Phase resolved two-dimensional emission pattern of a low-frequency helium discharge

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作者：
Wright Lab, Wright-Patterson AFB, United States [1 ]
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来源：
IEEE Trans Plasma Sci | / 1卷 / 115-116期
关键词：
Bandpass filters - Charge coupled devices - Electric currents - Electric excitation - Electric waveforms - Electrodes - Helium - Impedance matching (electric) - Light emission - Photocathodes - Plasmas;
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摘要：
Time resolved two-dimensional (2-D) plasma-induced emission patterns of the 33D to 23P transition in a three-torr low-frequency helium discharge have been measured. The emission patterns are found to be asymmetric for complementary phases of the current at 30-KHz excitation frequency, however, they are symmetric for 200-KHz excitation frequency. The excitation of the 30-KHz discharge is similar to that of a dc discharge with increasing and decreasing current.
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