The properties of polyketosulphides

Rotational Spectra of Selected Isotopic Species of Vinyl Cyanide: Molecular Structure and Quadrupole Hyperfine Structure

“…Linewidths as low as 7 kHz were ing point for the assignments of H 2 C|CDCN, and of achieved with a parallel nozzle setup (11). The precision H 2 C|CHCN substituted with 13 C and 15 N. It was straightand accuracy of strong, well resolved lines are believed to forward to assign lines at higher frequencies by simple bootbe {0.5 and {1 kHz, respectively. For closely spaced lines, strapping (16).…”

“…pomers (containing 13 C and 15 N) are weaker at room temperaRotational temperatures produced were Ç1 K (estimate of ture than those of the vibrationally excited molecules, and the temperature is from comparing the relative intensities of special care is required in making assignments.…”

“…ported eight transitions, having J Å 2-1 and J Å 3-2, of the 15 N and the three 13 C isotopomers of the normal species, The spectra have been measured with three different spec-H 2 C|CHCN, as well as four transitions, with J Å 2-1 and trometers: 6-5, of the deuterated species H 2 C|CDCN. They showed (i) A conventional 100 kHz Stark modulated spectrometer that the molecule is planar, and proposed a r s structure, in the frequency range 9-80 GHz: for the earliest measureexcept for the CH 2 group.…”

“…For the millimeter-mined, as described in the next section, and was used to wave and FTMW spectra of the undeuterated species all predict the rotational constants of the 13 C isotopomers of measurements were made on commercial samples of vinyl H 2 C|CDCN. cyanide in natural isotopic abundance.…”

“…first expanded the early investigations of the 13 C-and 15 Nsubstituted species of H 2 C|CHCN, and have then underThe rotational spectrum of vinyl cyanide (acrylonitrile), taken measurements for the same isotopic substitutions of H 2 C|CHCN, a well-known interstellar molecule, has been the deuterated form H 2 C|CDN. In addition, small numbers the subject of several investigations in the microwave and of lines of both the H 2 C|CHCN and H 2 C|CDCN species millimeter-wave ranges, where there are strong transitions with a cis-or trans-D substitution in the CH 2 group have (1).…”