Spectra of trapped electrons in irradiated rigid media

J. Kroh; E. Romanowska

doi:10.1007/bf02516981

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 30: Issue 2

Spectra of trapped electrons in irradiated rigid media

Authors:

J. Kroh

J. Kroh Technical University Institute of Radiation Chemistry Lódz (Poland)

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E. Romanowska

E. Romanowska Technical University Institute of Radiation Chemistry Lódz (Poland)

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Pages:: 463–470

Online Publication Date:: 09 Jan 2007

Publication Date:: 01 Sep 1976

Article Category:: Research Article

DOI:: https://doi.org/10.1007/bf02516981

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Abstract

In the irradiated polar systems, the blue shifts of the absorption spectra of trapped electrons (e _t⁻ ) have as yet been observed by pulse radiolysis in the milisecond time range. This fact has been ascribed to the reorientation of the matrix polar molecules under the influence of the coulombic electron field. In order to check whether the spectral changes of e _t⁻ are limited to very short times only, the spectra of e _t⁻ in frozen 8M NaOH, 95% ethylene glycol (EG), 95% methanol, 95% ethanol, 95% n-propanol, 95% isopropanol, 95% butanol (+5% H₂O) were examined at the liquid nitrogen temperature by applying the stationary γ-radiolysis. Except for 8M NaOH and 95% EG, in the remaining matrices the shifts of e _t⁻ spectra towards the short wavelengths were observed within 24 hrs after irradiation. The less polar the matrix, the larger was the spectral shift. The observed effect seems to indicate that the reorientation process takes place in times much longer than these measured by pulse radiolysis. After the addition of scavengers the lowering of the initial absorption occured in all investigated systems. This was ascribed to the reaction of “dry” electrons with the scavengers. Moreover, the results obtained by the pulse radiolysis of ethanol indicate that the presence of scavengers accelerates the decay of the infrared part of the trapped electron spectrum. The “infrared electrons” (located in shallow traps) neither react with the scavenger nor deepen their traps by reorientation. Most probably in the presence of scavengers these electrons recombine with positive ions via tunneling.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)