Concentration of dimers for BCl<sub>3</sub> and rare gas atoms in BCl<sub>3</sub> isotope separation

In the low temperature environment generated by supersonic flow in process of laser assisted retardation condensation isotope separation for BCl<sub>3</sub>, molecular isotopes BCl<sub>3</sub> and carrier gas (rare (RG): He, Ne, Ar, Kr, Xe) can form BCl<sub>3</sub>:RG dimer via contact collision process. The mechanism relationship between concentration absolute involving molecules are great significance regulating selecting parameters. this work, based on analytic description anharmonic interaction potential function BCl<sub>3</sub>:RG, considering two-body three-body induced association dissociation dimers, dimers is obtained at a range 20–40 K. results as follows. dominant formation range. When initial molar fraction 0.01–0.10, changes approximately linearly with indicating that not only determines theoretical upper limit concentration, but also dominates chamber about 20 K, BCl<sub>3</sub>:Kr largest, concentrations other presented. Furthermore, we explain using simple model scale adjusting parameters energy stretching vibration frequency dimer.