Laboratory spectroscopy of H+3

Benjamin J. McCall

Research output: Contribution to journalArticlepeer-review


The experimental determination of the low-lying rovibrational energy levels of H+3 using high-resolution, high-sensitivity infrared laser spectroscopy has confirmed this ion's equilateral triangle equilibrium geometry, provided direct information on its quantum mechanical characteristics, and enabled its extensive study in planetary ionospheres and in the interstellar medium. Since the discovery of the ν2 ← 0 fundamental band, the laboratory spectroscopy of H+3 has been pushed to higher energies through the study of vibrational hot bands, overtones, forbidden bands and combination bands. We review the 20 years of laboratory spectroscopy of this important ion, discuss our recent work on the ν1 + 2ν22 ← 0 and 2ν1 + ν2 ← 0 bands, and examine the prospects for the future of H+3 spectroscopy.

Original languageEnglish (US)
Pages (from-to)2385-2401
Number of pages17
JournalPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Issue number1774
StatePublished - Jan 1 2000


  • Infrared spectroscopy
  • Molecular ions, h
  • Plasma spectroscopy

ASJC Scopus subject areas

  • Mathematics(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Laboratory spectroscopy of H<sup>+</sup><sub>3</sub>'. Together they form a unique fingerprint.

Cite this