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Tuesday, August 4, 2020 | History

2 edition of **Rate coefficients for the electron-impact excitations of C-like ions** found in the catalog.

Rate coefficients for the electron-impact excitations of C-like ions

Yukikazu Itikawa

- 356 Want to read
- 8 Currently reading

Published
**1985**
by Institute of Plasma Physics, Nagoya University in Nagoya, Japan
.

Written in English

- Nuclear excitation.,
- Electron impact ionization.,
- Cross sections (Nuclear physics)

**Edition Notes**

Includes bibliographical references.

Statement | Yukikazu Itikawa. |

Series | IPPJ-AM ;, 38 |

Classifications | |
---|---|

LC Classifications | QC794.6.E9 I82 1985 |

The Physical Object | |

Pagination | 23 p. : |

Number of Pages | 23 |

ID Numbers | |

Open Library | OL2276926M |

LC Control Number | 89167553 |

COLLISIONAL IONIZATION EQUILIBRIUM FOR OPTICALLY THIN PLASMAS. I. UPDATED RECOMBINATION RATE COEFFICIENTS FOR BARE THROUGH SODIUM-LIKE IONS P. Bryans,1 N. R. Badnell,2 T. W. Gorczyca,3 J. M. Laming,4 W. Mitthumsiri,1 and D. W. Savin1 Received April 17; accepted June This Chapter deals with internal transitions, induced by electron impact, of diatomic molecules initially in a given quantum state, with particular emphasis on the vibrational excitations.

@article{osti_, title = {Electron impact excitation rate coefficients for P-like Ni XIV}, author = {Wang, K. and Shanghai EBIT Lab, Institute of Modern Physics, Department of Nuclear Science and Technology, Fudan University, Shanghai and Yan, J. and Center for Applied Physics and Technology, Peking University, Beijing and Huang, M. and Shanghai . Vibrational Excitation Rate Coefficients The electron impact excitation rate coefficients for eight ground state vibrational levels of N2 are given in Table 1 as a function of electron temperature. These rates refiect the normalization of the 4 2.

However, because the rate coefficient of electron impact detachment (e + H − ⇒ 2e + H) is also high speed, H − will lose electrons rapidly after it is produced. Of the other two reactions that produce negative ions, the faster is the OH − reaction. Gain coefficients are calculated for neon-like gallium and germanium ions. Shorter wavelengths are calculated and predicted to be emitted. The gain coefficients are calculated among energy levels of the neon-like ions. Collisional excitations were calculated through the distorted wave approximations through five electron temperatures Te = , , , and eV.

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Rate coefficients for electron-impact direct ionization, excitation It is the main reason why the EA rate coefficients for the excitations to energy levels of these configurations are diminished. The presented results demonstrate the importance of the various levels of W 26+ in the formation of the W 27+ ion by electron-impact by: 4.

Electron impact excitation in Ar + ions has been studied by using fully relativistic distorted wave theory. Calculations are performed to obtain the excitation cross-sections and rate-coefficients for the transitions from the ground state 3p 5 (J=3/2) to fine-structure levels of excited states 3p 4 4s, 3p 4 4p, 3p 4 5s, 3p 4 5p, 3p 4 3d and 3p 4 zation of the Cited by: Plasma rate coefficients (PRCs) for electron-impact single ionization of ground-state Xe q+ ions in the temperature range 2 × 10 5 − Rate coefficients for the electron-impact excitations of C-like ions book × 10 7 K have been derived from a combination of experimental cross-section data and results of distorted-wave calculations.

For Xe 8+ and Xe 9+ new measurements were performed and thoroughly analyzed with respect to the Cited by: 5. Rate coefficients for electron-impact excitation have been calculated for transitions from the ground state to {ital n}=3 excited states of six neonlike ions with atomic numbers {ital Z}=15, This paper calculates the electron impact excitation rate coefficients from the ground term 2s22p2 3P to the excited terms of the 2s22p2, 2s2p3, 2s22p3s, 2s22p3p, and 2s22p3d configurations of N II.

Cross sections and rate coefficients were determined for charge states q ranging from q = 1 to q = 5 for photoionization, for q = 1 up to q = 19 for electron-impact ionization and for q = 18 to q. We present collision strengths and rate coefficients for electron-impact excitation of He-like ions (S 14+, Ar 16+, Ca 18+) using the Dirac Atomic R-matrix Code, which has been developed by Norrington and Grant [J.

