Direct Evidence for Ammonium Ion Formation in Ice through Ultraviolet-induced Acid-Base Reaction of NH3 with H3O+

Details Direct Evidence for Ammonium Ion Formation in Ice through Ultraviolet-induced Acid-Base Reaction of NH3 with H3O+ Direct Evidence for Ammonium Ion Formation in Ice through Ultraviolet-induced Acid-Base Reaction of NH3 with H3O+

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...713..906m&link_type=abstract

The Astrophysical Journal, Volume 713, Issue 2, pp. 906-911 (2010).

Biology

4

Astrobiology, Astrochemistry, Ism: Molecules, Methods: Laboratory, Molecular Processes, Ultraviolet: Ism

Scientific paper

We present direct evidence for ammonium ion (NH4 +) formation through ultraviolet (UV) photolysis of NH3-H2O mixture ice that does not contain acids. NH4 + forms by the reaction of NH3 with protonic defects (H3O+) in the UV-photolyzed ice. Our observations may explain the deficient counter-anions in interstellar ice relative to the abundance of NH4 +. Also, H3O+ may play an important role in the acid-base chemistry of interstellar ice in UV-irradiating environments. IR absorption results suggest that NH4 + is a potential contributor to the interstellar 6.85 μm band but is not a dominant component.

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