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Isotopic ratio of nitrogen on Titan: Photochemical. interpretation

机译:氮在泰坦上的同位素比:光化学。解释

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Nitrogen isotope fractionation in predissociation of N-2 (Liang et al., 2007) is combined with production of N(S-4), N(D-2), and N+ in dissociation and dissociative ionization by the solar EUV photons, photoelectrons, magnetospheric electrons and protons, and cosmic rays from the photochemical model. The calculated N-14/N-15 ratio in nitrites is 57, in excellent agreement with the observed ratio in HCN. Loss of nitrogen in condensation and polymerization of nitrites is 392 g cm(-2) Byr(-1) with nitrogen isotope fractionation factor of 2.8. Loss of nitrogen by sputtering is 57 g cm(-2) Byr(-1) (De La Haye et al., 2007) with fractionation factor of 0.73 (Mandt et al., 2014). If the current loss was constant throughout the age of the Solar System, then the initial 14N/15N ratio on Titan is 129, similar to 127 +/- 32 for ammonia in comets (Rousselot et al., 2014). However, the solar EUV and wind were stronger from the young Sun, and this tends to further reduce the initial N-14/N-15 ratio. Nevertheless uncertainties of the problem and of the ratio in comets support the idea that nitrogen on Titan appeared as ammonia ice with N-14/N-15 similar to that in comets.
机译:N-2预离解中的氮同位素分馏(Liang等,2007)与太阳EUV光子,光电子的离解和离解电离中的N(S-4),N(D-2)和N +的产生结合,磁层电子和质子以及来自光化学模型的宇宙射线。计算得出的亚硝酸盐中N-14 / N-15的比率为57,与在HCN中观察到的比率非常吻合。冷凝和亚硝酸盐聚合中损失的氮为392 g cm(-2)Byr(-1),氮同位素分馏系数为2.8。溅射损失的氮为57 g cm(-2)Byr(-1)(De La Haye等,2007),分馏系数为0.73(Mandt等,2014)。如果电流损耗在整个太阳系的寿命中保持恒定,则土卫六上的初始14N / 15N比为129,类似于彗星中的氨为127 +/- 32(Rousselot等人,2014)。但是,太阳EUV和风比年轻太阳要强,这往往会进一步降低初始的N-14 / N-15比率。然而,问题和彗星比例的不确定性支持了这样的观点,即土卫六上的氮以类似于冰彗星的N-14 / N-15形式出现为氨冰。

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  • 来源
    《Planetary and space science》 |2016年第12期|61-63|共3页
  • 作者

    Krasnopolsky Vladimir A.;

  • 作者单位

    Catholic Univ Amer, Dept Phys, Washington, DC 20064 USA|Moscow Inst Phys & Technol PhysTech, Moscow, Russia;

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