The triplet spin sublevel origins of the bands in the phosphorescke of pyrazine in a paradioxane host are assigned using phosphorescence-microwave double resonance techniques. The assignments cannot be interpreted in terms of a Dzh structure for the molecule in the triplet state, and indicate a trip
PMDR spectroscopy and the geometry of the triplet state
โ Scribed by M.A. El-Sayed; M. Leung; C.T. Lin
- Book ID
- 103011924
- Publisher
- Elsevier Science
- Year
- 1972
- Tongue
- English
- Weight
- 597 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
It is shown that phosphorescent m~cro~vave double resonance (PRfDR) an detect deviations from Czv, R,h or Dz symmetry. This is carried out by examining the radiative properties of the zero field level which should be*"dsrk" for molecules with these symmetries. The results show that in rz-hesone solvent at 1.6"K, 1,4-, but not 2,3_dibrotnonaphthal~~e, retains its Cz,, symme:p in its triplet state.
๐ SIMILAR VOLUMES
PMDR studies on a series of hdobenzenes have shown that the in-plane electron spin distribution is highly perturbable and that spin-orbit contributions to the rektive energies of the spin states become significant in the heavier halobenzene:. A distortion in the triplet state of the heavier dihalobe
Phosphorescence-microwave double resonance (PMDR) techniques are wed and the zero-field (zf) origin of the 0,O band of the phosphorescence of benzene-& in benzene-& a.t 1.6% is determined to be the TY level. This is cuns;tent with a 3B1u assignment for a distorted D2h benzene in its triplet state an