| 单词 | siegbahn |
| 释义 | siegbahn [`sēg´bän] SPECTROSCOPY A unit of length, formerly used to express wavelengths of x-rays, equal to 1/3029.45 of the spacing of the (200) planes of calcite at 18°C, or to (1.00202 ± 0.00003) × 10-13 meter. Also known as x-ray unit; X-unit. Symbolized X; XU. |
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