共查询到20条相似文献,搜索用时 31 毫秒
1.
S. Kröger I. K. Öztürk F. G. Acar G. C. Başar G. Başar J.-F. Wyart 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2007,41(1):61-70
A parametric analysis of the fine and the magnetic dipole hyperfine structure
for the three configurations of odd parity 4d35s5p, 4d45p and
4d25s25p was performed.
Effective one-electron parameters were determined and
theoretical predictions are given for the magnetic dipole
hyperfine structure constants A
for the levels of these three configurations.
Additionally,
12 new energy levels could be found, four of odd and eight of even parity,
by re-analysing data for experimental wavelengths of Nb. 相似文献
2.
N. Jaritz H. Jäger L. Windholz 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2002,18(3):267-276
We have classified about 200 new lines and have discovered 13 energy levels with even parity and 1 level with odd parity by
means of the systematic hyperfine structure investigation of a large number of spectral lines of the neutral tantalum atom.
For the new levels we deduced their angular momenta, parity and magnetic hyperfine interaction constants A as well as the electric quadrupole interaction constants B.
Received 8 August 2001 相似文献
3.
P. Głowacki A. Krzykowski A. Jarosz 《The European physical journal. Special topics》2013,222(9):2345-2351
Measurements of the hyperfine structure (hfs) of electronic levels of the chromium atom were performed using two spectroscopic methods. For 7 energy levels (3 even parity and 4 odd parity) the magnetic dipole and electric quadrupole hyperfine interaction constants A and B were determined for the first time. In this case the method of laser induced fluorescence (LIF) on an atomic beam was used. The low lying metastable levels belonging to the term 3d44s2 a5D were remeasured by the method of laser-rf double resonance on an atomic beam (ABMR-LIRF). To improve the accuracy of hyperfine splittings measurements, the stability of the radio frequnecy (rf) generator was increased by the use of a frequency standard synchronized by a GPS signal. The values of the hfs intervals for these levels were determined with the accuracy of a few kHz. The improvement in accuracy enabled an estimation of the octupole-coupling constant C. 相似文献
4.
S. Kröger 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2007,41(1):55-59
Laser spectroscopy with either optogalvanic or laser
induced fluorescence detection have been employed to measure the
hyperfine structure of 25 transitions of atomic niobium in the
visible and near infrared spectral range. The magnetic dipole
hyperfine interaction constants A of 43 energy levels (22 of
even and 21 of odd parity) were determined, 30 of which have been
investigated for the first time. The values obtained for the even
parity levels are compared with the results of a parametric
analysis. 相似文献
5.
D. Messnarz G.H. Guthöhrlein 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2000,12(2):269-282
The hyperfine structure of about 200 lines of the neutral tantalum atom was investigated by means of Doppler limited laser
spectroscopy. From the spectra we have deduced the magnetic hyperfine interaction constants A and the electric quadrupole interaction constants B of 8 levels with even parity and 81 levels with odd parity. Further, we have discovered 24 new levels of even parity and
11 new levels of odd parity. 相似文献
6.
V. Pfeufer 《Zeitschrift für Physik A Hadrons and Nuclei》1985,321(1):83-84
High resolution laser-atomic-beam spectroscopy has been applied to study the hyperfine structure of transitions starting from metastable states of the configuration 4f125d6s2 of Tm I. Precise values for the hyperfine constants of 8 levels belonging to the configuration 4f125d6s2 and 9 levels belonging to excited odd levels have been determined. 相似文献
7.
EPR spectra of the Er3+, Nd3+, and Ce3+ ions substituting for the Y3+ ion in the YAlO3 yttrium orthoaluminate lattice are studied. The EPR spectra of these rare-earth ions are described by a spin Hamiltonian of rhombic symmetry with an effective spin S=1/2. The principal values of the g tensors were determined from an analysis of the angular dependences of the EPR spectra. The orientation of the local magnetic axes of paramagnetic centers relative to the YAlO3 crystallographic directions are shown to depend on the actual rare-earth species. The EPR spectra exhibit a hyperfine structure due to the 167Er, 143Nd, and 145Nd odd isotopes, which permitted unambiguous identification of these spectra. The hyperfine coupling constants for the odd erbium and neodymium isotopes are determined. 相似文献
8.
B. Arcimowicz A. Huss S. Roth N. Jaritz D. Messnarz G.H. Guthöhrlein H. Jäger L. Windholz 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2001,13(2):187-194
We report on further investigations of the hyperfine structure of spectral lines of the neutral tantalum atom. Besides determination
of the hyperfine constants A and B of 21 levels we report on the discovery of 9 up to now unknown fine structure levels for which we could determine their energy
position, parity, angular momentum and the constants A and B. For a large number of up to now unclassified lines the combinations could be identified.
