Fig. 1.
Relative alignment of the molecular states as a function of the ratio, vdrift/vth, of the ambipolar drift velocity to the thermal velocity for different anisotropy-parameters b/a. On the right-hand axis we note the associated predicted optically thin polarization fraction of a J = 3 − 2 transition (see Eq. (7)). For the HCO+–H2 complex, we assume b/a = 0.4.
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