关于循环荧光对弥散星际介质中小芳香分子的影响的研究
Concerns regarding recurrent fluorescence's impact on smaller diffuse ISM aromatics
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中文总结 AI 辅助
该研究探讨循环荧光对弥散ISM中小芳香分子的影响,指出其无法推翻相关模型,也无法支持这类分子作为弥散星际带载体的结论。
中文摘要 AI 辅助
近期研究表明,循环荧光(RF)可增强弥散星际介质(ISM)中小芳香分子抗碎片化的能力,但该假说受到持续的离解复合(电子)和持续离解光子的时标挑战。具体而言,中性氰基萘可承受13.6 eV的光电离,生成的阳离子的多余能量通过分子内振动再分配(IVR)传递,而RF提供辐射稳定途径(≈7 eV的可忽略存活极限)。然而,该阳离子每τ≈0.5⁺⁵.⁶₋₀.₄年发生一次离解复合,释放≈8.6 eV能量,超过了存活极限;此外,每τ≈16⁺²²³₋₁₄年还会发生7-13.6 eV的光破坏(总视觉消光A_V=0-1,当A_V≈0时τ≈4⁺⁷₋₂年)。近期对RF的实验室表征具有开创性,但该机制既无法推翻表明弥散ISM中小芳香分子(N_C≈7-11)存在缺口的模型,也无法支持这些分子作为可行弥散星际带载体的结论。
英文摘要
Recent research implied that recurrent fluorescence (RF) could bolster smaller aromatics against fragmentation in the diffuse ISM, yet that hypothesis is contested by timescales for unrelenting dissociative recombination (electrons), and unceasing dissociating photons. Specifically, neutral cyanonaphthalene can sustain $13.6$ eV photoionization, and the ensuing cation's excess energy is channeled through intramolecular vibrational redistribution (IVR), with RF providing the radiative stabilization pathway ($\simeq7$ eV negligible survival limit). However, that cation endures dissociative recombination every $τ\approx0.5^{+5.6}_{-0.4}$ years, which deposits $\simeq 8.6$ eV and exceeds the limit. Moreover, that is paired with $7-13.6$ eV photodestruction each $τ\approx16^{+223}_{-14}$ years (total visual dust extinction $A_V=0-1$, and $τ\approx4^{+7}_{-2}$ years for $A_V\approx0$). Recent laboratory characterizations of RF were seminal, but the mechanism may not overturn models indicating a gap in smaller $N_C\approx7-11$ diffuse ISM aromatics, nor support those molecules as viable diffuse interstellar band carriers.
发表机构
- Mount Saint Vincent University(圣文森特山大学)
- IXM-Secihti-Centro de Investigaciones Químicas, IICBA, Universidad Autónoma del Estado de Morelos(莫雷洛斯自治大学 IXM-Secihti-化学研究中心 IICBA)
- Saint Mary’s University(圣玛丽大学)
- Université Laval(拉瓦尔大学)
- Dalhousie University(达尔豪斯大学)
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