Received 27 June 2000 and Received in final form 23 August 2000 相似文献
9.
W. Nörtershäuser K. Blaum K. Icker P. Müller A. Schmitt K. Wendt B. Wiche 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》1998,2(1):33-39
The isotope shift and hyperfine structure in the three - transitions in Ca II have been studied by fast ion beam collinear laser spectroscopy for all stable Ca isotopes. The metastable
3d states were populated within the surface ionization source of a mass separator with a probability of about 0.1%. After
resonant excitation to the 4p levels with diode laser light around 850 nm the uv photons from the transitions to the ground state were used for detection. Hyperfine structure parameters A and B for the odd isotope 43Ca, as evaluated from the splittings observed, agree well with theoretical predictions from relativistic many-body perturbation
theory. Field shift constants and specific mass shift constants were extracted from the measured isotope shifts and are discussed in comparison with expectation values from theory.
Received: 19 September 1997 / Revised: 5 December 1997 / Accepted: 27 January 1998 相似文献
10.
Yu.P. Gangrsky V.D. Karaivanov B.N. Markov S.G. Zemlyanoi Tz.T. Kokalova K.P. Marinova E. Stachowska J. Dembczynski J. Ruczkowski B. Arcimowicz 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2000,11(3):341-345
The laser-induced resonance fluorescence in an atomic beam was used in order to measure the hyperfine splitting of the 4f
7 6s
2
and 4f7 6s6p
levels in 151,153,155Eu isotopes. The hfs constants A and B of the unstable 155Eu were determined for the first time: MHz, MHz and MHz. With these data and after corrections for second-order hyperfine structure perturbations the nuclear moments of 155Eu were deduced: n.m. and b. In addition new and more precise values of the hfs constants of the excited state for the stable 151,153Eu were obtained. They are as follows: MHz, MHz and MHz, MHz. The hyperfine anomalies % and % were extracted from the corrected hfs constants.
Received 28 July 1999 and Received in final form 14 January 2000 相似文献
11.
S. Witte E.J. van Duijn R. Zinkstok W. Hogervorst 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2002,20(2):159-164
With the second and third harmonic of a tunable single-mode cw Ti:S laser, generated inside external enhancement cavities,
high-resolution LIF measurements on several states of Lu I in various parts of the electromagnetic spectrum are performed.
From these measurements, hyperfine structure A and B constants for both 175Lu and 176Lu as well as isotope shifts have been determined for all levels observed in the single-step excitation process. From the
measured A constants, the magnetic hyperfine structure anomaly has been derived for various states.
Received 14 January 2002 Published online 19 July 2002 相似文献
12.
The hyperfine structure constants A and B of all139La II even levels with 5d 2 and 5d6s configurations have been measured, mainly by high-resolution spectroscopy on collinear laser-ion-beams. Morover some A and B constants of odd-parity levels have been obtained. 相似文献
13.
R. J. Champeau E. Handrich H. Walther 《Zeitschrift für Physik A Hadrons and Nuclei》1973,260(5):361-365
The hyperfine splitting constants of the 4f 7 6s 6p y 8 P 7/2 level of Eul were determined using the level crossing method. These values and those for the hyperfine splittings of the other 4f 7 6s 6p levels are compared to theoretical values calculated with eigenfunctions of Smith and Collins. For the quadrupole coupling constants a better agreement between theory and experiment is obtained if different 〈r ?3〉 p -parameters are assumed for 4f(8 S) 6s 6p(3 P) and for 4f 7(8 S) 6s 6p(1 P). 相似文献
14.
K. Shamim I. Siddiqui L. Windholz 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2011,64(2-3):209-220
We present 39 odd and 15 even parity newly discovered fine structure levels of Pr I with low angular momentum: J = 1/2, 3/2 and 5/2. Spectral lines in the range 4200 Å to 7500 Å were experimentally investigated using laser induced fluorescence spectroscopy in a hollow cathode discharge lamp. The levels were discovered by analysis of the recorded hyperfine patterns of the investigated transitions. With the help of these levels, 119 spectral lines were classified directly by laser excitation and 127 lines were classified as fluorescence lines. 相似文献
15.
The 13C hyperfine constants of the H13CS and HS13C radicals are determined by microwave spectroscopy. For H13CS, the 101-000 rotational transition is measured at 38.5 GHz with a Fourier transform microwave spectrometer, and two 13C hyperfine constants are determined. They are well interpreted in terms of a relatively large HCS bonding angle (132.8°). For HS13C, the N=7-6, 9-8, and 10-9 rotational transitions are measured in the 268-384 GHz region by using a source modulation spectrometer combined with a free-space discharge cell, and five 13C hyperfine constants including the nuclear spin-rotation constant, Caa, are determined. From the 13C hyperfine constants, the p character of the unpaired electron orbital on the carbon atom is estimated to be 66.5%, supporting a classical resonance picture; . 相似文献
16.
