Isotopic Fractionation in Interstellar Chemistry

Charnley, Steven B

关键词: ISOTOPES;    FRACTIONATION;    INTERSTELLAR CHEMISTRY;    INTERSTELLAR MATTER;    MOLECULAR CLOUDS;    CARBON;    NITROGEN;    OXYGEN;    SOLAR NEBULA;    TELESCOPES;    ATACAMA DESERT;    CHILE;   

RP-ID  :  GSFC-E-DAA-TN60285

学科分类：空间科学

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

Anomalously fractionated isotopic material is found in many primitive Solar System objects, such as meteorites and comets. It is thought, in some cases, to trace interstellar matter that was incorporated into the Solar Nebula without undergoing significant processing. We will review observations and models of the nitrogen, oxygen, and carbon fractionation chemistry in dense molecular clouds. The range of fractionation ratios expected in different interstellar molecules will be discussed and compared to the ratios measured in molecular clouds, comets and meteoritic material.These studies make several predictions that can be tested by high-resolution molecular line observations with ALMA (Atacama Large Millimeter Array).