The absorption efficiency of submicron amorphous carbon particles between 2.5 and 40 μm - Borghesi, A.; Bussoletti, E.; Colangeli, L.; Minafra, A.; Rubini, F. (Elsevier)
Submicronic amorphous carbon particles have been studied in the near-and middle-infrared at room temperature and their properties measured. Two different production methods have been used: (a) arc striking in an argon controlled atmosphere; (b) burning of hydrocarbons in air. TEM analysis allows determination of grain morphology and size distributions. Particle shapes appear to be influenced by different production methods, established by comparing our results with those of samples produced by means of focused laser pulses. Grain dimensions are strongly ambient pressure dependent since collisional growth is active in particle formation. All the absorption extinction curves indicate a general λ^-^1 fall-off, with small humps at 8, 11 and 12 μm. A band at about 13 μm is observed only for grains obtained by burning hydrocarbons. Possible temperature effects on the absorption wavelength dependence have been noted by comparing our observations with those of commercial lamp-black performed at liquid helium temperature.
http://linkinghub.elsevier.com/retrieve/pii/0020-0891(83)90017-9
Keywords: U