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1.
Th. M. El Sherbini 《Zeitschrift für Physik A Hadrons and Nuclei》1976,32(1):325-327
Relative line strengths have been calculated for transitions between states of the 4p
4 5p and 4p
4 5s configurations in Kr II. The wavefunctions are obtained in intermediate coupling, including an effective correction for configuration interaction. Absolute values for the line strengths are determined using the coulomb approximation. Lifetimes for the upper 4p
4 5p levels are given together with available experimental results for comparison. 相似文献
2.
Th. M. El Sherbini 《Zeitschrift für Physik A Hadrons and Nuclei》1976,276(4):325-327
Relative line strengths have been calculated for transitions between states of the 4p 4 5p and 4p 4 5s configurations in Kr II. The wavefunctions are obtained in intermediate coupling, including an effective correction for configuration interaction. Absolute values for the line strengths are determined using the coulomb approximation. Lifetimes for the upper 4p 4 5p levels are given together with available experimental results for comparison. 相似文献
3.
G. H. Cavalcanti F. O. Borges A. J. Mania R. V. Orloski A. G. Trigueiros 《Journal of Quantitative Spectroscopy & Radiative Transfer》2005,90(3-4):291-308
The weighted oscillator strengths (gf) and the lifetimes for Si II presented in this work were carried out in a multiconfiguration Hartree–Fock relativistic (HFR) approach. In this calculation, the electrostatic parameters were optimized by a least-squares procedure, in order to improve the adjustment to experimental energy levels. This method produces gf-values that are in better agreement with intensity observations and lifetime values that are closer to the experimental ones. In this work we presented all the experimentally known electric dipole Si II spectral lines. 相似文献
4.
U. Fink S. Bashkin W. S. Bickel 《Journal of Quantitative Spectroscopy & Radiative Transfer》1970,10(12):1241-1256
Beam-foil spectra of neon, argon, krypton, and xenon have been recorded photographically with a fast spectrograph. The particle energies ranged from 150 to 750 keV. Transitions in Ne II, III; Ar II, III; Kr II, III; and Xe II have been identified. In addition, new multiples were identified in Ne II and Xe II and a number of unidentified lines were observed in neon, argon, and krypton. Characteristic intensity decays of over 170 lines were measured, giving the mean lives of ≈ 80 levels, with an estimated error of 30 per cent. Tabulation of energy levels with similar electron configurations in neon, argon, krypton, and xenon shows a definite progression to larger mean lives as the nuclear change increases. 相似文献
5.
Semi-empirical weighted oscillator strengths (gf) and lifetimes presented in this work for all experimentally known electric dipole P XII spectral lines and energy levels
were computed within a multiconfiguration Hartree-Fock relativistic approach. In this calculation, the electrostatic parameters
were optimized by a leastsquares procedure in order to improve the adjustment to experimental energy levels. The method produces
lifetime and gf values that are in agreement with intensity observations used for the interpretation of spectrograms of solar and laboratory
plasmas. 相似文献
6.
The lifetimes of ten levels of the xenon atom and two levels of the ion were measured. The probabilities for several transitions are calculated. The effective decay cross section is calculated for collisions for the 2p8 level of the xenon atom.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii Fizika, No. 3, pp.24–29, March, 1971.The authors thank V. S. Mel'chenko for assistance in this study. 相似文献
7.
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
8.
W. -D. Zeitz D. Alber H. Grawe H. Haas R. Keitel H. -E. Mahnke W. Semmler R. Sielemann 《Zeitschrift für Physik A Hadrons and Nuclei》1982,308(3):227-235
The level structure of123Xe has been studied with the114Cd (12C, 3n) and?Cd (13C, 4n) reactions using in-beamγ-ray spectroscopy. The yrast cascade on the low lying odd parity states originating from theh 11/2 neutron orbital has been investigated yielding lifetimesτ of 18(3) ps, 2.2 (4) ns and 17(2) ns for the 15/2?, 11/2? and 9/2? states, respectively. Theg-factor of thet 1/2=5.2 μs isomer has been measured to beg=?0.256(2). From the time differential observation of the electric quadrupole interaction in a114Cd single crystal the spin of this isomer has been determined to be 7/2 and from the coupling constante 2 Qq/h=116(2) MHz the quadrupole moment was deduced. The results are discussed in the framework of the triaxial rotor plus particle model. 相似文献
9.
10.
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
11.
12.
13.
A.J. Mania F.R.T. Luna F.O. Borges G.H. Cavalcanti 《Journal of Quantitative Spectroscopy & Radiative Transfer》2009,110(18):2162-2173
The semi-empirical weighted oscillator strengths (gf) and the lifetimes presented in this work for all experimentally known electric dipole S V spectral lines and energy levels were carried out in a multiconfiguration Hartree–Fock relativistic (HFR) approach. In this calculation, the electrostatic parameters were optimized by a least-squares procedure, in order to improve the adjustment to experimental energy levels. This method produces lifetime values and gf values that are in agreement with intensity observations used for the interpretation of spectrograms of solar and laboratory plasmas. 相似文献
14.
15.
16.
I. D. Petsalakis 《Molecular physics》2013,111(4):333-342
Ab initio multireference configuration interaction calculations have been carried out on the lower-lying electronic states of BH and their nonadiabatic interactions. The ab initio data have been included in subsequent calculations involving solution of the complex eigenvalue Schrödinger equation to determine predissociation widths and lifetimes of vibrational-rotational levels of these states. Secondly, previously calculated ab initio data on the Rydberg states and their nonadiabatic interactions have been included in multi-state vibrational calculations on the 3p and 3d complexes in BH and BD. The results are in good agreement with the experimental analysis of the 3p and 3d spectra in BH and BD. Furthermore, interaction of the 3d states with the neighbouring 4s state is also found to be important. 相似文献
17.
Vikas Tayal G. P. Gupta 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2007,44(3):449-457
Excitation energies from ground state for 86 fine-structure levels as well
as oscillator strengths and radiative decay rates for all fine-structure
transitions among the levels of the terms
(1s22s22p6)3s2(1S), 3s3p(1,3Po),
3s3d(1,3D), 3s4s(1,3S), 3s4p(1,3Po), 3s4d(1,3D),
3s4f(1,3Fo), 3p2(1S, 3P, 1D),
3p3d(1,3Po, 1,3Do, 1,3Fo),
3p4s(1,3Po), 3p4p(1,3S, 1,3P, 1,3D),
3p4d(1,3Po, 1,3Do, 1,3Fo), 3p4f(1,3D,
1,3F, 1,3G) and 3d2(1S, 3P, 1D, 3F,1G) of Cr
XIII 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. The mixing among several
fine-structure levels is found to be very strong. Our excitation energies,
including their ordering, are in excellent agreement (better than 0.5%)
with the available experimental results. From our transition probabilities,
we have also calculated radiative lifetimes of some fine-structure levels.
Our calculated lifetime for the longer-lived level 3s3p(3P1) is
found to be in excellent agreement with the experimental result of Curtis
compared to other theoretical calculations. 相似文献
18.
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
19.
The weighted oscillator strengths gf and the lifetimes for S XIV presented in this work have been calculated in a multiconfigurational Hartree–Fock relativistic
approach. In this calculation, the electrostatic parameters were optimized by a least-squares procedure in order to improve
the adjustment to experimental energy levels. This method produces gf values that are in better agreement with observed line intensities and lifetime values closer to the experimentally determined
ones. In this work we presented all the experimentally known electric dipole S XIV spectral lines.
Published in Zhurnal Prikladnoi Spektroskopii, Vol. 76, No. 3, pp. 473–476, 2009. 相似文献