| 释义 |
spectroscopic, a.|spɛktrəˈskɒpɪk|
[f. prec. or ad. F. spectroscopique.]
1. Performed by means of the spectroscope.
1864Athenæum No. 1929. 500/2 The spectroscopic examinations. 1870Proctor Other Worlds ii. 38 So many of the wonders of modern science are associated with spectroscopic analysis. 1878Newcomb Pop. Astron. iii. ii. 257 Devoting special attention to the spectroscopic observations. 1883Science I. 115/1 The results of spectroscopic work.
2. a. Presented or afforded by, pertaining or belonging to, the spectroscope.
1869Eng. Mech. 31 Dec. 375/1 Data..with respect to the spectroscopic appearances of comets. 1879Proctor Pleas. Ways Sci. i. 7 In some cases, the quantity of a material to give unmistakable spectroscopic evidence is singularly small. 1884Knight Dict. Mech. Suppl. 835/2 Spectroscopic Eyepiece,..an adaptation of the spectroscope to the microscope for the examination of minute substances.
b. spectroscopic binary (Astr.), a star whose binary nature is revealed only by a study of its spectrum.
1896Circular Harvard Univ. Observatory No. 11, Professor Solon I. Bailey has found that the star µ1 Scorpii is a spectroscopic binary. 1930R. H. Baker Astron. viii. 338 Some examples of spectroscopic binaries among the bright stars are: Capella, Spica, Castor, β Aurigae and Algol. 1975Sci. Amer. Mar. 28/2 The normal star associated with Cygnus X-1 is a single-line spectroscopic binary with a period of 5·6 days. The term spectroscopic here means that the presence of two stars is indicated by a periodic Doppler shift of the spectral lines of at least one of the stars as they revolve around a common center of gravity. 1978Pasachoff & Kutner University Astron. vi. 134 (caption) Alcor and Mizar provide examples of both visual and spectroscopic binaries.
3. Occupied or dealing with spectroscopy.
1871tr. Schellen's Spectrum Anal. Pref. 4, I regret that the author has reversed the practice of the principal spectroscopic authors. 1871Daily News 12 Jan., It is true the spectroscopic party..at Oran failed totally.
So spectroˈscopical a.
1870Eng. Mech. 11 Feb. 520/2 The nature of the solar atmosphere is ascertained by spectroscopical examinations of the light of the sun. 1882Athenæum 4 Mar. 286/2 An interesting series of spectroscopical observations.
▸ Astron. Of the sky, atmospheric conditions, etc.: sufficiently clear of cloud or humidity to permit astronomical observation using a spectroscope.
Contrasted with photometric, which indicates a greater level of visibility.
1981Q. Jrnl. Royal Astron. Soc. 22 267 A spectroscopic hour was one when the darkness, humidity and wind speed conditions were as above [i.e. assessed as photometric] but the extinction or obscuration limits were exceeded. 1992Revista Mexicana de Astronomia e Astrofisica 24 179 From January 1984 to December 1991, 56.7% of the nights were of ‘photometric’ quality and 80.4% were of ‘spectroscopic’ quality. 2001Proc. 27th Internat. Cosmic Ray Conf. 2769/2 Mt. Saraswati in Hanle is an exceptionally fine astronomical site offering about 260 spectroscopic nights per year. |