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MO: Molekülphysik
MO 10: Poster: Spektroskopie, Photodiss., Theorie
MO 10.25: Poster
Mittwoch, 18. März 1998, 16:00–18:00, PF
Cavity ring down spectroscopy in a pulsed supersonic slit jet plasma — •Harold Linnartz, Tomasz Motylewski, and John P. Maier — Institute for Physical Chemistry, Klingelbergstrasse 80, CH4056 Basel
Cavity ring down (CRD) spectroscopy has proven to be a good
method to detect weak molecular transitions or species that
are hard to produce in large abundances. By combining a CRD
unit with a newly designed supersonic slit jet apparatus
very long absorption lengths have been obtained (up to
several km) in a dense and cold plasma. The set-up
will be discussed in the presentation.
Furthermore, the first gas phase spectra will be presented of
the 2Π ← X2Π transitions of C6H /
C6D and C8H / C8D. This is the first result
aimed at locating the electronic transitions of neutral
carbon chains, of astrophysical interest, in the gas phase.
Due to the low temperature in the 2-dimensional expansion
and the general lack of Doppler broadening, accurate
constants have been determined.