The 7 irradiation of an ethanol glass at 77Β°K produces solvated electrons (e,) which have an absorption spectrum with hax = 520 nm at 6Β°K. The conversion of esinto trapped electrons which absorb in the infrared (i.e., electrons in unrelaxed traps denoted by et) has been observed in bleaching es -at
Photoconductivity of presolvated electrons in ethanol glass at 4 K
β Scribed by Hirotomo Hase; Larry Kevan; Takenobu Higashimura
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- English
- Weight
- 284 KB
- Volume
- 55
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
Photoconductivity of localized electrons, which are not solvated, in r-irradiated ethanol glass at 4 K was studied. Photocurrents of lo-l3 A or larger were stably detected in the wavelength range of 900-2200 nm. The wavelength dependence of the photocurrent reveals that pre-solvated electrons probably have no bound excited state.
π SIMILAR VOLUMES
The absorption spectrum ore; in ethanol is composed of 'hrce bands, suggesting the existence of various kinds of traps. The reuapping phenomenon and the increase of the Bz radical were observed after photobleaching e; at 4"K, but not e;. The photc-transition of ei is a bound-free one, but that of e;
77 K acre invsstlgated by opt~nl absorption and ESR mcasuremcnts over B wldc range or conccntntions. Abrupt changes of yield and spectral parameters were obscrvcd between I Z and Ia mol% etkmol where a structural tinsICon of the mbture had been reported.
Anions of benaophenone, acetophenone, and 4-hydroxy-benzophenone were produced in ethanol at 4.2% bj steady.7 irradiation. Their absorption spectra are signiticantly different from those obtained in ethanol at 77"K, but change into the same spectra on raising the temperature. The spectra at 4.2"K ar