Other
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.4602z&link_type=abstract
American Astronomical Society, AAS Meeting #212, #46.02; Bulletin of the American Astronomical Society, Vol. 40, p.244
Other
Scientific paper
At present, over 140 different chemical compounds have been identified in interstellar and circumstellar gas. Such observations have offered a unique avenue by which to probe the cold, dense regions in our Galaxy and in external galaxies. Because these molecules are primarily present in colder material, they are usually studied at high spectral resolutions (1 part in 106-107) via their pure rotational transitions, which typically occur at millimeter and sub-millimeter wavelengths. Such studies cannot be carried out, however, without the input of high resolution laboratory spectroscopy. Such measurements provide the "fingerprint” spectral pattern critical for accurate astronomical identifications. Because of the complexity of current interstellar spectra and the propensity of unidentified features, precise laboratory data are essential. Current methods employed in the laboratory for high resolution measurements include millimeter/sub-mm direct absorption, velocity modulation, and Fourier transform microwave spectroscopy (FTMW). Each of these experimental techniques has certain unique advantages, which will be discussed. Also of importance are the synthetic methods utilized to create the radicals, ions, and other transient species typically found in interstellar space. Such molecules are generated in DC and AC glow discharges, pulsed supersonic jet expansions, and using Broida-type ovens. In addition, spectral analyses can be quite complex, in particular if there are low lying excited torsional or electronic states, or if molecular inversion is present. Recent laboratory results for potential interstellar species will also be presented, in particular those for negative ions, phosphorus-bearing radicals, and organic "prebiotic” species.
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