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The present work reports results of the semi-empirical determination of thespontaneous emission transition probabilities (Einstein coefficients) forQ-branch lines of Fulcher-$\alpha$ band system and radiative lifetimes of upperelectronic-vibro-rotational (rovibronic) levels for the most importantisotopologues of diatomic hydrogen. They are based on an adiabatic theoreticalmodel and all currently available experimental data on rovibronic energylevels, ratios of the line strengths and the lifetimes. Numerical data arepresented in tabular format for vibrational quantum numbers v=0-7 (N is thequantum number of total angular momentum of the molecule excluding electron andnuclear spins). The uncertainties (one SD) of experimental and semi-empiricaldata are listed for each datum. Currently available results of ab initiocalculations are listed and may be used for comparisons. For the$d^3\Pi_u^-$,v=4-6,N=1 levels of the $H_2$ molecule the lifetimes caused bypredissociation via non-adiabatic interaction with continuum of the$c^3\Pi_u^-$ electronic state were estimated for the first time in the basis ofexperimental and semiempirical data.

Tables of Einstein coefficients and lifetimes of upper rovibronic levels  for Q-branch lines of the the $d^3\Pi_u^- - a^3\Sigma_g^+$ bands for the  $H_2$, HD, $D_2$, and $T_2$ molecules