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

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons30804

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

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30353

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

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30298

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

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30494

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

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30535

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

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30640

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

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30715

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

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30857

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

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30858

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

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30866

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

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30890

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

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30936

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

http://pubman.mpdl.mpg.de/cone/persons/resource/persons31023

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

http://pubman.mpdl.mpg.de/cone/persons/resource/persons31043

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

http://pubman.mpdl.mpg.de/cone/persons/resource/persons31091

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

http://pubman.mpdl.mpg.de/cone/persons/resource/persons31190

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

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Citation

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.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-42E0-B
Abstract
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.