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The isomerization between vinylidene and acetylene is an important prototype of intramolecular H migration,and has attracted much attention.[1-3] The lifetime of vinylidene had long been accepted as being very short,however,in 1998,a very long lifetime of at least 3.5 microseconds was claimed in coulomb explosion imaging (CEI) experiments.[2] Previous approximate and reduced dimensional quantum dynamics calculations also yielded lifetimes with large discrepancies.We report the first full-dimensional quantum dynamics calculations of resonance decay lifetimes of vinylidene and vinylidene-d2 on an ab initio potential energy surface.