用高分辨IR吸收spectroscopy精确测量~（36）ArH ~+和~（38）ArH ~+振转跃迁
New accurate measurement of 36ArH+ and 38ArH+ ro-vibrational transitions by high resolution IR absorption spectroscopy
摘要：
质子化的氩离子，$^{36}$ ArH $^{+}$，最近在蟹状星云（Barlow et al. 2013）的赫歇尔光谱中被发现。考虑到其$J$ =1-0和$J$ =2-1旋转跃迁频率（分别为617.5和1234.6 GHz）的大气不透明度，以及赫歇尔任务最近结束后目前缺乏适当的空间观测站，未来对该分子的研究将依赖于中红外观测。我们报告了在4.1-3.7 $μ$ m（2450-2715 cm $^{-1}$）范围内的$v$ =1-0带中的$^{36}$ ArH $^{+}$和$^{38}$ ArH $^{+}$旋转振动跃迁的精确波数测量。对于$^{36}$ ArH $^{+}$和$^{38}$ ArH $^{+}$，$v$ =1-0带的$R$（0）跃迁波数分别为2612.50135 $\pm$ 0.00033和2610.70177 $\pm$ 0.00042 cm $^{-1}$（$\pm3σ$）。对于在100 K温度和1 km.s线宽下热化的气体，计算的$^{-1}$（0）线的不透明度为$1.6\times10^{-15}\times N$（$^{36}$ ArH $^+$）。对于$^{36}$ ArH $^+$的柱密度大于$1\times 10^{13}$ cm $^{-2}$，预计$R$（0）线对明亮的中红外光源会产生显着吸收。
英文摘要：
The protonated Argon ion, $^{36}$ArH$^{+}$, has been identified recently in the Crab Nebula (Barlow et al. 2013) from Herschel spectra. Given the atmospheric opacity at the frequency of its $J$=1-0 and $J$=2-1 rotational transitions (617.5 and 1234.6 GHz, respectively), and the current lack of appropriate space observatories after the recent end of the Herschel mission, future studies on this molecule will rely on mid-infrared observations. We report on accurate wavenumber measurements of $^{36}$ArH$^{+}$ and $^{38}$ArH$^{+}$ rotation-vibration transitions in the $v$=1-0 band in the range 4.1-3.7 $μ$m (2450-2715 cm$^{-1}$). The wavenumbers of the $R$(0) transitions of the $v$=1-0 band are 2612.50135$\pm$0.00033 and 2610.70177$\pm$0.00042 cm$^{-1}$ ($\pm3σ$) for $^{36}$ArH$^{+}$ and $^{38}$ArH$^{+}$, respectively. The calculated opacity for a gas thermalized at a temperature of 100 K and a linewidth of 1 km.s$^{-1}$ of the $R$(0) line is $1.6\times10^{-15}\times N$($^{36}$ArH$^+$). For column densities of $^{36}$ArH$^+$ larger than $1\times 10^{13}$ cm$^{-2}$, significant absorption by the $R$(0) line can be expected against bright mid-IR sources.
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