| 释义 |
photo-ionization Physics.|ˌfəʊtəʊaɪənaɪˈzeɪʃən|
Also without hyphen.
[f. photo- 1 + ionization2.]
Ionization produced by electromagnetic radiation.
1914S. E. Sheppard Photo-Chem. ix. 356 (heading) Photo-ionization of gases. 1955Jrnl. Brit. Interplanetary Soc. XIV. 18 From its effect in lowering the D layer, H. Friedman deduced that the intensity of the sun's radiation in the Lyman alpha wave-length must increase a thousand fold during solar flares. He added that it creates the D region by photo-ionization of nitrous oxide. 1975D. H. Burrin in Williams & Wilson Biologist's Guide to Princ. & Techniques Pract. Biochem. v. 166 Alternatively, strong electric fields..or ultraviolet light (photoionization) may be employed to ionize the sample.
So photoˈionize v. trans., to ionize by means of electromagnetic radiation; photoˈionized, -ˈionizing ppl. adjs.
1953Meek & Craggs Electr. Breakdown of Gases i. 15 Photoionizing radiations. 1962Jrnl. Optical Soc. Amer. LII. 1241/1 Different responses at short wavelengths result from the different thicknesses of the surface layer from which the photo-ionized carriers must diffuse before recombination. 1974Rev. Sci. Instruments XLV. 662/2 The approach consists of photoionizing some species in a field-free region and extracting a portion of the photo⁓electrons thus produced into a beam. 1977Jrnl. R. Soc. Arts CXXV. 767/1 A second laser beam was..used to photoionize the excited magnesium atoms. |