Decrease in Intensity of Hg Lines near the Source in Weakly Ionized Mercury Gas Flow

概要

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In a flowing mercury afterglow with d. c. discharge source, rapid decrease in intensity of Hg lines near the source are investigated. Both the axial intensity distribution along the flow downstream and the radial one are interpreted in connection with diffusion of electron to the wall and electron attachment. The effective diffusion coefficient is found to be D_<β,γ>=2.7×10^3/p(cm^2/sec), which is close to the ambipolar diffusion coefficient under the experimental conditions i. e. n_6=5×10^8/cm^3 and T_e=2 eV. As for the resonance line (6^3P_1-6^1S_0), slow decrease in intensity as compared with decrease in intensity of lines emitted from the higher levels is taken to be due to the radiative imprisonment and in consequence the absorption coefficient of this line is obtained as 1.2×10^<-13>n_0/cm and the quenching cross section of the state 6^3P_1 due to the collisions with mercury atoms as <σ>_10=0.048 A^^°^2.
社団法人日本物理学会の論文
1971-02-05