Abstract
Low-pressure discharges excited by a microwave (f = 2.45 GHz) supplemented with a static magnetic field are studied for possible use as new electrodeless Light sources. When the magnetic field strength is increased over the range of the electron cyclotron resonance (ECR), the light intensity emitted from the mercury lamp is more than 4.6 times that at B = 0 in high-power operation of the microwave. In the case of low-power operation of the microwave, the light intensity measured at the ECR point is increased to about three times that at B = 0, although the total maximum intensity of the emitted light is weaker than that in high-power case. The mechanism of the increment of light intensity in the high-power case is discussed with using the model of a helicon wave excitation.
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