High Frequency Discharges

The insulating properties are excellent. At ordinary temperatures the resistivity of the translucent form is 10 Qm, and it is capable of withstanding high-frequency discharges at high voltages. See also Table 18.4 for data on other physical properties. 

Like diamond, DLC can be obtained by CVD by plasma action in a hydrocarbon atmosphere. Its deposition process differs from that of diamond in as much as the activation is not so much chemical (i.e., the use of hydrogen atoms) but physical. This physical activation is usually obtained by colliding accelerated ions produced by a high-frequency discharge. 

Figure 9. UV emission spectra of various molecules in the high-frequency discharge (2). I( ) = intensity, measured on radiation receiver, K = wavelength. (-----------------) OH(H.O) ( ) O, (— — j N, tenfold reduced...

Serum CK is consistently increased in all forms of AMD. Forearm ischemic exercise causes a normal rise of venous lactate concentration in patients with childhood or adult AMD. The electrocardiogram (ECG) is altered in Pompe s disease, with a short P-R interval, giant QRS complexes and left ventricular or biventricular hypertrophy, but is usually normal in the later-onset forms. The EMG shows myopathic features and fibrillation potentials, bizarre high-frequency discharges and myotonic discharges. 

Some drags block sodium channels, while others act on the GABA system. They enhance the GABA-dependent CNS inhibition. They also change the innacellular ratio of calcium and potassium ion concentrations, and block the A-methyl-o-aspartate (NMDA) receptor responsible for high-frequency discharges that appear during epilepsy. 

Table 1. Energy content of various subsystems of the low pressure plasma. Example Nitrogen high frequency discharge, 27 MHz, p. D. = 1 Torr cm, I/D = 1 A cm-, degree of dissociation a 0.6, Tt = 873°K...

This obiously does not exclude the possibility of oscillation phenomena such as ionization waves, etc., which are among the most frequently observed instabilities in d.c. glow discharges49. Any allowance for these phenomena in the theoretical treatment of chemical processes would introduce major complications and, we shall therefore ignore them in the first approximation. Such a simplification is justified, because the relaxation processes related to the ionization waves are usually much faster than chemical processes. Therefore, the oscillations take place on a time scale which is different from that of the chemistry. Moreover, the waves arise in a d.c. discharge rather than in a high frequency discharge, which was used in most experiments on chemical transport. 

With respect to the re-deposition of a coating on the first wall, the obvious advantage is the compatibility with Tokamak operation since it requires a minimum of auxiliary equipment and modification, particularly if a continuous, high frequency discharge is used. The power requirements for such an approach appear to be acceptable134. An rf heating system, if incorporated into the reactor design (e. g. 

Carbon selenide telluride is a thermally very unstable compound that cannot be sublimed in a high vacuum. The compound was claimed to have been obtained in 8% yield from carbon monoselenide, generated from carbon diselenide in a high frequency discharge, and gaseous tellurium. The infrared spectrum of carbon selenide telluride was recorded. No details about the reaction conditions were reported1. 

How does the magnetron electrode used in a high-frequency discharge behave... 

Yuasa S, Ishigami M. High frequency discharge experiment. I formation of organic compounds from methane and ammonia. Orig. Life. 1975 6 75-81. 

These conditions are fullfilled by discharges under reduced pressure, such as hollow cathode discharges and for some elements by high-frequency discharges. 

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