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1.
The wavelengths of the3S(3s 4s) ?3P(3s 3p) MgI transitions have been measured for the24Mg isotope with a precision of ±2 × 10?7; moreover the isotope shifts of the above transitions have been measured for the three natural Mg isotopes as well as the hyperfine constants of the3S(3s 4s) level of25Mg. The measurements have been performed in a metastable atomic beam. 相似文献
2.
S. Bouazza Y. Guern R. Abjean J. Bauche 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1987,7(1):33-36
The magnetic hyperfine structure factorA of the quasi-totality of the levels of the low 4p 3 and 4p 25s configurations of As I has been measured by Fabry-Perot interferometry in the far UV range. A good agreement is observed between experimental results and theoretical evaluations, which allows us to confirm that the 4p 25s configuration only mixes very weakly (less than 1%) with 4s4p 4. 相似文献
3.
Systematic transition calculations have been performed for all triplet decay channels from 2s2p 23s 3 P of N II. The lifetime of 0.505 ns compares favourably with experiment. Transitions in absorption from the 2s 22p 2 3 P ground state have also been determined along with a number of other triplet transitions. Length and velocity forms of thef-value are in agreement at the 2–3% level for most transitions. 相似文献
4.
We report a re-examination of the fine structure analysis of the levels of the 5s5p 3 configuration of Sn I taking into account the perturbing effects of twenty-two configurations of the type 5s 25pmd and 5s 25pns and utilizing recent experimental data. New identifications of levels of 5s5p 3 are proposed and reasons for their assignment are presented. 相似文献
5.
M. Gallardo M. Raineri J. G. Reyna Almandos 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1994,30(4):261-264
The spectrum of four times ionized Xenon (XeV), has been observed in the 500–6800 Å range and 84 new lines have been identified as transitions between levels of 5s5p 3, 5s 25p5d, 5s 25p6s, 5s 25p 2, and 5s 25p6p configurations. Nine new levels belonging to the configuration 5p6p have been determined. The results of this analysis are supported by Hartree-Fock calculations. The configurations are interpreted by fitting the theoretical energy parameters to the observed levels using least-squares techniques. 相似文献
6.
A. Wague 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1988,8(3):251-254
Near the (3s3p)1 P resonance of He, we have calculated the photoelectrons angular distribution asymmetry parameter β2p in the diagonalization approximation. Using the measured value of β n=2 near the (3s3p)1 P level obtained by Lindle et al. in the resonance photo-ionization of He to He?(n=2), we have estimated the ratioR=σ2p /σ2s of the partial 2p photo-ionization cross section to the partial 2s photo-ionization cross section. Our calculation supports the result that in the resonance region, the formation of ions in the 2p level dominates over the 2s level. This is in good agreement with the experimental and most of the theoretical results reported to date. 相似文献
7.
Chen-Zhong Dong Jin-Bao Zhao 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1992,23(3):211-213
Some terms of the 4s4p 4 configuration in RuXII, RhXIII and PdXIV ions can be improved and all the energy values of the configuration in AgXV can be predicted theoretically by means of a configuration-interaction ab initio analysis for the level structure of the 4s4p 4 configuration along the AsI sequence of KrIV-AgXV ions. Calculations of the wavelengths and oscillator strenghts are presented for the 4s 24p 3-4s4p 4 transition in AgXV. 相似文献
8.
P. L. Larkins P. Hannaford 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1993,27(4):313-320
Absolute frequencies of hyperfine components of the 230.6 nm (5s 2 1 S 0?5s5p 3 P 1 0 ), 193.6 nm (5s5p 3 P 0 0 ?5s6s 3 S 1), 197.7 nm (5s5p 3 P 1 0 ?5s6s 3 S 1) and 207.9 nm (5s5p 3 P 2 0 ?5s6s 3 S 1) transitions in In II emitted from a hollow-cathode source have been measured using a high-resolution, scanning échelle monochromator. The measured frequencies of these four transitions have been used to determine the energies and hyperfine interaction constants of the 5s5p 3 P 0 0 ,3 P 1 0 ,3 P 2 0 and 5s6s 3 S 1 levels in In II. The hyperfine interaction constants for the dominant isotope115In are found to be: 5s5p 3 P 1 0 A=0.2322(2) cm?1,B=?0.0159(9) cm?1 5s5p 3 P 2 0 A=0.1699(4) cm?1,B= 0.021 (6) cm?1 5s6s 3 S 1 A=0.4022(4) cm?1,B= 0.002 (2) cm?1. The absolute frequency of the very narrow, strongly forbidden In II 236.5 nm (5s 2 1 S 0?5s5p 3 P 0 0 ) transition, which has been proposed as a candidate for a new optical frequency standard, is found to be 42275.986(7) cm?1. 相似文献
9.
