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Based on recent work, formamide might be a potentially very importantmolecule in the emergence of terrestrial life. Although detected in theinterstellar medium for decades, its formation route is still debated, whetherin the gas phase or on the dust grain surfaces. Molecular deuteration hasproven to be, in other cases, an efficient way to identify how a molecule issynthesised. For formamide, new published observations towards theIRAS16293-2422 B hot corino show that its three deuterated forms have all thesame deuteration ratio, 2--5%, and that this is a factor 3--8 smaller than thatmeasured for H2CO towards the IRAS16293-2422 protostar. Following a previouswork on the gas-phase formamide formation via the reaction NH2 + H2CO -> HCONH2+ H, we present here new calculations of the rate coefficients for theproduction of monodeuterated formamide through the same reaction, starting frommonodeuterated NH2 or H2CO. Some misconceptions regarding our previoustreatment of the reaction are also cleared up. The results of the newcomputations show that, at the 100 K temperature of the hot corino, the rate ofdeuteration of the three forms is the same, within 20%. On the contrary, thereaction between non-deuterated species proceeds three times faster than thatwith deuterated ones. These results confirm that a gas-phase route for theformation of formamide is perfectly in agreement with the availableobservations.

New quantum chemical computations of formamide deuteration support a gas-phase formation of this prebiotic molecule