Deuterium fractionation and the degree of ionisation in massive clumps within infrared dark clouds

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Table 10

The field-neutral coupling parameter (W), MHD cutoff wavelength (λ_min), and ambipolar diffusion timescale (τ_AD).

Source	W	λ_min	τ_AD^a
		[pc]	[10⁵ yr]

IRDC 18102-1800 MM1	18.5	0.018	37/162
G015.05+00.07 MM1	2.1	0.072	3/12
IRDC 18151-1208 MM2	2.6	0.065	2/9
G015.31-00.16 MM3	2.2	0.174	7/30
IRDC 18182-1433 MM2	6.0	0.044	16/65
IRDC 18223-1243 MM3	4.9	0.037	5/24
ISOSS J18364-0221 SMM1	8.9	0.036	12/54

Notes.

^(a)

The first τ_AD value was estimated from the computed value of W, and the second one was calculated by assuming that HCO⁺ is the dominant ionic species (see text).

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