The observed change in the 10.38 GHz PhlDR signal of pyrazine in durene at 1.6 K upon the appliation of a magnetic fieid of O-500 G cannot be explained by the direct Sl(n, n\*) l---f T1 (n, rr\*) intersystem crossing process. The observed re- sults an be computer fitted if the crossing is assumed to
The mechanism of S1 [fx403-1] T1 nonradiative process in quinoxaline by Zeeman-PMDR spectroscopy
โ Scribed by Paul E. Zinsli; M.A. El-Sayed
- Publisher
- Elsevier Science
- Year
- 1975
- Tongue
- English
- Weight
- 470 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
It is demonstrated that the results of the Zeemzn effect on the observed phosphorescence spectrum at lo-3 temperatures can yield information concerning the mechanism of the St 4 Tl nonradiative process. The results of this s well a the ikeman-PMDR technique support the direct SI(n,r;*) 4 Tl(n,n*) intersystem crossing mechanism for quinoxa!ine in durene, in spite of the larger energy gap involved (as compared with the St 4 T2 3 TL mechanism).
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Using symmetry selection rules it is shown that the S r + TX intersystem crossing (ISC) process in (;:on-rotating) platrar condensed aromatic compounds with lowest states of the X,ZI \* type leads to triplet states with the two unpaired electrons spinning in the molecular plane. Out-of-plane distort
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