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Photoinduced Formation of N2 Molecules in Ammonium Compounds
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmacy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Soft X-Ray Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Soft X-Ray Physics.
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2007 (English)In: Journal of Physical Chemistry A, ISSN 1089-5639, E-ISSN 1520-5215, Vol. 111, no 39, 9662-9669 p.Article in journal (Refereed) Published
Abstract [en]

Via fluorescence yield (FY) and resonant inelastic scattering spectroscopy in the soft X-ray range we find that soft X-rays induce formation of N2 molecules in solid NH4Cl and in related compounds. The nitrogen molecules form weak bonds in NH4Cl, so that a substantial fraction of the molecules remains in the sample. From measurements of the FY as a function of exposure and temperature, the rates for the photochemical processes are estimated. At elevated temperatures (363 K), several nitrogen atoms are removed from the sample per incoming photon. At lower temperatures (233 K), the rate is reduced to around 0.02 nitrogen atoms for each incoming photon. Virtually all these atoms form N2 molecules which are bound in the sample. The generality and implications of these results are briefly discussed.

Place, publisher, year, edition, pages
2007. Vol. 111, no 39, 9662-9669 p.
National Category
Natural Sciences Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-12036DOI: 10.1021/jp073620wISI: 000249838100005PubMedID: 17850051OAI: oai:DiVA.org:uu-12036DiVA: diva2:39805
Available from: 2008-06-10 Created: 2008-06-10 Last updated: 2017-12-11

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Gråsjö, JohanForsberg, JohanAndersson, EgilSöderström, JohanBergström, Christel

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Gråsjö, JohanForsberg, JohanAndersson, EgilSöderström, JohanBergström, Christel
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Department of PharmacySoft X-Ray PhysicsDepartment of PhysicsMolecular and condensed matter physicsSurface and Interface Science
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Journal of Physical Chemistry A
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