| 单词 |
azimuthal |
| 释义 |
azimuthal, a.|ˈæzɪˌmjuːθəl|
[f. prec. + -al1.]
1. Of or pertaining to the azimuth; used in taking azimuths.
1654S. Foster (title) Elliptical, or Azimuthal Horologiography. 1667Phil. Trans. II. 435 The Suns Azimuthal Distance from the Meridian. 1702Wallis ibid. XXIII. 1110 The Azimuthal Points of the Horizon. 1841Brewster Mart. Sc. iii. iv. (1856) 216 A brass azimuthal quadrant.
2. In azimuth, in a horizontal circle. azimuthal error (of a transit instrument): its deviation in azimuth from the plane of the meridian.
1863Cornh. Mag. VII. 383 For azimuthal error, that is for the amount that the transit deviates from the north and south line. 1876Chambers Astron. 668 By means of a screw a small azimuthal motion may be imparted. 1880Nature XXI. 211 The azimuthal rotation of the clouds.
▸ azimuthal quantum number n. Physics = orbital quantum number n. at orbital adj. and n. Special uses 2.
1920Proc. Royal Soc. (A.) 98 10 This requires ‘the *azimuthal quantum number [Ger. azimutale Quantenzahl] of an atom to jump at the utmost by a unit’. 1939J. W. T. Spinks tr. G. Herzberg Molecular Spectra & Molecular Struct. I. i. 15 The azimuthal quantum number l gives us therefore the orbital angular momentum of the electron in units h/2π. 1997Encycl. Brit. (Electronic ed.) The orbitals of an atom may be described by a principal quantum number, n, which may assume the values 1, 2, 3,..., and by an azimuthal quantum number, l, which may assume the values 0, 1, 2,..., n-1. |
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