Phys. B: At. Mol. Opt. Phys. 20 () ].The lowest 45 target levels are included in the calculation to obtain the rate coefficients for the 1s 2 1 S 0. An extensive calculation for electron impact excitation cross-sections of Kr + ion is performed using relativistic distorted wave theory.

The transitions considered are from the ground state i.e. 4s 2 4p 5 (J=3/2) to the 4s 2 4p 5 (J = 1/2), 4s4p 6 (J=1/2) levels and fine structure levels of 4s 2 4p 4 5s, 4s 2 4p 4 5p, 4s 2 4p 4 6s, 4s 2 4p 4 6p, 4s 2 4p 4 4d and 4s 2 4p 4 5d excited states. Cross sections or effective collision strengths are compiled for electron-impact excitation of helium atoms and He-like ions.

An evaluation is made to identify the “best” determined values for use for the transitions 1 1 S−2 1,3 S and 1 1 S−2 1,3 P of target ions of Z = 2, 3, 6, 8, 12, 20, 22, 26, 28, 34, and The resulting evaluated data are fitted to an analytical.

Atomic structure data, electron impact excitations and ionization cross sections of tungsten ions, W44+, have been calculated using the multi-configuration Dirac–Fock and R-matrix methods for a.

Molecular R-matrix calculations are performed to obtain rotational excitation rate coefficients for electron collisions with the symmetric-top ions H+3 and.

Theoretical vibrational-excitation cross sections and rate coefficients for electron-impact resonant collisions involving rovibrationally excited N 2 and NO molecules. V Laporta 1,2, R Celiberto 2,3 and J M Wadehra 4. Published 13 September • IOP Publishing Ltd Plasma Sources Science and Technology, Vol Number 5.

Electron-ion recombination of carbon-like Ar 12+ forming Ar 11+ has been investigated for the first time by using the cooler storage ring CSRm at the Institute of Modern Physics in Lanzhou, China. The absolute recombination rate coefficients are derived from the measurement in the electron-ion collision energy range of 0–50 eV, covering dielectronic.

select article Electron-impact cross sections and rate coefficients for excitations of carbon and oxygen ions. Electron-impact cross sections and rate coefficients for excitations of carbon and oxygen ions.

Itikawa, S. Hara, T. Kato, S. Nakazaki, D.H. Crandall. Within our general effort to provide reliable rate coefficients for the photorecombination (PR) and electron-impact ionization (EII) of astrophysically relevant atomic ions [11–14] we here publish experimental rate coefficients for the PR of Si 10+ forming Si 9+ and of Si 9+ forming Si 8+.

For the measurements the electron–ion merged-beams. In Figure 3, we show the degrees of linear polarization of X-ray emissions following the 3 d → n f (n = 4, 5, 6) electron-impact excitations of W 43 + and W 42 + ions just as examples.

Again, the results for W 46 + –W 44 + ions are not given here owing to very similar characteristics shown in the figure. As seen clearly, the X-ray emissions. Cross sections and thermally-averaged rate coefficients for vibration (de-)excitation of HeH + by an electron impact are computed using a theoretical approach that combines the multi-channel quantum defect theory and the UK R-matrix code.

Fitting formulas with a few numerical parameters are derived for the obtained rate coefficients. The interval of. Absolute excitation and ionization rate coefficients have been evaluated for arbitrary excited states at certain electron temperatures kTe and their corresponding electron densities Ne of the Lithium‐like ions Si XII and S XIV.

The populations of the chosen excited levels are calculated namely, for the doublet state of the Li‐like ions. The calculations have been carried out by.

Cross sections and thermal rate coefficients for rotational and vibration excitation of the four stable isotopologues of the 4 HeH + ion by electron impact are presented.

The data are calculated using a previously developed theoretical approach. The obtained rate coefficients are fitted to analytical formulas with the 10–10, K interval of applicability.

Theoretical Electron- Impact Excitation, Ionization and Recombination Rate Coefficients and Level Population Densities for Scandium-Like Ion A.I.

Refaie*, H. El Sharkawy, S. Allam and Th. El Sherbini Laboratory of Lasers and New Materials, Physics Department, Faculty of Science, Cairo University, Giza, Egypt. *E-mail: [email protected] Lotz, Electron impact ionization cross section and ionization rate coefficients for atoms and ions.

Astrophysical Journal Supplement. An empirical formula for the electron-impact ionization cross-section, Zeitschrift für Physik A Hadrons and Nuclei, (2): –Google Scholar; 2. W. Lotz, Electron impact ionization cross section and ionization rate coefficients for atoms and ions.

Astrophysical Journal Supplement, –Journal Article: Electron-impact ionization of P-like ions forming Si-like ions.