Interstellar chemistry recorded by nitrogen isotopes in Solar System organic matter

被引：33

作者：

Aléon, J

Robert, F

机构：

[1] CNRS, Ctr Rech Petrog & Geochim, F-54501 Vandoeuvre Les Nancy, France

[2] Museum Natl Hist Nat, UMS CNRS 2679, USM Museum 205, Lab Etude Mat Extraterreste, F-75005 Paris, France

来源：

ICARUS | 2004年 / 167卷 / 02期

关键词：

nitrogen isotopes; organic chemistry; solar nebula; molecular clouds;

D O I：

10.1016/j.icarus.2003.10.012

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The relationship between the organic N-15/N-14 and D/H ratios in small Solar System bodies (meteorites, interplanetary dust and comets) suggests that isotopic exchange reactions taking place at various temperatures are at the origin of the observed variations. These relationships are used to determine the exothermicity (DeltaE) of ion-molecule reactions that fractionated the nitrogen isotopic ratio in the presolar molecular cloud; that is DeltaE = 43 +/- 10 K. Comparison with current models of interstellar chemistry suggests that such a value could be achieved by condensation of N-15-rich gas-phase precursors onto grain surfaces and their further isolation from the gas by incorporation into large macromolecular structures. (C) 2003 Elsevier Inc. All rights reserved.

引用

页码：424 / 430

页数：7

共 57 条

[1] N-14-N-15 ISOTOPE FRACTIONATION IN THE REACTION N2H++N2 - INTER-STELLAR SIGNIFICANCE [J].