| 释义 |
photoelectron Physics.|ˈfəʊtəʊɪlɛktrən|
Also with hyphen.
[f. photo- 1 + electron2.]
An electron released from an atom by the interaction of a photon with it; esp. one emitted from a solid surface by the action of light.
1912Phil. Trans. R. Soc. A. CCXII. 206 The law connecting the maximum emission velocity of the photo⁓electrons with the wave-length has been investigated by Ladenburg for Cu, Zu and Pt, and by Kunz for Na-K alloy and Cs. 1934[see Compton]. 1962H. D. Bush Atomic & Nucl. Physics ix. 209 An electron bound in an atom may absorb the whole of the energy of an incident γ-ray photon, being ejected from the atom as a photo⁓electron. Ibid. 210 The photoelectrons..will have a short range in the absorbing material, and so unless the material is very thin they are likely to be reabsorbed. 1965Wireless World Sept. 442/1 The process by which the energy of the particles is converted first into photons and then into photo-electrons at the cathode of a photo⁓multiplier tube is very inefficient. 1975J. R. Lamarsh Introd. Nuclear Engin. iii. 76 The kinetic energy of the ejected photoelectron is equal..to the energy of the photon less the binding energy of the electron to the atom.
Hence ˌphotoelecˈtronic a., of or pertaining to a photoelectron, or the interaction of light with electrons; ˌphotoelecˈtronics n. pl. (const. as sing.), the study of photoelectronic phenomena.
1922Physical Rev. XX. 195 (heading) Symmetry of emergent and incident photoelectronic velocities. 1940Chambers's Techn. Dict. 638/1 Photo-electronics. 1947Jrnl. Optical Soc. Amer. XXXVII. 430/1 The lower limit of usable voltage or gain in the photomultiplier tube in a pulse-counting application is reached when the photo⁓electronic output pulse becomes reduced..to the point where there is confusion from the tube noise and the thermal noise of the coupling resistor. 1957Proc. Inst. Electr. Engin. CIV. b. 480/1 The photo-electric effect is the fundamental basis of the generation of television signals, since this depends on the conversion of light energy into electrical energy. A detailed account of this branch of photo-electronics is beyond the scope of this review. 1963Adv. Photochem. I. 276 The second fundamental photo-electronic mechanism often producing photochromism is charge transfer (photoionization). 1966N. S. Kapany Fiber Optics (1967) viii. 206 One important application of fiber optics in photoelectronics lies in the coupling of image intensifier stages. 1970Sci. Jrnl. Aug. 90/1 Modern photoelectronic devices can detect or produce radiations over the whole electromagnetic spectrum. 1977Gramophone Apr. 1629/1 The auto-stop and pickup return at the end of a record is sensed by photo-electronic means, involving no side pressures. |