共查询到20条相似文献,搜索用时 15 毫秒
1.
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
2.
B.K. Ankush A. Venugopalan S.A. Ahmad 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》1999,7(2):139-149
Isotope shifts (-) are reported for 221 spectral lines of the neutral dysprosium atom (Dy I) in the region 470-565 nm using a photoelectric
recording Fabry-Perot spectrometer and highly enriched isotopic samples of and excited in liquid-nitrogen-cooled hollow-cathode lamps. Isotope shift data for 173 of these lines are being reported for
the first time. Using the isotope shift data, term isotope shifts (-) have been evaluated for 99 even- and 68 odd-parity energy levels of Dy I. New values have been obtained for 24 odd and 36 even levels. These new values have enabled us to check some of the existing tentative assignments and also to suggest configuration assignments
to a few unassigned energy levels. The earlier tentative assignments of 4
f10
5
d
6
p configuration to many high odd levels lying above have been presently confirmed. We could assign the 4f95d6s6p configuration to 24 unassigned even levels.
Received: 3 August 1998 相似文献
3.
A. Bouzed S. Kröger D. Zimmermann H.-D. Kronfeldt G. Guthöhrlein 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2003,23(1):57-62
We report on hyperfine structure measurements in 21 lines of atomic niobium in the spectral region from 640 nm to 870 nm by
means of optogalvanic laser spectroscopy and laser induced fluorescence spectroscopy using a hollow cathode discharge and
a tunable single-mode cw ring laser. Hyperfine structure constants A and B of altogether 29 excited energy levels were determined, 18 of them for the first time.
Received 18 July 2002 / Received in final form 8 November 2002 Published online 4 February 2003
RID="a"
ID="a"e-mail: sk@kalium.physik.tu-berlin.de 相似文献
4.
E. J. van Duijn S. Witte R. Zinkstok W. Hogervorst 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2002,19(1):25-29
The 4
d
10
1
S0 ground-state transitions to the 4
d
9
5
p configuration of palladium (Pd) have been studied. For this purpose, a tunable, single-mode, deep-UV cw laser has been built
to generate the sum frequency of a frequency-doubled Ti:S laser with a second Ti:S laser. The produced wavelengths range from
244 to 276 nm. From the measured spectra the frequency splitting due to hyperfine structure and isotope shift, the hyperfine structure
A and B constants and the lifetimes of the states have been extracted.
Received 3 October 2001 相似文献
5.
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
6.
M. Oba K. Akaoka M. Miyabe I. Wakaida 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2000,10(3):349-352
We measured Zeeman effect of atomic uranium spectra using laser induced fluorescence spectroscopy, and derived the J-value and g-factor of the second step levels. J-values and g-factors of high lying odd levels could be obtained. These data, especially the g-factors, have almost been unknown so far. We could verify our method which can be useful to measure J-values and g-factors of high lying levels of complex atoms like uranium.
Received 27 July 1999 and Received in final form 30 November 1999 相似文献
7.
S. Bouazza H.O. Behrens M. Fienhold J. Dembczynski G.H. Guthöhrlein 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》1999,6(3):311-317
The hyperfine structure of selected odd-parity levels of the configurations 5d6s
26p and 5d
26s6p of I was studied in 10 lines lying in the red spectral region. Hyperfine spectra were obtained by the method of laser induced
fluorescence in the plasma of a liquid nitrogen cooled hollow cathode discharge. The observed hyperfine structure constants
A and B, together with results from earlier studies were analyzed by means of a parametric method. The interpretation has been carried
out based on a refined multiconfigurational fine structure calculation including the main Rydberg series configurations mutually
interacting. The set of fine structure parameters as well as the leading eigenvector percentages of levels relevant for this
paper are given. The following single electron hfs parameters were deduced for : , ,, for the lowest configuration.
Received: 16 November 1998 / Received in final form: 5 February 1999 相似文献
8.
