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Cold electron reactions producing the energetic isomer of hydrogen cyanide in interstellar clouds

MPG-Autoren
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Mendes,  Mario B.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Buhr,  Hendrik
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
Weizmann Institute of Science;

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Berg,  Max H.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Froese,  Michael
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Grieser,  Manfred
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Jordon-Thaden,  Brandon
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Krantz,  Claude
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Novotný,  Oldrich
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
Columbia Astrophysics Laboratory, MC 5247;

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Novotny,  Steffen
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Orlov,  Dmitry A.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Petrignani,  Annemieke
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Repnow,  Roland
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Schwalm,  Dirk
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Shornikov,  Andrey
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Stützel,  Julia
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Wolf,  Andreas
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Zitation

Mendes, M. B., Buhr, H., Berg, M. H., Froese, M., Grieser, M., Heber, O., et al. (2012). Cold electron reactions producing the energetic isomer of hydrogen cyanide in interstellar clouds. The Astrophysical Journal Letters, 746: L8, pp. 1-5. doi:10.1088/2041-8205/746/1/L8.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-000F-42E0-B
Zusammenfassung
Using event-by-event fragment momentum spectroscopy in a storage-ring merged-beams experiment, we find laboratory evidence that in the dissociative recombination (DR) of HCNH+ with cold electrons the energetic isomer HNC is produced with a high yield, similar to that of HCN. With a newly implemented mass-sensitive fragment imaging detector, we analyze the kinetic energy release of the triatomic fragments DCN/DNC from the DR reaction of the isotopologue DCND+with cold (near 10 K) electrons. The results show that the internal energy of these fragments is extremely high, far exceeding the isomerization barrier between DNC and DCN. From this laboratory characterization of the DR reaction we conclude that also the triatomic fragment HCN/HNC from the DR of HCNH+ will carry a large amount of ro-vibrational excitation and show that this implies an isomeric production ratio in a narrow range near unity.