DETECTION OF THE MAGNETIC DIPOLE-ALLOWED ORIGIN BAND OF THE $\widetilde{A}$$\leftarrow$$\widetilde{X}$ TRANSITION OF THE NITRATE RADICAL NO$_3$

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Despite its simplicity and atmospheric significance, the lowest electronic states of NO$_3$ remain poorly understood. The $\widetilde{A}$$^2$E$^{\prime \prime}$ state is Jahn-Teller (JT) active and is pseudo-JT coupled to the ground $\widetilde{X}$$^2$A$_2$$^{\prime}$ and excited $\widetilde{B}$$^2$E$^{\prime \prime}$ states. While the band origin 0$^{0}_{0}$ of the $\widetilde{A}$$\leftarrow$$\widetilde{X}$ transition is purely electric forbidden, the cavity ringdown spectrum of the vibronically-allowed $\widetilde{A}$$\leftarrow$$\widetilde{X}$ bands has shown rotationally-resolvable structures. We have detected the magnetic dipole-allowed origin ($\sim$7060 cm$^{-1}$) via CRD spectroscopy. Analysis of the band contour along with its implications of the JT/Pseudo-JT couplings in the dark $\widetilde{A}$ state of NO$_3$ will be discussed.

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Author Institution: Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125; Department of Chemistry, University of Texas at Austin, Austin, TX 78712

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