Knowledge Bank

CsF produced by reactively scattered beams of Cs and $SF6$ has been studied in a molecular beam electric resonance spectrometer. The radio frequency rotational transitions $(\Delta M=\pm 1,\Delta J=0)$ with resolved vibrational structure are observed. It is found that the lowest four vibrational states are appreciably populated. The relative intensities of the observed lines can be described approximately by a Boltzmann distribution corresponding to a temperature of about $800\circ K$. This distribution is qualitatively different from that predicted by a simple spectator-stripping reaction mechanism.