K. A. H. van Leeuwen E. R. Eliel B. H. Post W. Hogervorst 《Zeitschrift für Physik A Hadrons and Nuclei》1981,301(2):95-99
Nine transitions in Nd I, originating from various levels belonging to the 4f 46s 2 ground state configuration, have been studied with high resolution using an actively stabilized C.W. ring dye laser in a crossed laser-atomic-beam set-up. Accurate values for the isotope shifts in all transitions as well as for the hyperfine structure constants of 7 excited states have been obtained. 相似文献
17.
P. Grundevik H. Lundberg L. Nilsson G. Olsson 《Zeitschrift für Physik A Hadrons and Nuclei》1982,306(3):195-209
High-resolution laser fluorescence spectroscopy, using a single-mode dye laser acting on a collimated atomic beam, has been performed to determine the hyperfine-structure (hfs) constants in six states of the 6p 5d configuration of135Ba and137Ba. Isotope shifts (IS) for eleven transitions between the 6s 5d and the 6p 5d configurations have also been measured. From an analysis of the energy levels, intermediate angular wavefunctions have been deduced. The wavefunctions are used to evaluate experimental hyperfine parameters from the experimental hfs constants. The parameters are, for the magnetic-dipole interaction compared with theoretical values, and for the electricquadrupole interaction used to estimate the nuclear quadrupole moments for the odd isotopes. The IS in the measured transitions are analysed using a King-plot, with the first resonance line in Ba II as the reference. Specific mass and field shifts are evaluated for the measured transitions. The field shifts have been used to determine the change in mean-square radius between the natural abundant Ba-isotopes. 相似文献
18.
The ground-state hyperfine splitting values of high-Z boronlike ions are calculated. Calculation of the interelectronic-interaction contribution is based on a combination of the 1/Z perturbation theory and the large-scale configuration-interaction Dirac-Fock-Sturm method. The screened QED corrections are evaluated utilizing an effective screening potential approach. Total hyperfine splitting energies are presented for several B-like ions of particular interest: 45Sc16+, 57Fe21+, 207Pb77+, and 209Bi78+. For lead and bismuth the experimental values of the 1s hyperfine splitting are employed to improve significantly the theoretical results by reducing the uncertainty due to the nuclear effects. 相似文献
19.
The electronic spectrum of cobalt monochloride has been investigated from 415 to 725 nm using a laser-ablation/molecular-beam laser-induced fluorescence spectrometer. Two separate electronic systems with origins near 483.3 and 470.3 nm were observed. Data have been recorded for these two transitions at both low and high resolution. These transitions are now characterized as the [20.7]3Φ4−X3Φ4 and [21.3]3Φ4−X3Φ4 transitions. A low-resolution vibrational analysis and a high-resolution rotational analysis have been carried out for each system, resulting in accurate values for the ground and excited state vibrational spacings and effective rotational constants. In addition, the magnetic hyperfine structure resulting from the spin of the Co nucleus was resolved and the hyperfine constants were determined. Comparison of the CoCl spectrum with that of CoH and CoF has allowed the ground state electron configuration of (core)(10σ)2(4π)4(1δ)3(5π)3(11σ)2 to be determined. The hyperfine constants support the electron promotion 11σ→12σ for the observed transitions. 相似文献
20.
S. Büttgenbach R. Dicke H. Gebauer M. Herschel 《Zeitschrift für Physik A Hadrons and Nuclei》1977,280(3):217-226
The atomic-beam magnetic-resonance method in combination with the triple resonance technique has been used to determine the nuclear magnetic dipole moments of99Ru and101Ru. The moments are deduced fromrf transition measurements in the5F5 and5F4 states at magnetic fields between 770 and 2400 Oe. In order to reduce the part of the uncertainty of the moments which arises from the uncertainty of the hyperfine structure constants more precise values of the constants than those available up to now were determined from low field measurements. After making corrections for hyperfine and Zeeman interactions with neighbouring atomic states we obtain the following values for the magnetic dipole moments:μ 99=?0.6381 (51)μ N andμ 101=?0.7152 (60)μ N (uncorrected for diamagnetic shielding). The results of the present work combined with the results of an earlier hyperfine structure investigation in the5F multiplet are analysed with respect to the effective-operator formalism. From this analysis we obtain the following values for the electric quadrupole moments:Q 99=0.076 (7) b andQ 101=0.44 (4) b (uncorrected for Sternheimer shielding or antishielding). 相似文献