マイクロ波パルス放電の形成過程
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概要
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The rate of increase of the electron density in a pulsed microwave field (5550 Mc/s) applied to gas mixtures of neon and argon at a fixed total pressure of 100 mmHg is calculated by taking account of various possible atomic processes and an energy distribution of electrons in the mixed gases.<BR>The electron density increases exponentially with a time constant τ<SUB>b</SUB> in the density range smaller than 10<SUP>11</SUP>/cm<SUP>3</SUP>. The relations between τ<SUB>b</SUB> and the relative partial pressure of argon, r, are obtained for various values of.E/p where. E/p is the ratio of the electric field strength to the total pressure of the mixed gas (in volt/cm mmHg). The value of r giving a minimum value of τ<SUB>b, min</SUB>=9×10<SUP>-7</SUP> sec is 0.01 for E/p=3, while it is 0.07 at τ<SUB>b, min</SUB>=3.8×10<SUP>-9</SUP> sec for E/p=17, A tendency is also obtained that the larger the value of E/p, the slower the inclination of τ<SUB>b</SUB> in the τ<SUB>b</SUB> r diagram for the range r<r<SUB>m</SUB> (which gives the minimum value of τ<SUB>b</SUB>). This is explained in terms of that, with increasing E/p, the direct ionizations by collisions between electrons and neutral neon or argon atoms predominate over the ionizations by collisions between metastabe neon atoms and the neutral argon atoms, the latter process corresponding to the so-called "Penning effect". A fairly good agreement is obtained between the calculated τ'<SUB>b</SUB>s and our experimental one's within a range of the experimental errors.