Experiments are described in which the time-dependence of the radiation intensities of Hg 3651A line were recorded after the cut-off of low pressure Hg-Ar discharges. It was found necessary to assume that this afterglow radiation is attributed to the recombination of electrons with molecular ions Hg
2+ and HgAr
+ The radiation decay time constants obtained from these spectroscopic data indicated that ambipolar diffusion is operative at low pressures, yielding the ambipolar diffusion coefficient
DaPAr=3×10
2cm
2s
-1 Torr. At high pressures, electron removal is principally by dissociative recombinaions with molecular ions Hg
2+ and HgAr
+. Conversion of the atomic ions Hg
+ to the molecular ions Hg
2+ and HgAr
+ according to the reactions Hg
++Hg+Ar→Hg
2++Ar and Hg
++2Ar→HgAr
++Ar is determined to occur at the rate of k
1/P
HgP
Ar=1.7×10
3s
-1 Torr
-2 and k
2/P
Ar2=20s
-1 Torr
-2 respectively.
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