| Popis: |
Gas-phase chemistry initiated by atomic silicon ions occurs in a variety of extraterrestrial environments including diffuse interstellar clouds,1 dense interstellar clouds,2 and the atmospheres of certain stars.3 Reliable observational evidence for extraterrestrial molecules containing Si exists for SiO, SiS and SiC2 but is limited otherwise, in contrast to evidence which has been obtained for larger numbers of molecules containing less abundant elements. This lack of observational evidence is partly due to the lack of experimental spectral information for relevant silicon-containing molecules. Such information is difficult to obtain in the terrestrial laboratory. Also, one needs to know which silicon-containing molecules to search for. Suggestions have been made in the past,4 but the basis of these suggestions is somewhat obscure. Here we explore experimentally the kinds of silicon-containing molecules which may be produced via the chemistry initiated by atomic silicon ions in the gas phase. |
Plný text