PARTI(l.ES

Complementary analysis techniques including electron micros­ copy (SEII/EDX and TEll), molecular spectroscopy (FTIIt and Raman), and secondary ion mass spectrometry (SIllS), are used to study individual dust particles collected in the stratosphere. Large deuterilJll enrich­ ments and solar flare tracks show that most particles in the "chondri­ tic" class are interplanetary dust particles (IDPs). Infrared tranllDis­ sion spectra of most IDPs fall into three major classes (layer-lattice silicates, pyroxenes and olivines). TEM and Raman measurements confirm this classification. The IR spectra show certain similarities to spec­ tra observed in comets and protostars. In particular the 6.8 J1ID features observed in protostars and IDPs may have a COllllon origin. Large D excesses are observed in IDPs of the first two lit classes. The correla tion of D/B ratios with the C concentration indicates a carbona­ ceous carrier of the excess D. The D enrichments and IR spectra provide links to interstellar m.olecular cloud material.