Shoulder of Optical Absorption Spectrum of the Trapped Electron in Gamma‐Irradiated Crystalline Ice

1972 ◽  
Vol 57 (7) ◽  
pp. 2855-2856 ◽  
Author(s):  
Keisuke Kawabata ◽  
Shigeru Okabe ◽  
Setsuo Taniguchi
Keyword(s):  
Absorption Spectrum ◽  
Optical Absorption ◽  
Optical Absorption Spectrum ◽  
Gamma Irradiated ◽  
Trapped Electron

An investigation of the effects of X-rays on undoped and on hydrogen doped alkaline earth fluorides

1969 ◽  
Vol 309 (1496) ◽  
pp. 69-90 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Optical Absorption ◽  
Optical Absorption Spectrum ◽  
Alkaline Earth ◽  
Room Temperature ◽  
X Rays ◽  
Hydrogen Atoms ◽  
X Irradiation ◽  
Trapped Electron ◽  
Extract Information

We have investigated, using e.p.r. methods, the effects of X-rays on undoped and hydrogendoped alkaline earth fluorides. We find that irradiation of undoped CaF 2 at any temperature does not produce F centres in observable concentration. Irradiation of undoped SrF 2 and BaF 2 at 77 °K produces V k centres and trapped electron centres which anneal out below room temperature. The undoped SrF 2 and BaF 2 crystals are extremely difficult to colour with room temperature X-irradiation due, apparently, to recombination of electrons and holes. Irradiation of SrF 2 :H and BaF 2 :H crystals at 77 °K produces hydrogen atoms in fluorine sites (Hg centres) and trapped electron centres. The rate of introduction of the electron centres into the crystals is greater by a factor of about 3 than in the undoped crystals. Irradiation of CaF 2 :H at 77 °K also produces Hg centres and trapped electron centres but the rate of generation of the electron centres in these crystals is greater than in undoped CaF 2 by a factor of at least 25. The origin of this difference in the behaviour of CaF 2 :H and the behaviour of SrF 2 :H and BaF 2 :H and the nature of the response of alkaline earth fluorides to X-rays are discussed. The use of polarized bleaching light to extract information from the optical absorption spectrum of irradiated CaF 2 :H is described in an appendix.

Article

1998 ◽  
Vol 76 (4) ◽  
pp. 411-413
Author(s):  
Yixing Zhao ◽  
Gordon R Freeman
Keyword(s):  
Absorption Spectrum ◽  
Optical Absorption ◽  
Temperature Dependence ◽  
Optical Absorption Spectrum ◽  
Infrared Light ◽  
Solvated Electron ◽  
Solvated Electrons ◽  
Tert Butanol ◽  
Solvent Dependence ◽  
Increasing Temperature

The energy and asymmetry of the optical absorption spectrum of solvated electrons, es- , change in a nonlinear fashion on changing the solvent through the series HOH, CH3OH, CH3CH3OH, (CH3)2CHOH, (CH3)3COH. The ultimate, quantum-statistical mechanical, interpretation of solvated electron spectra is needed to describe the solvent dependence. The previously reported optical spectrum of es- in tert-butanol was somewhat inaccurate, due to a small amount of water in the alcohol and to limitations of the infrared light detector. The present note records the remeasured spectrum and its temperature dependence. The value of the energy at the absorption maximum (EAmax) is 155 zJ (0.97 eV) at 299 K and 112 zJ (0.70 eV) at 338 K; the corresponding values of G epsilon max (10-22 m2 aJ-1) are 1.06 and 0.74. These unusually large changes are attributed to the abnormally rapid decrease of dielectric permittivity of tert-butanol with increasing temperature. The band asymmetry at 299 K is Wb/Wr = 1.8.Key words: optical absorption spectrum, solvated electron, solvent effects, tert-butanol, temperature dependence.

scholarly journals Monitoring mechanical motion of carbon nanotube based nanomotor by optical absorption spectrum

2016 ◽  
Vol 109 (26) ◽  
pp. 263104 ◽  
Author(s):  
Baomin Wang ◽  
Xuewei Cao ◽  
Zhan Wang ◽  
Yong Wang ◽  
Kaihui Liu
Keyword(s):  
Absorption Spectrum ◽  
Carbon Nanotube ◽  
Optical Absorption ◽  
Optical Absorption Spectrum ◽  
Mechanical Motion
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