Ratio of Transverse Diffusion Coefficient to Mobility of Electrons in High-Pressure Xenon

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We constructed a parallel plate drift chamber for measuring the ratio of the transverse diffusion coefficient $D_{\text{t}}$ to the mobility $\mu$ of electrons multiplied by the elementary charge $e$, $eD_{\text{t}}/\mu$, which is called the transverse characteristic energy, in high-pressure xenon gas. The characteristic energies of electrons in Xe were obtained at a high pressure of 1.0 MPa and the reduced electric field, $E/N$, from 0.77 to $7.7 \times 10^{-18}$ V$\cdot$cm2, where $E$ denotes an electric field and $N$ the number density of Xe atoms. At the same $E/N$, our results agreed well with the data at pressures from 107 to 193 kPa previously obtained by Koizumi et al. [J. Phys. B 19 (1986) 2331]. The characteristic energies of electrons in Xe were found to be constant as a function of $E/N$ from a low pressure to 1.0 MPa.
2004-08-15