Observation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>2</mml:mn><mml:mi>p</mml:mi><mml:mn>3</mml:mn><mml:mi>d</mml:mi><mml:msup><mml:mo stretchy="false">(</mml:mo><mml:mn>1</mml:mn></mml:msup><mml:msup><mml:mi>P</mml:mi><mml:mi>o</mml:mi></mml:msup><mml:mo stretchy="false">)</mml:mo><mml:mo>→</mml:mo><mml:mn>1</mml:mn><mml:mi>s</mml:mi><mml:mn>3</mml:mn><mml:mi>d</mml:mi><mml:msup><mml:mo stretchy="false">(</mml:mo><mml:mn>1</mml:mn></mml:msup><mml:msup><mml:mi>D</

Kasthurirangan, S; Saha, Jayanta K.; Agnihotri, A. N.; Bhattacharyya, S.; Misra, Deepankar; Kumar, Awadhesh; Mukherjee, P. K.; Santos, J. P.; Costa, Ana Maria Medeiros da; Indelicato, P.; Mukherjee, Tapan Kumar; Tribedi, Lokesh C.

doi:10.1103/physrevlett.111.243201

Cited by 24 publications

(16 citation statements)

References 26 publications

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“…Four of the lowest levels, 1s2p 1 P 1 , 1s2p 3 P 2 , 1s2p 3 P 1 , and 1s2s 3 S 1 , are often used to test QED effects in helium-like ions (Chantler et al 2000;Bruhns et al 2007;Kubiček et al 2009Kubiček et al , 2013Amaro et al 2012;Chantler et al 2012;Rudolph et al 2013;Schlesser et al 2013;Kasthurirangan et al 2013;Payne et al 2014;Beiersdorfer & Brown 2015;Epp et al 2015). In Fig.…”

Section: Energy Levelsmentioning

confidence: 99%

“…The doubly excited states of helium-like ions have also been investigated in various experiments (O'Rourke et al 2008;Nandi 2008;Nakano et al 2012;Kasthurirangan et al 2013). The newly developed X-ray free-electron lasers (FEL) provide a unique opportunity to investigate the behavior of inner-shell vacancy ions (Young et al 2010;Bucksbaum et al 2011;Düsterer et al 2011;Kanter et al 2011;Meyer et al 2012).…”

Section: Introductionmentioning

confidence: 99%

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Energy levels and transition rates for helium-like ions withZ = 10–36

Guo

Wang

et al. 2016

A&A

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Aims. Helium-like ions provide an important X-ray spectral diagnostics in astrophysical and high-temperature fusion plasmas. An interpretation of the observed spectra provides information on temperature, density, and chemical compositions of the plasma. Such an analysis requires information for a wide range of atomic parameters, including energy levels and transition rates. Our aim is to provide a set of accurate energy levels and transition rates for helium-like ions with Z = 10-36. Methods. The second-order many-body perturbation theory (MBPT) was adopted in this paper. To support our MBPT results, we performed an independent calculation using the multiconfiguration Dirac-Hartree-Fock (MCDHF) method. Results. We provide accurate energies for the lowest singly excited 70 levels among 1snl (n ≤ 6, l ≤ (n − 1)) configurations and the lowest doubly excited 250 levels arising from the K-vacancy 2ln l (n ≤ 6, l ≤ (n − 1)) configurations of helium-like ions with Z = 10−36. Wavelengths, transition rates, oscillator strengths, and line strengths are calculated for the E1, M1, E2, and M2 transitions among these levels. The radiative lifetimes are reported for all the calculated levels. Conclusions. Our MBPT results for singly excited n ≤ 2 levels show excellent agreement with other elaborate calculations, while those for singly excited n ≥ 3 and doubly excited levels show significant improvements over previous theoretical results. Our results will be very helpful for astrophysical line identification and plasma diagnostics.

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Section: Energy Levelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy levels and transition rates for helium-like ions withZ = 10–36

Guo

Wang

et al. 2016

A&A

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“…The metastable bound states exhibit fluorescence decay where one electron of DES jumps to an energetically lower state giving rise to emission of a photon. On the basis of the criteria as provided by Saha et al the DESs are now classified into three groups, namely metastable‐bound, pure resonance, and fluorescence‐active resonance states . The autoionization decay rate for the fluorescence active resonance states are very small compared to that of pure resonance states of a particular symmetry .…”

Section: Introductionmentioning

confidence: 99%

Extensive investigations for metastable‐bound and resonance ³F^e states of He atom

