title: UV photolysis of C4N2 in water ices: new possible route of synthesis of ammonium bicarbonate and ammonium formate.
abstract: Laboratory experiments involving ultraviolet (UV) irradiation of dicyanoacetylene (C(4)N(2)) trapped in water ice at 10 K have been conducted and monitored by infrared spectroscopy (FTIR). By the support of isotopic experiments and theoretical calculations, the irradiation of a DCA/H(2)O ice mixture at lambda > 230 nm has been found to be a possible source of NH(4)(+)HCO(3)(-) (ammonium bicarbonate) and NH(4)(+)HCOO(-) (ammonium formate). These latter compounds can arise from a proton-transfer reaction between H(2)O and the CN radical, which is issued from photolyzed C(4)N(2).
authors.affiliation: UMR CNRS 6633, Physique des Interactions Ioniques et Moléculaires, Equipe de Spectrométries et Dynamique Moléculaires, Université de Provence, Case 252, Centre de St-Jérôme, 13397 Marseille Cedex 20, France.
authors.forename: Zohra
authors.initials: Z
authors.lastname: Guennoun
authors.forename: Nathalie
authors.initials: N
authors.lastname: Piétri
authors.forename: Isabelle
authors.initials: I
authors.lastname: Couturier-Tamburelli
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Aycard