Excited state properties of C<sub>60</sub> revisited: a Raman study

Gordon Chambers; Siobhan Bridget Phelan; Garrett F. Farrell; Alan Brian Dalton; Hugh James Byrne

doi:10.1117/12.463668

27 August 2003 Excited state properties of C₆₀ revisited: a Raman study

Gordon Chambers, Siobhan Bridget Phelan, Garrett F. Farrell, Alan Brian Dalton, Hugh James Byrne

Proceedings Volume 4876, Opto-Ireland 2002: Optics and Photonics Technologies and Applications; (2003) https://doi.org/10.1117/12.463668
Event: OPTO Ireland, 2002, Galway, Ireland

Abstract

The excited state properties of C₆₀ thin films have been probed in the temperature range 77-273K using Raman spectroscopy. The change in the Raman pentagonal pinch mode of C₆₀ (whose position is largely independent of temperature) was monitored as a function of the excitation intensity at 514.5nm. This mode, normally positioned at 1469cm^-1, was seen to shift reversibly to a lower Raman frequency with increasing laser intensity. Two excited state species have been identified. The first, at 1466cm^-1 has been associated with the molecular triplet of C₆₀ as determined from measurements preformed in solution. The second species at 1463cm^-1, has been speculated to be an excited state co-operative involving two or more excited states in the solid and is seen to be intrinsic to solid state C₆₀ below the phase transition, as similar measurements in solution show no Raman evolution beyond 1466cm^-1. This species observed at 1463cm^-1 has previously been reported in the depolymerisation of solid state C₆₀, as well as in reversible processes in C₆₀ crystals and has been characterised by a nonlinear photo-luminescence and photoconductivity. It is further proposed in this study that this excited state is analogous to a number of highly conducting states recently reported for C₆₀. The data presented highlights the existence of a highly non-linear delocalised excited state species at low temperatures which is intrinsic to solid state C₆₀.

Citation Download Citation

Gordon Chambers, Siobhan Bridget Phelan, Garrett F. Farrell, Alan Brian Dalton, and Hugh James Byrne "Excited state properties of C₆₀ revisited: a Raman study", Proc. SPIE 4876, Opto-Ireland 2002: Optics and Photonics Technologies and Applications, (27 August 2003); https://doi.org/10.1117/12.463668

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