Radiofrequency power density

Inductively coupled plasma Plasmas generated by application of radiofrequency power to a nonresonant inductive coil and maintained by an inductive electromagnetic field. Low-pressure ICP is a high-density plasma source. 

Factors that affect the rate of low-temperature ashing other than radiofrequency power and oxygen flow rate are the coal particle size and depth of sample bed. Typical conditions for ashing are a particle size of less than 80 mesh, a sample layer density of 30 mg/cm2, oxygen flow rate of 100 cm3/min, chamber pressure of about 2 torr, and a 50-W net radio-frequency power. The total time required is 36 to 72 hours, and specified conditions must be met during the procedure to obtain reproducible results. 

Figure 3. Effects of changing power density of a 147-MHz radiofrequency field, sinusoidally amplitude-modulated at 16 Hz, on 45Ca2 efflux from freshly isolated chick cerebral hemispheres. Ordinate shows mean difference (with S.E.) between exposed (Vr) and control (Vr) samples (25) ...

Equivalent Incident Power Densities at Different Frequencies. The average electric field intensity squared that is induced within a spherical sample of radius (a) much less than the wavelength ( ) of the radiofrequency field in air is... 

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