H NMR spectra of hexamethylbenzene (HMB) in proionated crystalline and amorphous matrices at low temperatures are presented. All spectra reveal lineshape changes which can be attributed to methyl group tunnelling. Compared to neat HMB, a drastic increase of the tunnelling frequency is found for all
Emission studies of 9-cyanoanthracene excimers generated in glassy and crystalline matrices
✍ Scribed by S.E. Morsi; D. Carr; M. Ashraf El-Bayoumi
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- English
- Weight
- 342 KB
- Volume
- 58
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Fluorescente spectm of 9-cyanoanthracene polycrystallïne films and glasses of different viscosities and pokuities are reported. The 490 MI emitting species is identified as the 'crans excimer. The blue-shift of 9-CEIA crystal emission upon increasing temperature is explained in tenns of a temperatuependent competition between two crystal traps giving rise
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