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 language||English (US)|
|Number of pages||6|
|Journal||Chemical Physics Letters|
|State||Published - Nov 1 2012|
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry