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The linewidth of ions has been observed to be systematically narrower thanthat of the coexisting neutrals in molecular clouds (Houde et al. 2000) andbeen interpreted as the signature of the decoupling of the neutral turbulencefrom magnetic fields in partially ionized medium (Li & Houde 2008; Paper I,hereafter). As a sequel of Paper I, here we present further observationalevidence that lend support to these earlier proposals with the velocitycoordinate spectrum analysis (Lazarian & Pogosyan 2006). We recover theturbulent energy spectra of HCN and HCO+(4-3) in a starless molecular filamentin NGC 6334 where magnetic fields play a dynamically important role (Li et al.2015). Our analysis showed that the neutral spectrum is consistent withKolmogorov-type (k^-5/3, where k is the wave number), while that of the ions isthe same on the large scale but steeper (k^-2) for scales smaller than 0.404pc.We carefully ruled out the possibilities that the spectrum difference can stemfrom the differences of ion and neutral optical depth and hyper-finestructures.

Probing the Turbulence Dissipation Range and Magnetic Field Strengths in Molecular Clouds. II. Directly Probing the Ion-neutral Decoupling Scale