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Zeeman effect of the PMDR signal and the mechanism of the intersystem crossing process in pyrazine at 1.6 K

✍ Scribed by Paul E. Zinsli; M.A. El-Sayed

Publisher
Elsevier Science
Year
1975
Tongue
English
Weight
436 KB
Volume
36
Category
Article
ISSN
0009-2614

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✦ Synopsis

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 involve an intermediate triplet state with zero-field parameters sim-iIar to those of the lowest i~,'n* state of scbstitu?ed benzene. The reIative probability of the direct to the indirect crossing to the different spin levels is concluded. The limitations of the mclhod are discussed.

πŸ“œ SIMILAR VOLUMES

The mechanism of the S1 ⇝ Tx intersystem
The mechanism of the S1 ⇝ Tx intersystem crossing process in aromatic hydrocarbons from PMDR
✍ M.A. El-Sayed; W.R. Moomaw; J.B. Chodak πŸ“‚ Article πŸ“… 1973 πŸ› Elsevier Science 🌐 English βš– 563 KB

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