| 释义 |
‖ raie ultime Spectroscopy.|rɛ yltim|
[Fr. (A. de Gramont 1907, in Compt. Rend. CXLIV. 1101), f. raie line + ultime ultimate, last.]
An emission line in the spectrum of an element which is the last (or one of the last) to remain detectable as the concentration of that element is decreased.
1922W. F. Meggers et al. in Sci. Papers U.S. Bureau of Standards XVIII. 239 The raies ultimes are the most sensitive spectral lines of an element. 1923F. Twyman Wavelength Tables for Spectrum Anal. 79 It is in the ultra-violet that the ‘Raies Ultimes’ almost always lie. 1937C. Candler Atomic Spectra II. xvii. 120 As the proportion of calcium in the powder is diminished step by step, the weaker lines successively disappear until finally only one is left; this is known as the raie ultime. 1948G. R. Harrison et al. Pract. Spectroscopy xv. 429 The raie ultime is the last line of an element to disappear as the quantity of the element burned in a sample is decreased to the vanishing point. 1962Walker & Straw Spectroscopy I. i. 94 The identification of the persistent (the raies ultimes) lines proves without doubt the presence of the corresponding element. |