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	References of "Zhang, Z.G" in Showing results 1 to 15 of 15 1 Radiative lifetime measurements in ErII by time-resolved laser spectroscopy Xu, H. L.; Jiang, Z. K.; Zhang, Z. G. et al in Journal of Physics B-Atomic Molecular and Optical Physics (2003), 36(9), 1771-1781 Radiative lifetimes of 30 excited states of Er 11, ranging in energy from 25 592 to 36 148 cm(-1), have been measured by means of a time-resolved laser-induced fluorescence (LIF) technique. Free, singly ... [more ▼] Radiative lifetimes of 30 excited states of Er 11, ranging in energy from 25 592 to 36 148 cm(-1), have been measured by means of a time-resolved laser-induced fluorescence (LIF) technique. Free, singly ionized erbium ions were produced in a laser-induced plasma. A tunable laser, with 1 ns duration pulse, was employed to selectively excite the Er+ ions. The lifetime values were evaluated from the transient LIF signals recorded by a fast detection system. A comparison of the new results with previously published values is given. HFR calculations, including core-polarization contributions, are found to be in reasonable agreement with experiment, but the present calculations clearly indicate that further laboratory and theoretical work is urgently needed, particularly for the low lying odd configurations of this complex ion. [less ▲] Detailed reference viewed: 16 (0 ULg) Time-resolved laser-induced fluorescence measurements of Rydberg states in Lu I and comparison with theory Dai, Z. W.; Jiang, Z. K.; Xu, H. L. et al in Journal of Physics B-Atomic Molecular and Optical Physics (2003), 36(3), 479-487 Time-resolved laser-induced fluorescence measurements have been performed for ten odd Rydberg states of neutral lutetium, belonging to the 6s(2)(S-1)np(n = 8-9) and 6 s(2)(S-1)nf (n = 5-8) series. For 6S ... [more ▼] Time-resolved laser-induced fluorescence measurements have been performed for ten odd Rydberg states of neutral lutetium, belonging to the 6s(2)(S-1)np(n = 8-9) and 6 s(2)(S-1)nf (n = 5-8) series. For 6S(2)(S-1)8p and 6s(2)(S-1)7f, the experimental lifetimes corresponding to the two J values within the doublet differ substantially. Comparison with theoretical values, calculated with extensive configuration interaction and core-polarization effects included, shows that the experimental trends are adequately reproduced both for np (n = 8-9) and nf (n = 5-8) states. [less ▲] Detailed reference viewed: 13 (3 ULg) Lifetime measurements and calculations in singly ionized ytterbium Biémont, Emile ; Quinet, Pascal ; Dai, Z. W. et al in Journal of Physics B-Atomic Molecular and Optical Physics (2002), 35(22), 4743-4749 New radiative lifetimes, measured by time-resolved laser-induced fluorescence spectroscopy, are reported for five Rydberg states of singly ionized ytterbium. Free Yb+ ions were produced in a laser-induced ... [more ▼] New radiative lifetimes, measured by time-resolved laser-induced fluorescence spectroscopy, are reported for five Rydberg states of singly ionized ytterbium. Free Yb+ ions were produced in a laser-induced plasma. The experimental results have been compared with HFR calculations, taking core-polarization effects into account, and a good agreement (within 25%) between theory and experiment is observed for four levels. HFR results are also proposed for np (n less than or equal to 7) and nf (n less than or equal to 8) Rydberg states and compared with available data. [less ▲] Detailed reference viewed: 5 (0 ULg) Radiative lifetime measurements and transition probability calculations in lanthanide ions Quinet, Pascal ; Palmeri, P.; Biémont, Emile et al in Journal of Alloys and Compounds (2002), 344(1-2), 255-259 We have undertaken a systematic investigation of spectroscopic properties of lanthanide ions (Z=57-71). Using time-resolved laser-induced fluorescence following one- or two-photon excitations, a large ... [more ▼] We have undertaken a systematic investigation of spectroscopic properties of lanthanide ions (Z=57-71). Using time-resolved laser-induced fluorescence following one- or two-photon excitations, a large number of radiative lifetimes have been measured at the Lund Laser Centre for singly, doubly and trebly ionized atoms. These new measurements have been used for testing theoretical