S. Guérandel T. Badr M.D. Plimmer P. Juncar M.E. Himbert 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2000,10(1):33-38
The frequency of the centroid of the transition in Ag I has been determined by laser spectroscopy of a collimated metastable thermal atomic beam. We find MHz. The isotope shift MHz. For the magnetic hyperfine structure constant of the state, assuming IJ coupling, we find, MHz and MHz.
Received 16 July 1999 and Received in final form 7 October 1999 相似文献
9.
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
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.
D. Ashkenasi S. Kröger H.-D. Kronfeldt 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2000,11(2):197-205
The isotope shift (IS) and hyperfine structure (hfs) of nine levels (31720 to 38921 cm-1) assigned to the configuration 4
f
12
6
s
7
s in neutral erbium have been determined experimentally using Doppler-reduced saturation absorption spectroscopy in a gas discharge.
We performed a fine structure analysis in the SL-coupling scheme of the single configuration 4
f
12
6
s
7
s, confirming and extending the classification of even parity Er I levels. We discriminated the different hfs contributions
of the 4f12 core and the (6
s
+7
s) outer electrons of the shell in a non-relativistic JJ-coupling approach and in the relativistic effective tensor operator formalism in SL-coupling. The relativistic one-electron parameters of the hfs for 167Er were fitted to the experimental data by a least squares fit procedure: [0pt] a
01
4f
=-147(3) MHz, [0pt] a
10
6s
+
a
10
7s
=-1840(30) MHz, [0pt] b
02
4f
=6560(80) MHz. The level dependencies of the isotope shift were evaluated based on crossed second order (CSO) effects. We obtained
the following results for the CSO parameters for the isotope pairs 170-168Er: d
6s7s
=-740(30) MHz, z
4f
= 0(5) MHz, (
g
3,6s
(
f
, 6
s
)+
g
3, 7s
(
f
, 7
s
))= -24(15) MHz and for 170-166Er: d
6s7s
=-1500(50) MHz, z
4f
=0(10) MHz, (
g
3,6s
(
f
,6
s
)+
g
3,7s
(
f
+7
s
))=-50(29) MHz. The resulting parameters for the hfs are compared with those known for other configurations of the Er atom and ion.
Received 16 May 1999 and Received in final form 31 January 2000 相似文献
12.
A.V. Volotka V.M. Shabaev G. Plunien G. Soff 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2003,23(1):51-56
The finite nuclear size effect on the hyperfine splitting of low-Z hydrogen-like atoms is studied in the external field approximation. A simple non-relativistic formula is proposed which expresses
the nuclear size correction to the hyperfine splitting in terms of moments of the nuclear charge and magnetization distribution.
The numerical results obtained via this formula are compared with corresponding results derived by means of the Zemach formula. A relativistic formula for the
nuclear size correction to the hyperfine splitting is also derived.
Received 18 March 2002 / Received in final form 14 November 2002 Published online 28 January 2003
RID="a"
ID="a"e-mail: plunien@physik.tu-dresden.de 相似文献
13.
S. Bouazza J. Dembczynski E. Stachowska G. Szawiola J. Ruczkowski 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》1998,4(1):39-46
On the basis of most of the earlier hyperfine-structure (hfs) experimental results, the hfs of the atomic zirconium has been
reanalyzed by the simultaneous parameterization of the one- and two-body interactions for the model space (4
d
+ 5
s
)
4
. The values of the one- and two-body hfs parameters have been determined and the nuclear quadrupole moment, free of Sternheimer
corrections up to second order, has been evaluated. Moreover, the values of the magnetic-dipole A and the electric-quadrupole B constants for all known levels of this model space have been predicted.
Received: 22 December 1997 / Revised: 15 May 1998 / Accepted: 1 July 1998 相似文献
14.
