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Rotational transitions of D 2 O with J < 12 in excited vibrational states (and the ground state) were measured with submegahertz precision in a pulsed discharge supersonic slit expansion of a D 2 O/NeHe mixture while scanning the range from 1473.69 to 1685.91 GHz using the Berkeley terahertz laser sideband spectrometer. Assignments were made using all(More)
Extensive mid-infrared lasing action by water molecules is observed in a supersonic plasma expansion contained inside an optical supercavity. An ion±electron dissociative recombination mechanism is proposed, that may also be relevant to atmospheric and astrophysical environments. Lasing action by water molecules excited through collisional pumping processes(More)
Technology associated with cavity ringdown laser absorption spectroscopy is reviewed. The technique is used to study general trace analysis, free radicals in flames and chemical reactors, molecular ions in electrical discharges, biological molecules and water clusters in supersonic jets, and vibrational overtones of stable molecules. Its specific enough to(More)
Broadband near-to-shot-noise suppression of the intensity noise from a continuous-wave (cw) fiber laser at 1550 nm is demonstrated at GHz-frequencies using feed-forward phase-matched destructive noise interference impressed onto the optical signal with a fiber electro-optic power modulator. The scheme is independent of the laser frequency and therefore is(More)
Mid-infrared laser lines observed in hydrogen/rare gas discharges are assigned to three-body recombination processes involving an electron, a rare gas (He or Ne) atom, and the triatomic hydrogen ion (H(3)(+)). Calculations of radiative transitions between neutral H(3) Rydberg states support this interpretation, and link it to recent results for(More)
We present the measurement and analysis of five new (D2O)5 bands via vibration-rotation-tunneling (VRT) spectroscopy as well as a preliminary description of a second (H2O)5 band. The vibrationally averaged rotational constants of all five fitted bands agree well with those from the two previously observed (D2O)5 bands and confirm that the pentamer averages(More)
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