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An Analysis of the $B^{3}\Pi _{2} - X^{3}\Delta _{2}$ (0, 0) Band System of the TiO Molecule in Laboratory and Sunspot Spectra
Solar Physics ( IF 2.8 ) Pub Date : 2020-11-30 , DOI: 10.1007/s11207-020-01737-6
P. Sriramachandran , D. Priyadharshini , N. Ashraf Shiddeeqaa , R. Shanmugavel

The $B^{3}\Pi _{2} - X^{3}\Delta _{2}$ (0, 0) band system of the titanium monoxide (TiO) molecule was excited in a DC copper arc with a constant deviation spectrometer. The resulting spectrum has been analyzed using image J software. Relative intensity measurements of the P- and R-branch molecular lines of the (0, 0) band with rotational quantum ( $J$ ) numbering have been obtained. The measured intensity of rotational molecular lines and the $J$ numbering were used to estimate the excitation rotational temperature of the source emitting the spectrum of TiO molecules. Also the presence of TiO spectral lines of the $B^{3}\Pi _{2} - X^{3}\Delta _{2}$ (0, 0) band in the wavenumber region of 14 500 to 16 000 cm−1 has been confirmed in the umbral spectrum, from the atlases recorded at the National Solar Observatory using the Fourier transform spectrometer (FTS) of the McMath-Pierce Solar Telescope on Kitt Peak. The combined laboratory and sunspot spectral line measurements have been used to obtain the improved molecular structure parameters for the electronic states $B^{3}\Pi _{2}$ and $X^{3}\Delta _{2}$ of the TiO molecule. Using equivalent width measurements of well resolved and identified lines in the sunspot spectrum with known rotational quantum number, the effective rotational temperature was found to be $2555 \pm 780$ K. This proves the presence of TiO molecules in sunspot and other higher temperature astrophysical sources.

中文翻译:

实验室和太阳黑子光谱中 TiO 分子的 $B^{3}\Pi _{2} - X^{3}\Delta _{2}$ (0, 0) 能带系统分析

一氧化钛 (TiO) 分子的 $B^{3}\Pi _{2} - X^{3}\Delta _{2}$ (0, 0) 能带系统在直流铜电弧中被激发恒定偏差光谱仪。使用图像 J 软件分析了所得光谱。已经获得了具有旋转量子 ($J$) 编号的 (0, 0) 带的 P 和 R 分支分子线的相对强度测量值。旋转分子线的测量强度和$J$编号用于估计发射TiO分子光谱的源的激发旋转温度。在 14 500 到 16 000 波数区也存在 $B^{3}\Pi _{2} - X^{3}\Delta _{2}$ (0, 0) 带的 TiO 谱线cm−1 已在本影光谱中得到证实,来自国家太阳天文台使用基特峰麦克马斯-皮尔斯太阳望远镜的傅里叶变换光谱仪 (FTS) 记录的地图集。结合实验室和太阳黑子光谱线测量已被用于获得电子态 $B^{3}\Pi_{2}$ 和 $X^{3}\Delta_{2}$ 的改进分子结构参数二氧化钛分子。使用具有已知旋转量子数的太阳黑子光谱中解析良好且已识别的谱线的等效宽度测量,发现有效旋转温度为 $2555 \pm 780 $ K。这证明了太阳黑子和其他更高温度的天体物理源中存在 TiO2 分子. 结合实验室和太阳黑子光谱线测量已被用于获得电子态 $B^{3}\Pi_{2}$ 和 $X^{3}\Delta_{2}$ 的改进分子结构参数二氧化钛分子。使用具有已知旋转量子数的太阳黑子光谱中解析良好且已识别的谱线的等效宽度测量,发现有效旋转温度为 $2555 \pm 780 $ K。这证明了太阳黑子和其他更高温度的天体物理源中存在 TiO2 分子. 结合实验室和太阳黑子光谱线测量已被用于获得电子态 $B^{3}\Pi_{2}$ 和 $X^{3}\Delta_{2}$ 的改进分子结构参数二氧化钛分子。使用具有已知旋转量子数的太阳黑子光谱中解析良好且已识别的谱线的等效宽度测量,发现有效旋转温度为 $2555 \pm 780 $ K。这证明了太阳黑子和其他更高温度的天体物理源中存在 TiO2 分子.
更新日期:2020-11-30
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