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Title:High-precision sub-doppler infrared spectroscopy of HeH+
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: Astronomical Molecular Spectroscopy in the Age of ALMA
Abstract:The helium hydride ion, HeH$^+$, is the simplest heteronuclear diatomic, and is composed of the two most abundant elements in the universe. It is widely believed that this ion was among the first molecules to be formed; thus it has been of great interest to scientists studying the chemistry of the early universe.\footnote{S. Lepp, P.~C. Stancil, A. Dalgarno \emph{J. Phys. B} (2002), \textbf{35}, R57.}\footnote{S. Lepp, \emph{Astrophys. Space Sci.} (2003), \textbf{285}, 737.} HeH$^+$ is also isoelectronic to H$_2$ which makes it a great target ion for theorists to include adiabatic and non-adiabatic corrections to its Born-Oppenheimer potential energy surface. The accuracy of such calculations is further improved by incorporating electron relativistic and quantum electrodynamic effects.\footnote{K. Pachucki, J. Komasa, \emph{J. Chem. Phys} (2012), \textbf{137}, 204314.}\\ Using the highly sensitive spectroscopic technique of Noise Immune Cavity Enhanced Optical Heterodyne Velocity Modulation Spectroscopy (NICE-OHVMS) we are able to perform sub-Doppler spectroscopy on ions of interest. When combined with frequency calibration from an optical frequency comb we fit line centers with sub-MHz precision as has previously been shown for the H$_{3}$$^+$, HCO$^{+}$, and CH$_{5}$$^{+}$ ions.\footnote{J.~N. Hodges, A.~J. Perry, P.~A. Jenkins II, B.~M. Siller, B.~J. McCall \emph{J. Chem. Phys.} (2013), \textbf{139}, 164201.} Here we report a list of the most precisely measured rovibrational transitions of HeH$^+$ to date. These measurements should allow theorists to continue to push the boundaries of \textit{ab initio} calculations in order to further study this important fundamental species.
Issue Date:2014-06-20
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:Perry, A.J.; McCall, B.J.; Jenkins II, P.A.; Kocheril, G.S.; Markus, C.; Hodges, J.N. HIGH-PRECISION SUB-DOPPLER INFRARED SPECTROSCOPY OF HeH+. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.FA01
Rights Information:Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License.
Date Available in IDEALS:2014-09-17

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