Open AccessInfrared spectroscopy and integrated molar absorptivity of C 60 and C 70 fullerenes at extreme temperatures
Author(s) -
IglesiasGroth Susana,
Cataldo Franco,
Manchado Arturo
Publication year - 2011
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2011.18124.x
Subject(s) - molar absorptivity , fullerene , infrared , infrared spectroscopy , absorption (acoustics) , physics , analytical chemistry (journal) , spectroscopy , molecule , materials science , optics , chemistry , astronomy , organic chemistry , quantum mechanics
The detection of C 60 and C 70 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 C 60 and C 70 fullerenes is needed for a firm qualitative detection of these molecules in space. Furthermore, the integrated molar absorptivity Ψ (in km mol −1 ) of each infrared absorption band is required for a quantitative determination of the abundance of C 60 and C 70 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 C 60 and C 70 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 C 60 and C 70 fullerenes at absolute zero temperature.