High-precision R-branch transition frequencies in the ν2 fundamental band of H 3+

Adam J. Perry, James N. Hodges, Charles R. Markus, G. Stephen Kocheril, Benjamin J. McCall

Research output: Contribution to journalArticlepeer-review


The H3+ molecular ion has served as a long-standing benchmark for state-of-the-art ab initio calculations of molecular potentials and variational calculations of rovibrational energy levels. However, the accuracy of such calculations would not have been confirmed if not for the wealth of spectroscopic data that has been made available for this molecule. Recently, a new high-precision ion spectroscopy technique was demonstrated by Hodges et al., which led to the first highly accurate and precise (∼MHz) H3+ transition frequencies. As an extension of this work, we present ten additional R-branch transitions measured to similar precision as a next step toward the ultimate goal of producing a comprehensive high-precision survey of this molecule, from which rovibrational energy levels can be calculated.

Original languageEnglish (US)
Pages (from-to)71-73
Number of pages3
JournalJournal of Molecular Spectroscopy
StatePublished - Nov 1 2015


  • H 3+
  • High-precision spectroscopy
  • Ion spectroscopy
  • Rovibrational spectroscopy
  • Sub-Doppler spectroscopy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry


Dive into the research topics of 'High-precision R-branch transition frequencies in the ν2 fundamental band of H 3+'. Together they form a unique fingerprint.

Cite this