HIGH-RESOLUTION NEAR-INFRARED SPECTROSCOPY OF THE SECOND NEGATIVE SYSTEM OF O$^{+}_{2}$
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Ohio State UniversityAbstract:
The second negative system ($A^{2}\Pi_{u}-X^{2}\Pi_{g}$) of O$_{2}^{+}$ has been spectroscopically studied for over 70 years}, 685 (1991).} due to the significant role it plays in the chemistry of the upper atmosphere. More recently, the (2,18), (4,20), (6,20),}, 131 (2004).} (3,18), (3,19), and (4,19)}, 81 (2004).} bands were observed in the near infrared. While scanning for N$_{2}^{+}$ lines in a pure helium discharge containing N$_{2}$ as an impurity ($<$8 ppm) for another experiment,} we serendipitously found two new bands of O$^{+}_{2}$, (2,19) and (5,21). The O$^{+}_{2}$ ions were produced in a liquid-nitrogen-cooled positive-column plasma containing 1 Torr of He, where most likely the dominant source of oxygen in the plasma is a small leak in the vacuum system. The spectra were obtained with a Ti:sapphire laser (11,000-13,000 cm$^{-1}$) using velocity modulation, phase modulation with heterodyne detection, noise subtraction, and optical multi-passing. A detailed analysis of the newly observed bands will be presented.
Description:
{R. R. Laher and F. R. Gilmore, J. Phys. Chem. Ref. Data \textbf{20{L. Zheng et. al, J. Mol. Spectrosc. \textbf{229{L. Zheng et. al, J. Mol. Spectrosc. \textbf{226{See talk titled ``High-Resolution Near-Infrared Spectroscopy of He/N$_2$/H$_2$ Positive-Column Plasmas" by J. L. Gottfried, C. P. Morong, and T. Oka.
Author Institution: Department of Chemistry, Department of Astronomy $\&$ Astrophysics,; and the Enrico Fermi Institute, University of Chicago, Chicago,; IL 60637
Author Institution: Department of Chemistry, Department of Astronomy $\&$ Astrophysics,; and the Enrico Fermi Institute, University of Chicago, Chicago,; IL 60637
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