| 释义 |
photoemission Physics.|ˈfəʊtəʊɪmɪʃən|
Also with hyphen and † as two words.
[f. photo- 1 + emission.]
The emission of electrons from a surface by the action of light incident on it.
1916Physical Rev. VII. 383 (heading) Theories of photo emission. 1923Ibid. XXII. 578 It is evident..that the gases given off by the copper-oxide cylinder during the baking out of the tube and the glowing of the filament, have a pronounced effect upon the photo-emission. 1961G. R. Choppin Exper. Nucl. Chem. iii. 35 Tertiary electrons may be produced by photoemission resulting from the photons of the secondary ionization process. 1971Smith & Thomson Optics xxiii. 334 In another type of television camera tube, the vidicon, the basic effect is photoconduction instead of photoemission.
So ˈphotoemitted, -emitting ppl. adjs.; photoeˈmissive a., exhibiting, employing, or pertaining to photoemission; ˈphotoemitter, a photoemissive body or substance.
1932Electronics Jan. 19/2 The necessary condition arises to develop a photoemissive surface which..gives satisfactory emission. 1933Jrnl. Inst. Electr. Engin. LXXIII. 439/1 The equilibrium potential of the element is defined by (a) the velocity of the beam [of electrons] and (b) the secondary emission from the photo-emitting substance due to bombardment by the electrons. 1957Ibid. CIV. b. 467/1 Hertz discovered the photo-emissive effect—the loss of negative electric charges from metal surfaces which are illuminated. 1957Proc. Inst. Electr. Engin. CIV. b. 468/2 The earliest photo-emitters were common metal surfaces. 1959Control Feb. 92/2 The spectral response of photoemissive cells depends on the cathode coating. 1970Nature 3 Oct. 6/1 Two new spectroscopes using synchroton radiation and photoemitted electrons are singled out for special mention. 1971Smith & Thomson Optics xxiii. 333 Semiconductors are widely used as photoemitting surfaces. 1973[see photo-electric a. c]. 1975Physics Bull. Feb. 65/2 For the first time in a commercial instrument the simultaneous measurement of the energy and angular distribution of photoemitted or secondary electrons can be made. |
