Negative Absorption Phenomenon in Weakly Ionized Mercury Plasma

概要

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Amplification of radio-frequency wave, which results from the negative absorption due to stimulated cyclotron radiation, is verified in weakly ionized mercury plasma. It does not occur continuously but does pulsively at certain phase of an lf oscillations present in the dc plasma, and its maximum power gain at the electron cyclotron frequency is estimated to be over 5 dB from experimental result. Time-analyzed probe measurement shows that the excess of electrons is found in the energy region where the elastic collision cross section of electron with neutral atoms increases sharply with increasing electron energy, which is a necessary condition of negative absorption shown in theoretical consideration. If the parameters of plasma generation are adjusted to suitable values, the large emission pulse is observed synchronizing with some phases of the lf oscillations, which are considered to be self-excited in the plasma. Various features of this phenomenon are compared with those of Xe, Kr and Ar plasmas.
社団法人日本物理学会の論文
1973-01-05