Quantitative velocity modulation spectroscopy.

Terahertz laser velocity modulation spectroscopy of ions

Velocity modulation spectroscopy has been investigated in the terahertz region, employing pure rotational transitions of ArH and rotation-tunneling transitions of H3O + to study the competition between pressure broadening and Doppler broadening on the lineshapes, neutral suppression, and modulation efficiency. Velocity modulation is demonstrated to be effective to frequencies as low as 60 cm , ...

Velocity-modulation infrared laser spectroscopy of molecular anions

http://www.jstor.org Velocity-Modulation Infrared Laser Spectroscopy of Molecular Anions Author(s): J. Owrutsky, N. Rosenbaum, L. Tack, M. Gruebele, M. Polak and R. J. Saykally Source: Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, Vol. 324, No. 1578, The Spectroscopy of Molecular Ions (Jan. 26, 1988), pp. 97108 Published by: Royal Socie...

Precision cavity enhanced velocity modulation spectroscopy

The new technique of cavity enhanced velocity modulation spectroscopy has been further developed, incorporating a tighter cavity to laser lock and an optical frequency comb for absolute frequency calibration. Several N2 transitions have been observed with much higher precision than previously possible, and transitions that were blended in earlier Doppler-limited experiments are now resolved. Th...

Cavity Enhanced Velocity Modulation Spectroscopy of C 2 H + 5 Brian Siller

Sub-Doppler mid-infrared spectroscopy of molecular ions

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 lm, and used it to record spectra of the R(...