Absolute Determination of High Voltages Using Fast-Beam Laser Velocimetry
Absolute Determination of High Voltages Using Fast-Beam Laser Velocimetry
复制标题
使用快束激光测速法绝对测定高电压
DOI：
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发表时间：
1988
期刊：
影响因子：
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通讯作者：
E. Riis
中科院分区：
文献类型：
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作者：
O. Poulsen;E. Riis
电子伏特的定义为1 eV，即电荷为e的粒子通过穿越1 V的电势差而获得的能量，可用于通过快束激光测速仪绝对确定高压。用稳频连续染料激光器测量了重离子在未知高压电势下的加速速度。测得的多普勒频移直接产生离子的速度，从而确定它们的能量。能量又通过原子质量和原子质量常数muc 2/{e}与加速电压U相关，其中1/{e}表示从焦耳到电子伏的转换。基本质量通常已知在107的几分之一以内，原子质量常数也是如此。这对建议的高电压标准δU/U = 3 × 10-7施加了基本限制。
The definition of the electronvolt, 1 eV, as the energy a particle with charge e gains by traversing a potential difference of 1 V, can be used for absolute determination of high voltages by fast-beam laser velocimetry. The velocity of heavy ions, which are accelerated in an unknown high-voltage potential, is measured using a frequency-stabilized cw dye laser. The measured Doppler shift directly yields the velocity of the ions, thus determining their energy. The energy is, in turn, related to the accelerating voltage U by the atomic masses and the atomic mass constant muc2/{e}, where 1/{e} represents the conversion from joule to electronvolt. The fundamental masses are typically known to within a few parts in 107 as is the atomic mass constant. This imposes a fundamental limit on the proposed high-voltage standard of δU/U ≈ 3 × 10-7.