共查询到20条相似文献,搜索用时 15 毫秒
1.
A. V. Volotka D. A. Glazov G. Plunien V. M. Shabaev I. I. Tupitsyn 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,38(2):293-298
The one-electron quantum-electrodynamic corrections to the
magnetic-dipole transition amplitude
between the fine-structure
levels (1s2 2s2 2p) 2P3/2 - 2P1/2 in boronlike ions
are calculated to all orders in αZ. The results obtained
serve for improving the theoretical accuracy of the lifetime of the
(1s2 2s2 2p) 2P3/2 level in boronlike argon. 相似文献
2.
G. P. Gupta A. Z. Msezane 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2008,49(2):157-160
Excitation energies from ground state for 97 fine-structure levels as well as oscillator strengths and radiative decay rates
for all electric-dipole-allowed and intercombination transitions among the fine-structure levels of the terms belonging to
the (1s
22s
22p
6)3s
23p, 3s
3
p
2, 3s
23d, 3p
3, 3s3p3d, 3p
23d, 3s3d
2, 3s
24s, 3s
24p, 3s
24d, 3s
24f, and 3s3p4s configurations of Co XV are calculated, using extensive configuration-interaction (CI) wave functions, obtained with the
CIV3 computer code of Hibbert. The important relativistic effects in intermediate coupling are included through the Breit-Pauli
approximation via spin-orbit, spin-other-orbit, spin-spin, Darwin and mass correction terms. Small adjustments to the diagonal
elements of the Hamiltonian matrices have been made. Our calculated excitation energies, including their ordering, are in
excellent agreement with the experimental results and the experimentally compiled energy values of the National Institute
for Standards and Technology (NIST) wherever available. The mixing among several fine-structure levels is found to be very
strong, with most of the strongly mixed levels belonging to the (1s
22s
22p
6)3p
23d and 3s3d
2 configurations. The strong mixing among several fine-structure levels makes it very difficult to identify them uniquely.
Perhaps, that may be the reason for the lack of both experimental and theoretical results for these levels. We believe that
our extensive calculated values can guide experimentalists in identifying the fine-structure levels in their future work.
From our radiative decay rates we have also calculated radiative lifetimes of some fine-structure levels. In this calculation
we also predict new data for several fine-structure levels where no other theoretical and/or experimental results are available. 相似文献
3.
E. Biémont P.-D. Dumont H.P. Garnir P. Palmeri P. Quinet 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2002,20(2):199-204
Theoretical transition probabilities have been obtained for 54 n = 3 transitions depopulating the 3s3p
1Po, 3p2
3P, 1D, 1S, 3s3d
1D, 3D and 3p3d
3Po, 3Do, 3Fo, 1Fo, 1Do, 1Po levels, including 14 transitions not yet observed. Some of these predictions have been compared with experimental lifetimes
obtained by beam-foil spectroscopy for four n = 3 levels of K7+. An excellent agreement is observed between theory and experiment for all the levels.
Received 23 January 2002 / Received in final form 23 April 2002 Published online 19 July 2002 相似文献
4.
N. Singh A. K.S. Jha M. Mohan 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,38(2):285-291
Breit-Pauli Energy levels, oscillator strengths and transition probabilities
for all the transitions in Cl I between the fine structure levels of
3s2 3p5, 3s2 3p43d, 3s2 3p44s and 3s23p44p states are calculated using extensive configuration interaction (CI) wave functions. We have also determined the lifetimes
of 3s2 3p43d, 3s2 3p44s and 3s2 3p44p levels. The
relativistic effects are included through Breit-Pauli approximation via spin-orbit, Darwin and mass correction terms. Prior
to the calculations of the oscillator strengths and transition probabilities, we fine-tune the CI coefficient using experimental
energies. Our results are compared with experimental and other available theoretical data. The calculated energy levels are
in close agreement with most of the NIST compiled data. We predict new lifetime data for several levels where no other theoretical
and/or experimental results are available, which will form the basis for the
future experimental work.
Electronic supplementary material Online Material 相似文献
5.
É. Biémont H.-P. Garnir P.-H. Lefèbvre P. Palmeri L. Philippart P. Quinet D. Rostohar C. J. Zeippen 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,40(1):91-99
Oscillator strengths have been calculated for the transitions depopulating levels of the 3s23p3, 3s3p4 configurations of K V, of the 3s23p2, 3s3p3 configurations of K VI and of the 3s23p, 3s3p2, 3p3 and 3s3p3d configurations of K VII. A multiconfiguration Dirac-Fock method, incorporating the relativistic two-body Breit
interaction and quantum electrodynamics corrections due to self-energy and vacuum polarization, has been used for the calculations.
The reliability of this approach has been tested by comparison with relativistic Hartree-Fock calculations and also with some
experimental measurements performed by beam-foil spectroscopy at a beam energy of 1.7 MeV. 相似文献
6.
