ELECTRON-ION RECOMBINATION RATE COEFFICIENTS FOR C II FORMING C I

Journal Article · Tue Jul 10 00:00:00 EDT 2012 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/753/2/132· OSTI ID:22039378

Ali, S; Orban, I; Mahmood, S; Schuch, R ^[1]; Altun, Z ^[2]; Glans, P ^[3]

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1. Department of Physics, Stockholm University, AlbaNova S-106 91 Stockholm (Sweden)
2. Department of Physics, Marmara University, 81040 Istanbul (Turkey)
3. Department of Physics Natural Sciences, Engineering and Mathematics, Mid Sweden University, 85170 Sundsvall (Sweden)

We have determined absolute dielectronic recombination rate coefficients for C II, using the CRYRING heavy-ions storage ring. The resonances due to 2s-2p (n = 0) core excitations are detected in the center-of-mass energy range of 0-15 eV. The experimental results are compared with intermediate coupling AUTOSTRUCTURE calculations. Plasma rate coefficients are obtained from the DR spectrum by convoluting it with a Maxwell-Boltzmann energy distribution for temperatures in the range of 10{sup 3}-10{sup 6} K. The derived temperature-dependent plasma recombination rate coefficients are presented graphically and parameterized by using a fit formula for convenient use in plasma modeling codes. The experimental rate coefficients are also compared with the theoretical data available in literature. In the temperature range of 10{sup 3}-2 Multiplication-Sign 10{sup 4} K, our experimental results show that previous calculations severely underestimate the plasma rate coefficients and also our AUTOSTRUCTURE calculation does not reproduce the experimental plasma rate coefficients well. Above 2 Multiplication-Sign 10{sup 4} K, the agreement between the experimental and theoretical rate coefficients is much better, and the deviations are smaller than the estimated uncertainties.

• OSTI ID: 22039378
• Journal Information: Astrophysical Journal, Vol. 753, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
A CODES
BOLTZMANN STATISTICS
CARBON IONS
COMPUTERIZED SIMULATION
ELECTRON-ION COLLISIONS
ENERGY SPECTRA
EV RANGE
EXCITATION
INTERMEDIATE COUPLING
PLASMA
PLASMA SIMULATION
RECOMBINATION
RESONANCE
TEMPERATURE DEPENDENCE