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 Title: PROGRESS TOWARDS A HIGH-PRECISION INFRARED SPECTROSCOPIC SURVEY OF THE H3+ ION Author(s): Perry, Adam J. Contributor(s): McCall, Benjamin J.; Jenkins, Paul A., II; Kocheril, G. Stephen; Markus, Charles; Hodges, James N. Subject(s): Mini-symposium: High-Precision Spectroscopy Abstract: The trihydrogen cation, chem{H_3^+}, represents one of the most important and fundamental molecular systems. Having only two electrons and three nuclei, chem{H_3^+} is the simplest polyatomic system and is a key testing ground for the development of new techniques for calculating potential energy surfaces and predicting molecular spectra. Corrections that go beyond the Born-Oppenheimer approximation, including adiabatic, non-adiabatic, relativistic, and quantum electrodynamic corrections are becoming more feasible to calculatefootnote{O. Polyansky, textit{et al.}, emph{Phil. Trans. R. Soc. A} (2012), textbf{370}, 5014.}footnote{M. Pavanello, textit{et al.}, emph{J. Chem. Phys.} (2012), textbf{136}, 184303.}footnote{L. Diniz, textit{et al.}, emph{Phys. Rev. A} (2013), textbf{88}, 032506.}footnote{L. Lodi, textit{et al.}, emph{Phys. Rev. A} (2014), textbf{89}, 032505.}. As a result, experimental measurements performed on the chem{H_3^+} ion serve as important benchmarks which are used to test the predictive power of new computational methods. By measuring many infrared transitions with precision at the sub-MHz level it is possible to construct a list of the most highly precise experimental rovibrational energy levels for this molecule. Until recently, only a select handful of infrared transitions of this molecule have been measured with high precision ($sim$ 1 MHz)footnote{J. Hodges, textit{et al.}, emph{J. Chem. Phys} (2013), textbf{139}, 164201.}. Using the technique of Noise Immune Cavity Enhanced Optical Heterodyne Velocity Modulation Spectroscopy, we are aiming to produce the largest high-precision spectroscopic dataset for this molecule to date. Presented here are the current results from our survey along with a discussion of the combination differences analysis used to extract the experimentally determined rovibrational energy levels. Issue Date: 22-Jun-15 Publisher: International Symposium on Molecular Spectroscopy Citation Info: ACS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/79218 Date Available in IDEALS: 2016-01-05
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