltage electrical sphere-sphere gap has been experimentally investigated. Of primary interest was the delay time between arrival of the laser pulse and current flow across the gap. This delay was studied as a function of total laser beam power (0–80 MW); dielectric gas (SF6, N2, air); gas pressure (100–1400 Torr); electrode spacing (0.4–1.5 cm); gap electric field (10–100 kV/cm); and focus point location between two 5 cm diam stainless steel spheres. Delay times less than 10 nsec were observed in SF6 at atmospheric pressure with corresponding low jitter. For the cases studied delay times varied inversely with the electric field, gas pressure, and focus point distance from the anode surface. Above a certain laser beam power the delay time was not a significant function of laser power for the range studied. Applications of laser triggering are discussed with a description of current and future research areas.