Dissociative recombination measurements of NH{sup +} using an ion storage ring
- Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027 (United States)
- Max Planck Institute for Nuclear Physics, D-69117 Heidelberg (Germany)
We have investigated dissociative recombination (DR) of NH{sup +} with electrons using a merged beams configuration at the TSR heavy-ion storage ring located at the Max Planck Institute for Nuclear Physics in Heidelberg, Germany. We present our measured absolute merged-beams recombination rate coefficient for collision energies from 0 to 12 eV. From these data, we have extracted a cross section, which we have transformed to a plasma rate coefficient for the collisional plasma temperature range from T {sub pl} = 10 to 18,000 K. We show that the NH{sup +} DR rate coefficient data in current astrochemical models are underestimated by up to a factor of approximately nine. Our new data will result in predicted NH{sup +} abundances lower than those calculated by present models. This is in agreement with the sensitivity limits of all observations attempting to detect NH{sup +} in interstellar clouds.
- OSTI ID:
- 22365071
- Journal Information:
- Astrophysical Journal, Vol. 792, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
APPROXIMATIONS
ASTROPHYSICS
COLLISIONAL PLASMA
COLLISIONS
CONFIGURATION
COSMIC GASES
CROSS SECTIONS
ELEMENT ABUNDANCE
EV RANGE
HEAVY IONS
INTERSTELLAR SPACE
MOLECULAR IONS
MOLECULES
NITROGEN HYDRIDES
RECOMBINATION
SENSITIVITY
STORAGE RINGS