| 单词 |
excimer |
| 释义 |
excimer Chem.|ˈɛksɪmə(r)|
[f. excited ppl. a.+ dimer.]
1. An exciplex; spec. one formed from two identical atoms or molecules.
1960Stevens & Hutton in Nature 25 June 1046/2 These properties of the collisionally formed excited dimer which has virtually the lifetime of a triplet state and the multiplicity of a singlet state are those of an ideal sensitizer{ddd}We suggest the term ‘excimer’ be used to distinguish it from the short-lived dimer excited directly in solutions exhibiting an absorption spectrum dependent on concentration. 1962Ibid. 6 Oct. 34/2 The difference by a factor of 2 between the excimer components of the observed mixture spectrum Z and (A+B) is therefore attributed to ‘mixed excimers’ (AB)*. 1972DePuy & Chapman Molec. Reactions & Photochem. iv. 53 These dimers may be formed via an excimer..derived from the 3(π, π*) cyclohexenone and a molecule of ground state cyclohexenone. 1979Mataga & Ottolenghi in R. Foster Molecular Assoc. II. i. 2 Excimer formation has now been observed for a multitude of aromatic hydrocarbons and their derivatives in fluid solutions. Excimers are also known in crystals and in low-temperature rigid solvents.
2. Special Comb.: excimer laser, a laser in which an excimer is used as the excited state for stimulated emission.
1973S. E. Harris Investigation Laser Dynamics (NASA Rep. CR-136024), Studies of the sodium-xenon excimer laser. 1985Time 11 Mar. 21/2 Excimer lasers..produce beams of short wavelengths that could destroy a missile by focusing on it for only a second. 1986New Scientist 13 Nov. 44/1 The excimer laser..emits ultraviolet light that cuts and marks materials without damaging them with heat{ddd}They are gas lasers that emit light when a halogen atom and a rare gas atom combine temporarily. |
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