| 释义 |
anharmonic, a. Math.|ˌænhɑːˈmɒnɪk|
[ad. Fr. anharmonique, f. Gr. ἀν- not + ἁρµονικ-ός harmonic.]
Not harmonic. Applied to the section of a line by four points A, B, C, D, when their mutual distances are such that AB / CB is unequal to AD / CD ; the ratio between these two quotients is called the anharmonic ratio of AC.
1863Salmon Conic Sect. 57 This ratio is called the Anharmonic ratio of the pencil. 1865C. Price Tril. Coordinates 45 For a system of four points (or lines) there are but six different Anharmonic ratios. 1881Athenæum 13 Aug. 205/1 Anharmonic section.
Add: Hence anharmoˈnicity n. Physics, the state or quality of being anharmonic; the extent to which an oscillating physical system deviates from simple harmonic motion.
1936Ann. Rep. Progress Chem. XXXIII. 53 The values of the fundamental frequencies of the molecules have only been given to within 10cm.-1, since corrections have not been made for anharmonicity. 1940S. Glasstone Text-bk. Physical Chem. viii. 558 For most purposes the anharmonicity of the oscillations may be neglected. 1974Gill & Willis Pericyclic Reactions vi. 208 Substituents which introduce low-lying excited singlet states can dramatically enhance the rates of such reactions by increasing the anharmonicities of the potential energy curves. 1988Nature 29 Sept. 397/1 The peculiar value of a̲H has been ascribed to other causes—anharmonicity and ‘zero-point’ shifts of energy bands. |