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Keywords:

  • multiple bonds;
  • phosphorous;
  • quantum-chemical calculations;
  • rotational spectroscopy;
  • silicon
Thumbnail image of graphical abstract

Curiouser and curiouser: By combining high-resolution molecular spectroscopy in the centimeter and millimeter wave regions, and high-level coupled-cluster quantum-chemical calculations, the structure of the HPSi molecule has been determined. The bridged geometry of HPSi is in remarkable contrast to that of the C and/or N analogues, such as HCN/HNC, HCP, and HNSi, which are all linear.