A Mössbauer study of iron bonding to solid ammonia and its photofragments

Paul H. Barrett; Moshe Pasternak

doi:10.1063/1.438793

A Mössbauer study of iron bonding to solid ammonia and its photofragments

Paul H. Barrett^*, Moshe Pasternak

^*Corresponding author for this work

School of Physics and Astronomy

University of California at Santa Barbara

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13 Scopus citations

Abstract

Mössbauer studies of isolated ⁵⁷Fe atoms in solid ammonia (0.1% Fe) at low temperatures suggest the formation of a FeNH₃ molecule characterized by a quadrupole coupling constant |e²qQ/2| = 1.90(5) mm·s^-1 and isomer shift δ = +0.60(5) mn·s^-1 with respect to iron metal. Irradiating with a visible-UV Xe-source results in photolyzed species revealing two doublets, with hyperfine constants different from the parent molecule. To the more intense site we assign a FeNH₂ formulation and to the low intensity doublet, a FeNH molecuie. Both isomer shift and quadrupole splitting systematics are consistent with a single ammonia molecule bound to iron via the nitrogen atom. Absorbers prepared with higher concentrations of ⁵⁷Fe (0.6%) show additional lines superimposed on the typical FeNH₃ doublet.

Original language	English
Pages (from-to)	3837-3840
Number of pages	4
Journal	The Journal of Chemical Physics
Volume	71
Issue number	9
DOIs	https://doi.org/10.1063/1.438793
State	Published - 1979

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abstract = "M{\"o}ssbauer studies of isolated 57Fe atoms in solid ammonia (0.1% Fe) at low temperatures suggest the formation of a FeNH3 molecule characterized by a quadrupole coupling constant |e2qQ/2| = 1.90(5) mm·s-1 and isomer shift δ = +0.60(5) mn·s-1 with respect to iron metal. Irradiating with a visible-UV Xe-source results in photolyzed species revealing two doublets, with hyperfine constants different from the parent molecule. To the more intense site we assign a FeNH2 formulation and to the low intensity doublet, a FeNH molecuie. Both isomer shift and quadrupole splitting systematics are consistent with a single ammonia molecule bound to iron via the nitrogen atom. Absorbers prepared with higher concentrations of 57Fe (0.6%) show additional lines superimposed on the typical FeNH3 doublet.",

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AB - Mössbauer studies of isolated 57Fe atoms in solid ammonia (0.1% Fe) at low temperatures suggest the formation of a FeNH3 molecule characterized by a quadrupole coupling constant |e2qQ/2| = 1.90(5) mm·s-1 and isomer shift δ = +0.60(5) mn·s-1 with respect to iron metal. Irradiating with a visible-UV Xe-source results in photolyzed species revealing two doublets, with hyperfine constants different from the parent molecule. To the more intense site we assign a FeNH2 formulation and to the low intensity doublet, a FeNH molecuie. Both isomer shift and quadrupole splitting systematics are consistent with a single ammonia molecule bound to iron via the nitrogen atom. Absorbers prepared with higher concentrations of 57Fe (0.6%) show additional lines superimposed on the typical FeNH3 doublet.

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A Mössbauer study of iron bonding to solid ammonia and its photofragments

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