Locked-dipole capture rate constant

Equation (16) represents the locked-dipole capture rate constant. The first term, which at the same time is the high-temperature limit, denotes the well-known Langevin rate constant... 

Figure 3. Thermal rate constants for capture of HC1 by H3 (PST locked-dipole capture corresponding to phase-space theory, Eq. (16) SACM statistical adiabatic channel model, Eqs. (26)-(34) [15] SACMci classical SACM, Eqs. (28H31) [15] CT classical trajectories, Eqs. (26) and (27) [1]).

Here R is the vector between the centers of mass of the ion, with charge q, and the molecule, with isotropic polarizability a and dipole moment fiD, and 0 is the angle that R makes with the direction of the dipole. If 0 can be assumed constant (the Locked Dipole approximation ), then simple capture theory results in a rate constant expression which increases with decreasing temperature according to This phenomenon of a nega-... 

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