Dutta

Sil²,

Saha

et al. 2019

Int J of Quantum Chemistry

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Evaluation of energy eigenvalues of first 19 metastable bound doubly excited states (DESs) arising from even parity F states of He atom are done within the framework of the Ritz variational principle. The wavefunction of the given state is constructed from different combinations of pf and dd configurations. The radial parts of the wavefunctions for both the configurations are expanded in Hylleraas type basis set.The nonlinear parameters of the Slater-type orbitals representing both the electrons are taken in geometrical sequence that span the radial space properly. The present calculated energies for the metastable bound states are lowest yet obtained. The resonance parameters that is, energy position and width of a large number of resonance states lying above He + (2p) threshold are evaluated by using stabilization method. The resonance parameters calculated in this work are in good agreement with the available theoretical results for the resonance states lying below He + (3p) threshold. The parameters for a large number of resonance states lying between He + (3p) andHe + (7p) thresholds are being reported for the first time. The effective quantum numbers of all the states considered in the present work are estimated by using quantum defect theory. Different structural properties for example, the one-and two-particle moments, virial factors, expectation values of interelectronic angles, two-particle radial probability densities, and so forth are estimated for both metastable-bound as well as resonance states. The present results can be used as a benchmark for future references. : 31.15.ac, 31.15.xt, 32.80.Zb, 32.80.Ee K E Y W O R D S autoionization, doubly excited states, electron correlation, He atom, Hylleraas coordinate, variational method PACS | INTRODUCTIONStructural properties of two-electron atoms have drawn attention to many theoreticians as well as experimentalists. In the beginning of this century, Tanner et al [1] published a review article on the studies of two-electron atoms. Investigations on two-electron atoms are of immense interest in recent years due to the nonseparability of the dynamical equation of motion. It provides a fundamental testing ground for various quantum chemical approximation methods for example, Feshbach projection operator formalism, [27][28][29] close-coupling approximation method, [30,31] multiconfigurational Hatree-Fock method, [32,33] hyperspherical close-coupling method based on numerical basis set, [34,35] complex-coordinaterotation (CCR) method with a finite numerical basis set built on the solutions of discretized one particle Hamiltonian, [36] CCR method with minor

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“…In this communication, we have made an attempt to estimate the energy eigenvalues of 2pnf

^{1, 3}

F e states (

n = 4 - 20

) of two‐electron systems (

Z = 3 - 18

) using trial wave function expanded in multiexponent Hylleraas type basis set. We have already used such type of wavefunction to determine the structural parameters of different S, P, and D states of free and confined two‐electron systems . It is worthwhile to mention that using Hylleraas basis the energy values of 2pnf

^{1, 3}

F e states

[n = 8 - 20]

of two electron atoms with Z > 10 are being reported for the first time.…”

Section: Introductionmentioning

confidence: 99%

Ritz variational method for the high‐lying nonautoionizing doubly excited ^1,3F^e states of two‐electron atoms

Dutta¹,

Sil²,

Saha

et al. 2017

Int J of Quantum Chemistry

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Energy eigenvalues of nonautoionizing doubly excited 1,3Fe states originating from 2pnf ( n=4−20) configuration of two‐electron atoms Z=3−18 have been calculated by expanding the basis set in explicitly correlated Hylleraas coordinates under the framework of Ritz variational method. A detailed discussion on the evaluation of correlated basis integrals is given. The energy eigenvalues of a number of these doubly excited states are being reported for the first time especially for the high lying states. The effective quantum numbers ( n∗) for the states mentioned above have been calculated by using the theory of quantum defect.

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Observation of2p3d(1Po)→1s3d(1D

Cited by 24 publications

References 26 publications

Energy levels and transition rates for helium-like ions withZ = 10–36

Energy levels and transition rates for helium-like ions withZ = 10–36

Extensive investigations for metastable‐bound and resonance ³F^e states of He atom

Ritz variational method for the high‐lying nonautoionizing doubly excited ^1,3F^e states of two‐electron atoms

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Observation of2p3d(1Po)→1s3d(1D

Cited by 24 publications

References 26 publications

Energy levels and transition rates for helium-like ions withZ = 10–36

Energy levels and transition rates for helium-like ions withZ = 10–36

Extensive investigations for metastable‐bound and resonance 3Fe states of He atom

Ritz variational method for the high‐lying nonautoionizing doubly excited 1,3Fe states of two‐electron atoms

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Extensive investigations for metastable‐bound and resonance ³F^e states of He atom

Ritz variational method for the high‐lying nonautoionizing doubly excited ^1,3F^e states of two‐electron atoms