如果碳纳米管阴极附近的真空度太低，将产生打火、气体电离、离子回轰阴极等问题，将导致阴极发射电流的迅速衰减。
If the vacuum near the cathode is too poor, it will generate spark, gas ionization and ion bombardment on cathode, which can result in a fast attenuation of the emission current.
提出了一种无需施加磁场、利用发射电流衰减速度测量真空开关灭弧室真空度的新方法。
A new method is presented for measurement of internal pressure of vacuum interrupters, having no use of magnetic fields but using decay velocity of emission current.
以X射线衍射（XRD）、透射电子显微镜（TEM）、发射光谱和衰减时间谱等手段表征材料性能。
The morphology, structure, and photoluminescence(PL) of the phosphors were investigated by transmission electron microscope(TEM), X-ray diffraction(XRD), emission spectra, and decay time.
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