Collision Phenomena Involving Highly-Charged Ions in Astronomical Objects

Chutjian, A.

doi:10.1007/978-94-017-0542-4_3

Cited by 3 publications

(2 citation statements)

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“…require the development of powerful relativistic many-body methods. The spectra of multi-charged ions are of immense interest in many areas of physics; particularly in x-ray space astronomy, plasma physics and laser physics [11,12]. Accurate values of ionization potentials (IPs), double ionization potentials (DIPs), and excitation energies (EEs), especially from the deep core orbitals, are required for setting up the probe and its tunability of the ionizing beam in experiments like e-2e, e-3e, γ-2e, double Auger decay etc [13,14].…”

Section: Introductionmentioning

confidence: 99%

Relativistic equation-of-motion coupled-cluster method: Application to closed-shell atomic systems

et al. 2014

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We report our successful implementation of the full fledged relativistic equation of motion coupled cluster (EOMCC) method. This method is employed to compute the principal ionization potentials (IPs) of closed-shell rare gas atoms, He-like ions, Be-like ions along with Na + , Al + , K + , Be, and Mg. Four component Dirac spinors are used in the calculations and the one and two electron integrals are evaluated using the Dirac Coulomb Hamiltonian. Our results are in excellent agreement with those available measurements, which are taken from the National Institute of Science and Technology database (NIST). We also present results using the second order many-body perturbation theory (MBPT(2)) and random phase approximation (RPA) in the EOMCC framework. These results are compared with those of EOMCC at the level of single and double excitations in order to assess the role of the electron correlation effects in the intermediate schemes considered in our calculations .

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Section: Introductionmentioning

confidence: 99%

Relativistic equation-of-motion coupled-cluster method: Application to closed-shell atomic systems

et al. 2014

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“…This procedure can be useful insofar as the underlying Einstein A values for emission, or the cross sections for electron-impact excitation, are accurately known. If one observes in an astronomical plasma two optical transitions, the first an allowed transition from an upper level k to the ground state g and the second a forbidden transition from a metastable level i to g, then the ratio R of these intensities can serve as a diagnostic of the plasma electron density N e and possibly of the electron temperature T e (Keenan 1993;Chutjian 2003). This intensity ratio R is given in terms of the atomic parameters as…”

Section: Introductionmentioning

confidence: 99%

Measurement of the Metastable Lifetime for the 2s²2p²¹S₀Level in O²⁺

Smith

Čadeź

Chutjian

et al. 2004

ApJ

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The radiative lifetime of the 2s 2 2p 2 1 S 0 level in O 2+ has been measured via the magnetic-dipole (M1) transition 2s 2 2p 2 1 S 0 ! 3 P 1 at 232.17 nm. Data were recorded in a Kingdon trap, with the source of ions a 14 GHz electron cyclotron resonance ion source. The lifetime of the 1 S 0 level was found to be 540 AE 27 ms. This is in good agreement with a previous measurement and with a number of theoretical calculations. Metastable lifetimes, when combined with collisional excitation rates, can provide a diagnostic for electron density N e in a stellar or solar plasma.

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