Mid- to far-infrared spectroscopy of Sharpless 171

Mid - to Far - Infrared spectroscopy of Sharpless 171 ⋆

We have collected one-dimensional raster-scan observations of the active star-forming region Sharpless 171 (S171), a typical H ii region-molecular cloud complex, with the three spectrometers (LWS, SWS, and PHT-S) on board ISO. We have detected 8 far-infrared fine-structure lines, [O iii] 52 µm, [N iii] 57 µm, [O i] 63 µm, [O iii] 88 µm, [N ii] 122 µm, [O i] 146 µm, [C ii] 158 µm, and [Si ii] 35...

Far infrared airborne spectroscopy.

Equipment and techniques employed in an airborne far ir (80-400 micro) spectral measurement of the solar brightness temperature are described, with particular attention paid to the scanning Michelson interferometer and the radiometric calibration. The airborne performance of several telescopic guiding systems, a liquid helium cooled bolometer, and golay cells are discussed, summarizing experien...

Mid-infrared upconversion spectroscopy

Tunable far-infrared spectroscopy extended to 9.1THz.

We synthesized tunable far-infrared radiation at frequencies higher than 9 THz (300 cm (-1)) by mixing CO(2) laser, (15)NH(3) laser, and microwave radiation in a W-Co metal-insulator-metal diode. We used this farinfrared radiation to accurately measure torsion-rotation transitions of CH(3)OH in the 8-9-THz region. We also measured the frequency of the aP(7, 3) (15)NH(3) laser transition.

Instrumentation for Far-infrared Spectroscopy

Measurements of far-infrared spectra are made far more difficult than the corresponding measurement of midor near-infrared spectra because of the weakness of the source. The spectral energy density of a blackbody at 1400 K is almost 5800 times weaker at 10 cm 1, and about 60 times weaker at 100 cm 1, than it is at 1000 cm 1. Since the sensitivity of any measurement of a midor far-infrared spect...