RAMAN SPECTRA OF SEVEN INTERPLANETARY DUST PARTICLES

The Raman Shift Spectra of seven interplanetary dust particles,U2034 (F10),U2034(F8),U2022(B1),W7074 18,W7074 C15,W7074 C3 and W7074 A7,were measured with a Spex-1403 Raman Spectrograph.The exciting radiations were the 488 nm and 514 nm line of a 5W argon ion laser.All seven spectra exhibit the 1350 and 1600 Acm^-1 arbon bands,implying that the IDPS were coated with hydrocarbon and incompletely crystallized carbon,the part of which may be the residue of hydro-carbon contents in the particles after water loss by the heating during their entry into the earth’s atmosphere.A weak band structure in the 520-610 cm^-1 range could be caused by cyclosilicates,and a weak band at 2900 cm^-1 is tentatively identified as due to hydrocarbon molicules.