Fig. 1.
From: On the detections of C60 and derivatives in circumstellar environments
The comparison of the experimental wavelengths of the four IR bands of solid- and gas-phase C60. The solid black curves are the observed spectra of IRAS 01005+7910, NGC 7023, and Tc 1 (courtesy of Kris Sellgren, Jan Cami, and Jeronimo Bernard-Salas). Note that the 7.0, 8.5, and 17.4μm features are blended with AIBs in the spectra of NGC 7023 and IRAS 01005+7910.