パルスカウント法による電子移動速度の測定

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  • Measurement of Drift Velocity of Electrons using Pulse-Counting Method
  • パルス カウントホウ ニ ヨル デンシ イドウ ソクド ノ ソクテイ

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The electrons released from the cathode are controlled by the shutter pulse and they can move into the drift space while the shutter pulse is open. The electron swarm arrives at the collector after some drifting period. Electrons on the collector are introduced to a high-vacuum region through the orifice and detected with an electron detecting element as pulse signals. The detected electrons show some scattering on the arrival time. We get the arrival time spectra after a number of repetitions.<br>The drift velocity of electrons is obtained from the time interval between the time when the shutter is open and the time at which the arrival time spectrum shows the peak.<br>By this experimental apparatus using pulse-counting method, the drift velocities of electrons in N2 and the mixed gas for a carbon-dioxide gas laser was measured over the range 15 Td_??_+E/N_??_60Td Td and 5Td_??_E/N_??_80Td, respectively. The present data for N2 were in good agreement with those of J. J. Lowke [Aust. J. Phys., 16, 115(1963)], who used the ordinary time of flight method, over the E/N range. The result for CO2 laser gas was compared with the calculated one using a twoterm Boltzmann equation and published sets of cross-sections.

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