| 释义 |
specˈtrometer
[ad. G. spektrometer or F. spectromètre.]
An instrument used for measuring the index of refraction. Now in extended use, any of a wide range of instruments for producing spectra and measuring the positions, etc., of spectral features. Cf. mass spectrometer s.v. mass n.2 10 d.
1874tr. Lommel's Light 144 The determination of the index of refraction can be much more conveniently effected by means of Meyerstein's Spectrometer. 1878Smithsonian Rep. 431 The spectrometer stands upon a plate of metal which can be made to revolve so that measurements by repetitions are practicable. 1883Knowledge 18 May 297/1 Professor Clifton of Oxford has brought out a new spectrometer. 1901Sci. Abstr. IV. 930 Universal spectrometer... This instrument can be used for studying any portion of the spectrum, either visually, photographically, or photometrically, with two different dispersions. 1950Sci. News XV. 19 Monochromatic light of chosen wavelength, from a spectrometer, is now used in order to stimulate the retinal receptors. 1958Antiquity XXXII. 124 The characteristics of the trace-elements present are detected by a special Gamma-ray Spectrometer. 1978P. W. Atkins Physical Chem. xix. 616 The centre of the e.s.r. spectrum of the methyl radical occurs at 329·4 mT when the spectrometer is using 9·233 GHz microwaves.
Hence spectroˈmetric a.; spectroˈmetrically adv.; specˈtrometrist, an expert in spectrometry; a person employed to operate a spectrometer; specˈtrometry.
Cf. F. spectrométrique, -métrie (Littré).
1891Cent. Dict., Spectrometric. 1902Webster Suppl., Spectrometry. 1903A. M. Clerke Probl. Astrophys. 8 The ‘spectrometric’ division of photometry consists in the comparative estimation of ray-intensities. 1948Physical Rev. LXXIV. 1222/1 By extending the method..a higher order mass resolution is obtained which is generally usable in the mass spectrometry of positive ions. 1953G. P. Barnard Mod. Mass Spectrometry 286 A different method was used..to determine the half-life of 85Kr mass spectrometrically. 1954Powell & Ross in Appl. Mass Spectrometry (Inst. Petroleum) 7 In Raman spectrometry, the material is irradiated with monochromatic light..and the light scattered at right angles to the incident beam is examined spectrometrically. 1958Antiquity XXXII. 124 The staff consists now of two Senior Scientific Officers, two Research Assistants, three technicians, a secretary and two part-time workers (optical spectrometrist and statistician). Ibid., In Optical Spectrometry, a programme of analysis of prehistoric European bronzes..is being carried out. 1962Oxf. Univ. Gaz. 9 Mar. 775/2 Continuing his research on the history of British Bronze Age metallurgy, he completed a programme of spectrometric analyses of Early Bronze Age material. 1971Nature 27 Aug. 646/2 Some 3,3-diaryl oxetanes which could not be isolated but only detected spectrometrically in solution. 1973Physics Bull. Feb. 108/1 The term chemi-ionization has unfortunately taken on a different meaning amongst mass spectrometrists. 1975McGraw-Hill Yearbk. Sci. & Technol. 193/1 Flame spectrometry, traditionally a single-element technique, has been advanced recently to include multielement analysis. |