T. Brodzinski H. -D. Kronfeldt J. -R. Kropp R. Winkler 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1987,7(2):161-164
Nine transitions (ranging from 475 till 733 nm) between the excited configuration 3d 5 4s 5s and 3d 5 4s 4p of55Mn were investigated with computer supported interference spectroscopy. Thus the hyperfine structure (hfs) of the four 4s 5s and the twelve 4s 4p levels is now completely known from experiment. The hfs results are discussed with the effective operator technique and for 4s 4p the accuracy of the one-electron parametersa ik could be improved:a 3d 10 =?6.28(24),a 4s 10 =154.0(1.4),a 4p 01 =9.3(8),a 4p 12 =7.7(2.5) in mK. For the configuration 4s 5s — for which fine structure calculations are not yet available — the experimental hfs data prove a practically pureS-character. Besides the one-electron splitting parameters deduced:a 3d 10 =?6.5(5),a 4s 10 =182(3),a 5s 10 =24(3) in mK, permit to determine the degree of mixing between the twoe 6 S 5/2 andf 6 S 5/2 levels which amounts to about 3%. 相似文献
10.
W. E. van der Veer R. J. J. van Diest A. Dönszelmann 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1993,25(3):201-203
The radiative lifetimes of the levels in the 3d 94s(1 D)4p configuration of Cu I are measured. The levels are excited from the metastable 3d 94s 2 2 D 3/2,5/2 levels. The metastable Cu atoms are generated in a pulsed hollow cathode discharge. The levels investigated are populated with a 35-ps laser pulse at wavelengths around 220 nm. The laser induced fluorescence signal is detected. The lifetime of the 3d 94s(3 D)4p 4 D 1/2 level is also determined by direct excitation from the ground state. A comparison with calculated literature values is given. 相似文献
11.
G. Yuan Y. Kato H. Daido R. Kodama K. Murai S. Nakai 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1994,32(1):1-5
Classification of 3-3 transitions in neonlike germanium in laser-produced plasma has been made. The spectra have been observed in the range of 185–290 Å using a high resolving power (λ/Δλ ~ 13000) grazing-incidence spectrometer in XUV laser experiment. A total of 21 lines (including five lasing lines) have been classified as transitions between the 2s 22p 53s, 3p, 3d or 2s2p 63p, 3d and sodiumlike germanium configurations. The identified transitions have been used to derive energy levels of 2s 22p 53l in neonlike germanium. The experimental results have been compared with theoretical predictions from Dirac-Fock (MCDF) calculations. 相似文献
12.
J. Landais M. Huet H. Kucal G. Rieger G. Grall T. Dohnalik 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1996,38(1):13-17
The properties of the autoionizing 3p 511s’ [1/2]1 Argon I level have been experimentally studied in the presence of a strong magnetic field (2.14-2.22 T). Quasi- Landau type oscillations have been observed in the width and position of the 3p 5-4p[1/2]0 -3p 511s’ [1/2]1 exciting transition. The results provide an additional support for earlier observations of Lemoigne et al. [7]. No evidence for similar oscillations in magnetic field dependence of the Fano q parameter was observed. 相似文献
13.
Using the non-closed shell many-electron theory for excited states of Sinano?lu we compute the hyperfine structure constants of Be I 1s22s2p 3P0, B I 1s22s2p24P and B I 1s22s2p22D. The quadrupole moment of 9Be is also newly determined to be, Q = 0.05494 barns. 相似文献
14.
S. Bouazza J. Bauche J. Dembczynski E. Stachowska 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1987,7(2):185-188
The magnetic hyperfine structures of some levels of the 4p 2 4d configuration which mixes strongly with the 4s 4p 4 configuration, have been measured for the first time, using the Fabry-Perot technique in the far UV range. A good agreement is observed between experimental results and theoretical evaluations. 相似文献
15.
E. Stachowska J. Dembczyński B. Arcimowicz A. Kajoch 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1987,7(2):177-183
The hyperfine structure splittings of the lines: 318.6980 nm, 328.2567 nm, 330.6264 nm, 332.7443 nm, 339.1810 nm, 340.9208 nm, 549.0347 nm, 589.8241 nm, 610.3918 nm were measured and the hyperfine structures of the levels belonging to the configuration 6s6p 3 in Bi II were determined. The influence on the hyperfine structure of the electrostatic configuration interaction between 6s6p 3 and 6s 26pn'd configurations was discussed. 相似文献
16.
