On the sodium D line emission in the terrestrial nightglow

On the sodium D line emission in the terrestrial nightglow
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陆地夜光中钠 D 线发射

DOI:
10.1016/j.jastp.2011.10.019
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发表时间:
2012
影响因子:
1.9
通讯作者:
Plane J
Plane J
中科院分区:
地球科学4区
文献类型:
--
作者:
Plane J

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钠原子的发射由589.0和589.6nm的双重谱线组成,是地球夜光的一个显著特征。在三个地点收集了D线(RD)相对强度测量的大型数据库:ALOMAR天文台,Andenes(挪威,北纬69°),Kuujjuarapik(加拿大,北纬55°)和Danum Valley(婆罗洲,北纬8°)。RD在1.5和2.0之间变化,平均值为1.67。这些结果可以用Na夜光的理论模型来解释,该模型涉及Na和O3之间的反应最初产生电子激发的NaO(A2),然后与O反应生成Na(2 PJ),其分支比为1/6,J=3/2至1/2的倾向为2.0,或者NaO(A)被O2猝灭为NaO(X2)。然后,所得NaO(X)与O反应生成Na(2 PJ),其分支比为1/6,J=3/2至1/2的倾向为1.5。这些分支比和自旋轨道倾向是从电子势能面的统计相关性推导出来的,电子势能面通过Na+O2−离子对中间体将反应物NaO(A)+O和NaO(X)+O与产物Na+O2连接起来。该统计模型与早期实验室研究结果的拟合(Slanger等人,2005),其中RD是作为[O]/[O2]比率的函数测量的,表明NaO(A)被O2猝灭的速率系数约为1×10− 11 cm 3 molecule − 1 s −1。该统计模型也与最近的Na-D线宽的高分辨率观测结果良好雅阁(Harrell等人,2010年)。大气模型,然后使用重力波驱动的扰动Na层可以解释所观察到的变化RD。
Emission from atomic Na, consisting of a doublet of lines at 589.0 and 589.6nm, is a prominent feature of the earth’s nightglow. A large data-base of measurements of the relative intensities of the D lines (RD) was gathered at three locations: the ALOMAR observatory, Andenes (Norway, 69°N), Kuujjuarapik (Canada, 55°N) and the Danum Valley (Borneo, 8°N). RDvaries between 1.5 and 2.0, with an average value of 1.67. These results were interpreted using a theoretical model of the Na nightglow which involves initial production of electronically excited NaO(A2Σ) from the reaction between Na and O3, followed either by reaction with O to generate Na(2PJ) with a branching ratio of 1/6 and a J=3/2 to 1/2 propensity of 2.0, or quenching of NaO(A) to NaO(X2Π) by O2. The resulting NaO(X) then reacts with O to generate Na(2PJ) with a branching ratio of 1/6 and a J=3/2 to 1/2 propensity of 1.5. These branching ratios and spin-orbit propensities are derived from statistical correlation of the electronic potential energy surfaces connecting the reactants NaO(A)+O and NaO(X)+O with the products Na+O2, through the Na+O2−ion-pair intermediate. A fit of this statistical model to the results of an earlier laboratory study (Slanger et al., 2005), where RDwas measured as a function of the ratio [O]/[O2], indicates that the rate coefficient for the quenching of NaO(A) by O2is around 1×10−11cm3molecule−1s−1. The statistical model is also in good accord with recent high resolution observations of the Na D line widths (Harrell et al., 2010). An atmospheric model is then used to show that gravity wave-driven perturbations to the Na layer can account for the observed variability of RD.
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影响因子: 64.8
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