Sub-Doppler mid-infrared spectroscopy of molecular ions

Kyle N. Crabtree, James N. Hodges, Brian M. Siller, Adam J. Perry, Joseph E. Kelly, Paul A. Jenkins, Benjamin J. McCall

Research output: Contribution to journalArticlepeer-review


The technique of velocity modulation spectroscopy has recently been combined with cavity enhancement and frequency modulation methods into a technique called noise-immune cavity-enhanced optical heterodyne velocity modulation spectroscopy (NICE-OHVMS). We have implemented NICE-OHVMS with a cw-optical parametric oscillator (OPO) tunable from 3.2 to 3.9 μm, and used it to record spectra of the R(1,0) and R(1,1) u transitions of the ν 2 fundamental band of H 3 +. The high optical power and cavity enhancement enable saturation of rovibrational transitions, which allows for line center frequencies to be measured with a precision of 70 kHz.

Original languageEnglish (US)
Pages (from-to)1-6
Number of pages6
JournalChemical Physics Letters
StatePublished - Nov 1 2012

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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