The relationship between microwave spectroscopy, coherent triplet excitons, and density of states functions in molecular crystals

✍ Scribed by A.H. Francis; C.B. Harris

• Publisher: Elsevier Science
• Year: 1971
• Tongue: English
• Weight: 575 KB
• Volume: 9
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(71)85025-x

✦ Synopsis

A theory of microwave band-to-band transitions in triplet Frenkei excitons in the coherent migration limit for a one-dimensional exciton associated with translationally equivalent molecules is developed. Because of selective spin-orbit coupling to the maw_ tic sublevels, an anisotropy in the zero fieId splitting across the band (k = 0 to k = *n/a) occutis which, on a reduced energy scale, "mirrorsW the energy dispersion of triplet exciton states. As a result, if the coherence time of a k state of the triplet band is longer than the intrinsic time associated with a microwave field connecting the magnetic sublevels of the band, one can measure both the bandwidth and density of states function with a zero field electron spin resonance experiment.