Energy levels, oscillator strengths and lifetimes in Ar V |
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Authors: | Vikas Tayal G P Gupta and A N Tripathi |
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Abstract: | We have calculated the excitation energies, oscillator strengths and transition probabilities for electric-dipole-allowed
and intercombination transitions among the 46 LS levels belonging to the configurations 3s
23p
2, 3s3p
3, 3s
23p3d, 3p
4, 3s
23p4s, 3s
23p4p, 3s3p
2(2
S)4s, 3s3p
2(2
P)4s, 3s3p
2(4
P)4s, 3s3p
2(2
D)4s, 3s
23p4d and 3s
23p4f of Si-like Argon. These states are represented by extensive Configuration-Interaction (CI) wavefunctions obtained using the
CIV3 computer code of Hibbert. From our transition probabilities we have also calculated the radiative lifetimes of singlet
and triplet states of Ar V. Our results are compared with other available theoretical calculations and experimental data.
To assess the importance of relativistic effects on our calculated values, we have also carried out calculations in the intermediate-coupling
scheme using the Breit-Pauli Hamiltonian. Small adjustments to the diagonal elements of the Hamiltonian matrices have been
made so that the energy splittings are as close as possible to the experimentally compiled energy values of the National Institute
for standards and Technology (NIST). The energy splitting of 85 fine-structure levels, the oscillator strengths and transition
probabilities for electric-dipole-allowed and intercombination transitions and the lifetimes of some fine-structure levels
are presented and compared with available experimental and other theoretical values. In this calculation, we also predict
new data for several fine-structure levels where no other theoretical and experimental results are available. |
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Keywords: | |
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