N. Bhattacharya B. Bapat S.A. Rangwala S.V.K. Kumar E. Krishnakumar 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》1998,2(2):125-129
Lifetime measurements have been carried out for some low lying (n
= 2) levels in the four-electron ions Cl XIV and S XIII using the beam-foil technique. Accurate oscillator strengths for the
2
s2
1
S
- 2
s
2
p
1
P
o transition have been determined by the inclusion of prominent cascades in the analysis. Lifetimes of the levels of the 2
p2
3
P
j multiplet have also been measured for both ions. The results are compared with theoretical predictions and earlier measurements.
Received: 29 October 1997 / Revised: 10 February 1998 / Accepted: 5 March 1998 相似文献
7.
Sabyasachi Kar Y.K. Ho 《Journal of Quantitative Spectroscopy & Radiative Transfer》2007,107(2):315-322
We have investigated the effect of surrounding plasmas on several singly excited and doubly excited meta-stable bound states of helium atom using highly correlated basis functions for singly excited S, P, D states and CI-type basis functions for doubly excited meta-stable D states. Plasma effect is taken care of by using a screened Coulomb (Yukawa) potential obtained from the Debye model that admits a variety of plasma conditions, and such a model plays an important role in plasma spectroscopy. The wavelengths for transitions from the 1snp 1P° (n=2,3)→1s21Se, 1snp 3P° (n=2,3)→1s2s 3Se, 2pnp 1Pe (n=3,4)→1s2p 1P°, 2pnp 3Pe (n=2,3)→1s2p 3P°, 2pnd 1D° (n=3,4)→1s3d 1De, 2pnd 3D° (n=3,4)→1s3d 3De, 2p3p 1Pe→2pnd 1D° (n=3,4), 2pnd 1D°(n=3, 4)→2p4p 1Pe, 2pnp 3Pe (n=2,3)→2p3d 3D°, and 2pnp 3Pe (n=2,3)→2p4d 3D° of helium atom in plasmas for various Debye lengths are reported. 相似文献
8.
9.
Relativistic calculations of 3s2 1S0-3s3p 1P1 and 3s2 1S0-3s3p 3P1,2 transition probabilities in the Mg isoelectronic sequence
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Using the multi-configuration Dirac-Fock self-consistent field method and the relativistic configuration-interaction method,calculations of transition energies,oscillator strengths and rates are performed for the 3s 2 1 S 0-3s3p 1 P 1 spinallowed transition,3s 2 1 S 0-3s3p 3 P 1,2 intercombination and magnetic quadrupole transition in the Mg isoelectronic sequence(Mg I,Al II,Si III,P IV and S V).Electron correlations are treated adequately,including intravalence electron correlations.The influence of the Breit interaction on oscillator strengths and transition energies are investigated.Quantum electrodynamics corrections are added as corrections.The calculation results are found to be in good agreement with the experimental data and other theoretical calculations. 相似文献
10.
A. K.S. Jha P. Jha S. Tyagi M. Mohan 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,39(3):391-398
We present relativistic close-coupling photoionization calculations of Al IV
using the Breit-Pauli R-matrix method to obtain photoionization cross-section of Al IV from the ground state and the lowest
two J=0 (even) excited
states. A multi-configuration eigenfunctions expansion of the core Al V is
employed with spectroscopic configurations 2s22p5,
2s2p6,
2s22p43s, 2s22p43p, 2s22p43d and
2s22p44s. We have included, for the first time, the lowest 68
level target states of Al V in the photoionization calculations of Al IV.
Extensive configuration interaction wavefunctions are used to describe both
the initial Al IV states and the final Al V states. Cross-sections are
compared from three level calculations including only 2s2 2p5 2Po
3/2, 1/2 and 2s 2p6
2S1/2 levels of Al
V. The present calculation using the lowest 68 target levels of Al V are
presented for the first time and should provide reasonably complete database
for practical application for photoionization cross-section for Al IV, where
high-energy cross-sections along with near-threshold photoionization cross-section is required. 相似文献
11.
Radiative lifetime measurements of odd-parity high-excited levels of Sn I by time-resolved laser spectroscopy
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Natural radiative lifetimes of five higher-lying odd-parity levels
5p7s 3P1o, 5p5d 1P1o, 5p6d 3F2o, 3D1o and 3F3o in
neutral tin are measured by the time-resolved laser-induced
fluorescence (TR-LIF) technique and the atomic beam method. All
these lifetimes are not longer than 100 ns and they are found to be
shorter than the lifetimes of even-parity levels in the same energy
region. The results reported in this paper provide important
transition parameters for highly-excited atomic Sn, which may be useful
for theoretically calculating excited heavy atoms. 相似文献
12.