calculations performed within the framework of a relativistic Hartree-Fock approach taking core-polarization effects into account. Using the experimental lifetimes (when available) and the theoretical branching fractions, a large number of transition probabilities, most of them of astrophysical interest, have been deduced and are stored in a new database (DREAM). Up to now, the results obtained concern the following ions: La2+, Ce2+, Ce2+, Pr2+, Ho2+, Er2+, Tm2+, Tm2+, Yb2+, Yb2+, Yb2+, Lu2+ and Lu2+. (C) 2002 Elsevier Science B.V. All rights reserved. [less ▲] Detailed reference viewed: 11 (0 ULg) Radiative lifetimes of 6sns S-3(1) and 6snd D-3(1) excited states of HgI Blagoev, K.; Pentchev, V.; Biémont, Emile et al in Physical Review A (2002), 66(3), Natural radiative lifetimes have been measured along the 6sns S-3(1) (n=7-10) and 6snd D-3(1) (n=6-11) Rydberg series of neutral mercury using time-resolved laser-induced fluorescence spectroscopy in a ... [more ▼] Natural radiative lifetimes have been measured along the 6sns S-3(1) (n=7-10) and 6snd D-3(1) (n=6-11) Rydberg series of neutral mercury using time-resolved laser-induced fluorescence spectroscopy in a laser-produced mercury plasma. The states of Hg I investigated in the present work were populated from the ground state by a stepwise excitation process. Relativistic Hartree-Fock calculations, including intravalence interactions and core-polarization effects, have been performed and the theoretical lifetimes have been compared with the measurements. [less ▲] Detailed reference viewed: 4 (0 ULg) Experimental and theoretical studies of DyIII: radiative lifetimes and oscillator strengths of astrophysical interest Zhang, Z. G.; Svanberg, S.; Palmeri, P. et al in Monthly Notices of the Royal Astronomical Society (2002), 334(1), 1-10 The lifetimes of three short-lived levels belonging to the 4f(9) 6p configuration and of two long-lived levels of the 4f(9) 5d configuration of Dy iii have been measured for the first time using time ... [more ▼] The lifetimes of three short-lived levels belonging to the 4f(9) 6p configuration and of two long-lived levels of the 4f(9) 5d configuration of Dy iii have been measured for the first time using time-resolved laser-induced fluorescence techniques. They are in good agreement with theoretical values calculated within the framework of a pseudo-relativistic configuration interaction approximation. Using the experimental lifetimes and the theoretical branching fractions, a first set of transition probabilities of astrophysical interest has been obtained for Dy III. [less ▲] Detailed reference viewed: 4 (1 ULg) Time-resolved laser-induced fluorescence lifetime measurements and theoretical transition probabilities in Tb III Biémont, Emile ; Garnir, Henri-Pierre ; Quinet, Pascal et al in Physical Review A (2002), 65(5), Lifetimes of four short-lived levels belonging to the 4f(8)(F-7)6p configuration of Tb III have been measured using a two-step excitation time-resolved laser-induced fluorescence technique. They agree ... [more ▼] Lifetimes of four short-lived levels belonging to the 4f(8)(F-7)6p configuration of Tb III have been measured using a two-step excitation time-resolved laser-induced fluorescence technique. They agree quite well with multiconfigurational relativistic Hartree-Fock calculations performed with inclusion of core-polarization effects. Using the experimental lifetimes and the theoretical branching fractions, a set of transition probabilities has been deduced for this ion. [less ▲] Detailed reference viewed: 12 (0 ULg) Lifetime measurements for doubly ionized uranium Biémont, Emile ; Palmeri, P.; Quinet, Pascal et al in Journal of Physics B-Atomic Molecular and Optical Physics (2002), 35(7), 1701-1705 The first lifetime measurements for doubly ionized uranium are reported in the present work. They relate to five levels belonging to the configurations 5f(2)6d(2), 5f(2)6d7s and 5f(3)7p and have been ... [more ▼] The first lifetime measurements for doubly ionized uranium are reported in the present work. They relate to five levels belonging to the configurations 5f(2)6d(2), 5f(2)6d7s and 5f(3)7p and have been obtained with a time-resolved laser-induced-fluorescence technique, the ions being produced by laser ablation of a uranium oxide