The Rotational Spectrum of Fluoroethyne (HCCF) Revisited

The rotational spectrum of fluorotetraacetylene produced by electric discharge

“…The cyanopolyynes, HA(CBC) n ACN, for which the longest chain molecule studied in the laboratory corresponds to n ¼ 8 [1], are well known examples of this study. For monofluoroacetylenes, a related series of molecules, spectroscopic studies have been reported only for the shortest members [3][4][5][6]. This lack of data are due to their unstability at room temperature.…”

“…The discovery that electric discharges efficiently produced fluoroacetylenes [7] stimulated the rotational study of these species. The first members of the series, fluoroacetylene [3] and fluorodiacetylene [4], were generated in dc glow discharge experiments and studied in the millimeter wave frequency range. The combination of pulsed-discharge nozzles [8] and molecular beam Fourier transform microwave (MB-FTMW) spectroscopy [9][10][11][12][13], first introduced by Grabow et al [9], turned out to be a powerful tool for the investigation of unstable species generated in electric discharges.…”

Precise Lamb-dip measurements of millimeter and submillimeter wave rotational transitions of 16O12C32S

“…The synthesizers were stabilized against a 10 MHz Meinberg GPS 166 Satellite controlled clock having a frequency stability Df/f of $10 À9 (for some description of the Kiel spectrometer see Ref. [13] Lamb-dip geometry of the spectrometer includes a wire grid polarizer at one side of the gas cell (length 4.2 m, diameter 10 cm) and a roof top reflector at the other side to get two waves propagating in opposite directions. The wire grid polarizer led the radiation to an InSb-bolometer cooled down to 4.2 K by means of a Quantum Technology closed cycle cooling device.…”