Detalles de publicación
PP 011010
Infrared spectroscopy and integrated molar absorptivity of C60 and C70 fullerenes at extreme temperatures
Instituto de Astrofísica de Canarias, Via Lactea s/n, E-38200, La Laguna, Tenerife, Spain
2Istituto Nazionale di Astrofisica - Osservatorio Astrofisico di Catania, Via S. Sofia 78, 95123 Catania, Italy
3Actinium Chemical Research, Via Casilina 1626/A, 00133 Rome, Italy
4Consejo Superior de Investigaciones Científicas, Spain
5Departamento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain
ABSTRACT
The detection of C60 and C70 fullerenes in young planetary nebulae and in reflection nebulae suggests that these molecules are more common in certain astrophysical environments than previously thought. The dependence on temperature of the positions and widths of the infrared bands of the C60 and C70 fullerenes is needed for a firm qualitative detection of these molecules in space. Furthermore, the integrated molar absorptivity (in km mol−1) of each infrared absorption band is required for a quantitative determination of the abundance of C60 and C70 in space. In this paper, we report on the temperature dependence of the wavelength shift and integrated molar absorptivity of the infrared bands of the C60 and C70 fullerenes. The measurements have been made in a KBr matrix in the temperature range between −180◦C and +250◦C. The experimental data have been extrapolated to derive both the infrared band shift and the integrated molar absorptivity of the C60 and C70 fullerenes at absolute zero temperature.
The detection of C60 and C70 fullerenes in young planetary nebulae and in reflection nebulae suggests that these molecules are more common in certain astrophysical environments than previously thought. The dependence on temperature of the positions and widths of the infrared bands of the C60 and C70 fullerenes is needed for a firm qualitative detection of these molecules in space. Furthermore, the integrated molar absorptivity (in km mol−1) of each infrared absorption band is required for a quantitative determination of the abundance of C60 and C70 in space. In this paper, we report on the temperature dependence of the wavelength shift and integrated molar absorptivity of the infrared bands of the C60 and C70 fullerenes. The measurements have been made in a KBr matrix in the temperature range between −180◦C and +250◦C. The experimental data have been extrapolated to derive both the infrared band shift and the integrated molar absorptivity of the C60 and C70 fullerenes at absolute zero temperature.