کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5487436 | 1523500 | 2017 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Radiative lifetimes for 29N2+ and implications for planetary escape and isotope enrichment
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
The Viking missions to Mars found that 15N/14N is enhanced by a factor of 1.62 compared to Earth and it was suggested that the cause was dissociative recombination (DR) of N2+. The high kinetic energy imparted to N in DR drives atmospheric escape. More recent models of the Martian ionosphere show that much of the N2+ is vibrationally excited. If DR of vibrationally excited 29N2+ is important, the energetics are such that the isotope enhancement would be greatly reduced. Here I show that at the Mars exobase electron temperature and density, the excited vibrational levels of 29N2+ radiate before they can recombine. The isotope enhancement arising from DR is due entirely to DR of 28N2+ with a small contribution to 14N escape arising from DR of the ground vibrational level of 29N2+.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 291, 15 July 2017, Pages 51-54
Journal: Icarus - Volume 291, 15 July 2017, Pages 51-54
نویسندگان
Steven L. Guberman,