B. Möbus K. -H. Schartner A. Ehresmann H. Schmoranzer 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1994,30(4):285-290
Double photoionization of argon was studied by photon induced fluorescence spectroscopy (PIFS). Cross sections for the double photoionization into the 3s3p 5 1 P,3 P states of Ar++ are presented for exciting photon energies between threshold and 120 eV. In the threshold range the energy dependencies of these cross sections were determined for the first time. Singlet and triplet states are populated with comparable probabilities at equal excess energies, in contrast to predictions of the extended Wannier theory. Athv=100 eV the spin-or-bit splitting of the 3s3p 5 3 P state was resolved, and a cross section for the production of Ar++ 3s 03p 6 1 S 0 was determined for the first time. 相似文献
17.
H. Bergström G. W. Faris H. Hallstadius H. Lundberg A. Persson 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1989,13(1):29-31
Lifetimes for the3 S 1,3 P 0, 1, 2 and3 D 1, 2, 3 states in the 3s 23p5p configuration of silicon have been determined using stepwise dye laser excitation and time resolved detection. A comparison is made with theoretical values, calculated using multi-configuration Hartree-Fock wavefunctions. Laser-evaporation was used to produce free silicon atoms by focusing a Nd: YAG laser on a rotating silicon target. 相似文献
18.
H. Kaupp H. -P. Didra C. Kramer M. Baumann 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1993,27(4):307-312
Depolarization of excited114Cd 5s5p 3 P 1 atoms induced by collisions with various molecular gases (N2, H2, D2, CO, CO2, CH4, C2H6, C2H4) has been investigated using polarized fluorescence spectroscopy. After pulsed optical excitation of the Cd 53 P 1 level with appropriately polarized light the temporal behaviour of Zeeman quantum beats has been observed showing the influence of collisional destruction of orientation and alignment. By analyzing the signal curves at different molecular gas pressures the corresponding depolarization cross sections for114Cd atoms in the 53 P 1 state have been obtained. With regard to a test of a nuclear spin decoupling model for the collisions the cross sections were compared with previously measured hyperfine structure transfer cross sections of113Cd 5s5p 3 P 1 atoms. 相似文献
19.
E. H. Pinnington W. Ansbacher E. Träbert P. H. Heckmann H. M. Hellmann G. Möller 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1987,6(3):241-247
The beam-foil spectrum obtained using a beam of Ti3+ ions of energy 10 MeV has been studied over the wavelength range from 14 nm to 80 nm. New assignments are suggested for 18 levels belonging to the levels of the 3p 3, 3s 3p 3d and 3s 2 4p configurations. The lifetimes of these levels, as determined from conventional multi-exponential curve fitting of their intensity decay curves, are typically about 30% longer than is forecast by theory. The same decay curves have also been used to represent the effect of cascade repopulation on the decay curves obtained for the resonance doublet levels of the 3s 3p 2 and 3s 2 3d configurations. A discussion is given of the possible techniques for cascade correction in beam-foil lifetime measurements, and of the inclusion of a window function to represent the vignetting effect close to the foil. Lifetimes obtained using these techniques for the 3s 2 3d levels (38±6 ps for J=3/2, 36±5 ps for J=5/2), and the 3s3p 2 2 S level (99±6 ps),2 P levels (60±15 ps for J=1/2, 50±15 ps for J=3/2) and2 D levels (820±30 ps for j=3/2, 870±40 ps for J=5/2) are in good agreement with theoretical predictions. 相似文献
20.
J. Kwela 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1994,32(1):35-40
The intensity of the 531.5 nm electric-field-quench radiation has been measured on a thermal beam of neutral Pb atoms in the metastable 6p 2 1 S 0 state. The measurement yields a Stark-mixing amplitude for transition between the 6p 2 1 S 0 and 6p 2 3 P 2 states. Combining this result with available experimental data sets an upper limit for the 6p 7s 3 P 1 → 6p 2 1 S 0 transition probability:A ki <1.79·103 s ?1. Calculations for the 6p 7s → 6p 2 and 6p 8s → 6p 2, as well as transition rates of forbidden lines inside 6p 2 configuration of PbI are presented and compared with existing experimental data. 相似文献