Triplet exciton spectral line shapes in molecular crystals: 1,2,4,5-tetrachlorobenzene

✍ Scribed by D.M. Burland; D.E. Cooper; M.D. Fayer; C.R. Gochanour

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 516 KB
• Volume: 52
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(77)80541-1

✦ Synopsis

Triplet exlton optical absorption line shapes, widths, and posltions have been mcn\urcd .IS 3 function of tcmpcr.rturc in the molccul.~r crystal 1 .2,~,5-tctr~chlorobcnlcne (ICU). At tcmpcraturcs ~bovc 20 K the .Ib\orption lme 1~s :I gaucs~:m shnpc .md incrcascs in width with tcmperaturc. At 14 K the hne IXCOI~~S lorcntzi,m. 1 III\ changu m IIIW sil,~pc with tcmpcraturc IS dlscusscd in terms of a model lirst suggsled by Tsyoznwa. The lorentzlnn line IS t.lken to be evidence of3 deloL,& tied cxciton \tatc. while the gaussian high temperature lint shape implies the locahzatlon of the chaton by lat ticc phonons.

The nnturc of the dlffercncc betwecn the optical line width md the prcvlou\ly reported TCII I Sli lmc width is also bncfly discussed.