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长度的基本单位是米,定义为~(86)k_r原子在2P_(10)到5d_5能级之间电子跃迁时相对应的谱线在真空中波长的1650763.73倍。如电子受激后由一个能级降到另一个能级时,~(86)K_r灯发射出橙黄色的光。近来,由于氦-氖-碘稳频激光增大了射程和提高了光束的干涉能力,因此已经代替~(86)K_r灯作为光源成为过渡性的标准。一种被通称为干涉仪的仪器,用这种光产生干涉图以用来测量距离。在工程、科学和工业界中,可以很容易地从光波传递到实物标准
The basic unit of length is m, which is defined as 1650763.73 times the wavelength of vacuum in the spectrum of ~ (86) k_r atoms at the electronic transition between 2P_ (10) and 5d_5 levels. The ~ (86) K_r lamp emits an orange-yellow light when the electron is excited and falls from one level to another. Recently, the helium-neon-iodine frequency stabilized laser has become a transitional standard instead of the ~ (86) K_r lamp because of its increased range and increased beam interference. An instrument commonly known as an interferometer that uses this light to produce an interferogram to measure distance. In engineering, science and industry, light can be easily transmitted to physical standards