A. A. Buchachenko 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2011,61(2):291-296
The finite-field scalar relativistic coupled cluster and configuration
interaction, as well as the spin-orbit configuration interaction,
methods are employed to calculate the static dipole polarizabilities for the
lowest (6s
2) 1S, (6s6p) 1,3^{1,3}Po and (6s5d) 1,3^{1,3}D excited
states of atomic ytterbium. The results agree very well with existing
experimental and best
theoretical data and refine the set of ytterbium polarizabilities known so
far. Similar techniques are used to calculate the electric quadrupole moments
for the 1,3^{1,3}Po and 1,3^{1,3}D states. 相似文献
13.
14.
Zishi Jiang Sabyasachi Kar Y.K. Ho 《Journal of Quantitative Spectroscopy & Radiative Transfer》2012,113(1):75-81
Doubly-excited 1,3Pe and 1,3Do states of Li II, Be III, B IV, C V are calculated using highly correlated exponential wave functions within the framework of Ritz variational principle. The wavelengths for the 2pnp 1Pe→2pn′d 1Do (n, n′≤7) and 2pnp 3Pe→2pn′d 3Do (n, n′≤7) transitions are reported. Our present results for the 2pnp 1,3Pe and 2pnd 1,3Do states energies are accurate in precision compared to the results of previous calculations. Comparisons are also made with the experimental results. The effective quantum numbers (n?) for the 2pnp 1,3Pe and 2pnd 1,3Do states are also reported. 相似文献
15.
N. N. Kolachevskiĭ A. A. Papchenko N. A. Kiselev V. N. Sorokin A. V. Akimov S. I. Kanorskii 《Optics and Spectroscopy》2001,90(2):164-170
Spectra of saturated absorption of Sm atomic vapor from the ground state 7 F 0 and the first even metastable level 7 F 1, ε′=292.58 cm?1 of the 4f 66s 2 configuration to the odd level 4f 6(7 F)6s6p(3 P o)9 F 1 o , ε,=14863.85 cm?1 were recorded. The lines of the isotopic series were identified, and the hyperfine structure of lines in the spectra of isotopes with a nonzero nuclear spin was determined. The relative isotopic shifts and the hyperfine splitting of the even level 4f 66s 2(7 F 1) were determined. 相似文献
16.
Summary We report the measurements of the3
D(3s4d)-3
P(3s3p)3
D(3s5d)-3
P(3s3p), and3
P(3p
2)-3
P(3s3p) transition frequency of MgI, the fine-structure separation and isotope shift between24Mg and26Mg. The measurements have been performed in a metastable atomic beam; a good agreement is found for data already existing
in the literature. The accuracy of the measurements reported in this paper is mainly limited by the Doppler broadening of
theI
2 transitions used as a reference and by the precision in the knowledge of the related wavelengths. 相似文献
17.
J. Franzke H. D. Wizemann K. Niemax C. Vadla 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2000,8(1):23-28
The collisional broadening and shift rate coefficients of the 283.39 nm (6p
2
3P0 → 7s
3P1
o
), 364.06 nm (6p
2
3P1 → 7s
3P1
o
), 368.45 nm (6p
2
3P1 → 7s
3P0
o
) and 405.90 nm (6p
2
3P2 → 7s
3P1
o
) Pb lines by He and Ar have been measured by fitting the experimental absorption line shapes to theoretical Voigt profiles.
The absorption measurements were performed in a resistively heated, Pb loaded oven with an integrated dc noble gas discharge
to produce also Pb atoms in the 6p
2
3P1 and 6p
2
3P2 metastable states. The diffusion of the metastable atoms out of the discharge zone into the neutral noble-gas atmosphere
enabled the line-shape and shift measurement of the lines involving the metastable states without the influence of the discharge
plasma. 相似文献
18.
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. 相似文献
19.
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. In the calculations, multiconfiguration Dirac--Fork wave functions have been applied to describe the target-ion states and relativistic distorted-wave calculation has been performed to generate fine-structure collision strengths. The collision strengths are then averaged over a Maxwellian distribution of electron velocities in order to generate the effective collision strengths. The calculated rate coefficients are compared with available experimental and theoretical data, and some good agreements are found for the outer shell electron excitations. But for the inner shell electron excitations there are still some differences between the present calculations and available experiments. 相似文献
20.
E. Biémont P. Palmeri P. Quinet E. Träbert C.J. Zeippen 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2002,20(1):37-44
Transitions between the five fine-structure levels in the 3s
23p
3 ground configuration of Fe XII (P-like) are of interest in astrophysics and terrestrial plasma diagnostics. The decay rates
give rise to level lifetimes in the millisecond range, which have been measured recently at a heavy-ion storage ring. While
most of the 3s
23p
23d levels are short-lived, two of these levels have no E1 decay channels and may also have millisecond lifetimes. We present
HFR and MCDF calculations of the E1, M1, E2 and M2 transition rates between the 3s
23p
3, 3s3p4 and 3s
23p
23d levels and compare the lifetime results to most recent experimental data as well as to other predictions.
Received 2 October 2001 / Received in final form 22 January 2002 Published online 28 June 2002 相似文献