target. [less ▲] Detailed reference viewed: 7 (0 ULg) Doubly ionized thorium: Laser lifetime measurements and transition probability determination of interest in cosmochronology Biémont, Emile ; Palmeri, P.; Quinet, Pascal et al in Astrophysical Journal (2002), 567(2, Part 1), 1276-1283 The first lifetime measurements have been performed for six levels of doubly ionized thorium, an important cosmochronometer in astrophysics for estimating the age of the Galaxy. The levels, belonging to ... [more ▼] The first lifetime measurements have been performed for six levels of doubly ionized thorium, an important cosmochronometer in astrophysics for estimating the age of the Galaxy. The levels, belonging to the 5f(2), 5f7p, 7s7p, and 6d7p configurations of Th III, have been measured by the time-resolved laser-induced fluorescence method and compared with relativistic Hartree-Fock calculations including configuration interaction and core-polarization effects. Taking advantage of the excellent agreement between theory and experiment, a first set of transition probabilities of astrophysical interest has been deduced for this ion from a combination of the experimental lifetimes and of the theoretical branching fractions. [less ▲] Detailed reference viewed: 8 (1 ULg) Time-resolved laser spectroscopy of multiply ionized atoms: Natural radiative lifetimes in CeIV Zhang, Z. G.; Svanberg, S.; Quinet, Pascal et al in Physical Review Letters (2001), 87(27), Radiative lifetimes have been measured for two excited levels of Ce IV using the time-resolved laser-induced fluorescence technique. Ce3+ ions were produced in a laser-induced plasma. In the measurements ... [more ▼] Radiative lifetimes have been measured for two excited levels of Ce IV using the time-resolved laser-induced fluorescence technique. Ce3+ ions were produced in a laser-induced plasma. In the measurements, a suitable magnetic field was applied to reduce the recombination between electrons and the ions and thus the background light from the recombination, and special care was exercised to avoid flight-out-of-view effects on the lifetime measurements for the high-velocity ions. The experimental lifetime results, tau = 30(2) ns for the level 49 737 cm(-1) and tau = 30(3) ns for the level 52 226 cm(-1), were compared with relativistic Hartree-Fock calculations (tau = 30.5 and 30.0 ns) indicating a particularly excellent agreement. [less ▲] Detailed reference viewed: 11 (0 ULg) Measurement of radiative lifetimes and determination of transition probabilities of astrophysical interest in HoIII Biémont, Emile ; Palmeri, P.; Quinet, Pascal et al in Monthly Notices of the Royal Astronomical Society (2001), 328(4), 1085-1090 Lifetimes of six levels belonging to the 4f(10)6p configuration of Ho III have been measured for the first time using the time-resolved laser-induced fluorescence method. They are compared with ... [more ▼] Lifetimes of six levels belonging to the 4f(10)6p configuration of Ho III have been measured for the first time using the time-resolved laser-induced fluorescence method. They are compared with multiconfigurational pseudo-relativistic Hartree-Fock calculations. A very good agreement is found. Using the experimental lifetimes and theoretical branching fractions, a first set of transition probabilities of astrophysical interest has been obtained for this ion. [less ▲] Detailed reference viewed: 4 (0 ULg) Experimental and Theoretical Energy Levels, Transition probabilities and Radiative Lifetimes in Yb III Biémont, Emile ; Garnir, Henri-Pierre ; Li, Z. S. et al in Journal of Physics : B Atomic Molecular & Optical Physics (2001), 34 Detailed reference viewed: 10 (1 ULg) Experimental and theoretical lifetimes in Yb III Zhang, Z. G.; Li, Z. S.; Svanberg, S. et al in European Physical Journal D -- Atoms, Molecules, Clusters & Optical Physics (2001), 15 Detailed reference viewed: 2 (0 ULg) Core-polarization effects and radiative lifetime measurements in Pr III Biémont, Emile ; Garnir, Henri-Pierre ; Palmeri, P. et al in Physical Review. A (2001), 64 Detailed reference viewed: 10 (0 ULg) Natural radiative lifetimes in Ce II Zhang, Z. G.; Svanberg, S.; Jiang, Z. et al in Physica Scripta (2001), 63 Detailed reference viewed: 6 (0 ULg) 1

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