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Coherence in electronically excited dimers. The observation of coherent dimers and its relationship to coherent excitons

✍ Scribed by A.H. Zewail; C.B. Harris

Publisher
Elsevier Science
Year
1974
Tongue
English
Weight
888 KB
Volume
28
Category
Article
ISSN
0009-2614

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✦ Synopsis

ThC cohcrcnt nature of molecular cxcikd dirners in th&r triplet states is unequivocally estabtishcd by a series of 10~' tempe&re~pti~y detected mapletic:csonnnce experimants in zero field. The results clearly establish that a . . :

minimum cohcrcnce ti_nc for the dimer $(+) siltc in 1,2,4,5tetrachlor~benzene (G 1.7 K) is ldnger than 5 'x 113~~ s while the exchange time in these systcrrsis spprosimately 16 X I@-I2 !;,'This implies that the coherence persists for atimc ~pproximatcly IO' times that essocijtcd with !k stochnxtic limit. The coherence time could, I~owcver, bc c+'ep lonzer: Moreover, these new results clearly dcmonstratc thal theIc is a direct &-II-! quantitative reL?tionship bc-~hve=n coherent properties of dimers and the coherent properties of triF!et Frcnlicl cxcitdns.

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