Radiofrequency EDLs

Radiofrequency EDLs. The intensity of these lamps may be lower than that of microwave lamps, but they give better short and long term stability without the need for a thermostat. The radio frequency commonly employed is 27.12 MHz. Radiofrequency EDLs are available for about 15 elements, and they are particularly suitable for routine applications of the volatile elements arsenic, selenium, antimony, tellurium, and phosphorus. 

Microwave energy is widely used for excitation of EDL because it is usually more efficient than radiofrequency energy for generation of intense light. Microwave radiation for excitation of gas discharges is usually generated by use of a fixed-frequency (2.45 GHz) magnetron oscillator. 

The EDL are usually constructed of quartz or glass, depending on the spectral region desired, and are 3-5 cm long and about 1 cm in diameter. A metal or metal salt is placed in the lamp, along with an inert gas at low pressure. When the lamp is placed in a radiofrequency field, excitation of the metal occurs. 

Electrodeless discharge lamps EDLs employ either microwave energy (microwave-excited EDLs) or radiofrequency energy (radiofrequency-excited EDLs)... 

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