T. J. Wasowicz 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2009,53(3):263-272
Isotope shifts in the 623.7 nm line of Pb I have been measured. Then, in a spectral range of nm the optical isotope shifts in 24 lines of neutral and singly ionized lead have been analyzed using a combined model-independent
method. From the combination of the optical isotope shifts data with elastic electron scattering, muonic X-ray and electronic
Kα X-ray data, we were able to determine the two contributions to the total isotope shift, namely the mass and the
field shifts, and to obtain the values of several nuclear factors for a long chain of lead isotopes. 相似文献
15.
F. Le Blanc L. Cabaret J.E. Crawford S. Essabaa V. Fedoseyev W. Geithner J. Genevey M. Girod R. Horn G. Huber S. Kappertz J. Lassen J.K.P. Lee G. Le Scornet V. Mishin R. Neugart J. Obert J. Oms A. Ouchrif S. Peru J. Pinard H. Ravn B. Roussière J. Sauvage D. Verney 《The European Physical Journal A - Hadrons and Nuclei》2002,15(1-2):49-51
Laser spectroscopy measurements have been carried out on the very neutron-rich tin isotopes with the COMPLIS experimental
setup. Using the 5s
25p
23
P
0 → 5s
25p6s
3
P
1 optical transition, hyperfine spectra of 126-132Sn and 125m, 127m, 129m-131mSn where recorded for the first time. The variation of the mean-square charge radius ( δ〈r
2〉) between these nuclei and nuclear moments of the isomers and the odd isotopes were thus measured. An odd-even staggering
which inverts at A = 130 is clearly observed. This indicates a small appearance of a plateau on the δ〈r
2〉 which has to be confirmed by measuring the isotope shift beyond A = 132.
Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002
RID="a"
ID="a"e-mail: leblanc@ipno.in2p3.fr 相似文献
16.
J. Walls R. Ashby J.J. Clarke B. Lu W.A. van Wijngaarden 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2003,22(2):159-162
The lithium D lines were studied using a diode laser that was frequency modulated by an electro-optic modulator, to excite an atomic beam.
The transmission of part of the laser beam through an etalon was monitored to correct for the nonlinearity of the laser scan.
The results for the 6,7Li 2 S
1/2 and 2 P
1/2 hyperfine splittings agree very well with the best existing data while those for the D1 isotope shift and 6,7Li fine structure splittings disagree significantly from data obtained by a previous laser atomic beam experiment. Our result
for the D1 isotope shift is very close to the latest value computed using Hylleraas variational theory.
Received 8 April 2002 / Received in final form 26 June 2002 Published online 21 January 2003
RID="a"
ID="a"e-mail: wvw@yorku.ca 相似文献
17.
Y.P. Gangrsky D.V. Karaivanov K.P. Marinova B.N. Markov L.M. Melnikova G.V. Mishinsky S.G. Zemlyanoi V.I. Zhemenik 《The European Physical Journal A - Hadrons and Nuclei》1998,3(4):313-318
The hyperfine structure of the D2 optical line in 22Na and 23Na has been investigated using high resolution laser spectroscopy of a well-collimated atomic beam. The hyperfine splitting
constants A and B for the excited 3p 2P3/2 level for both investigated sodium isotopes have been obtained. They are as follows: A(22) = 7.31(4) MHz, B(22) = 4.71(28)
MHz, A(23) = 18.572(24) MHz, B(23) = 2.723(55) MHz. With this data, using the high precision MCHF calculations for the electric
field gradient at the nucleus, the electric quadrupole moment of 22Na has been deduced: Qs(22) =+0.185(11) b. The sign of Qs(22), determined for the first time, indicates a prolate nuclear deformation. A precise value of the isotope shift 22,23Na in the D2 line has also been obtained.
Received: 26 February 1998 / Revised version: 25 June 1998 相似文献
18.
Z.-C. Yan 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2002,18(1):15-18
The fully correlated calculations of the Zeeman gJ factors for the first three quartet S states of lithium are presented, including relativistic and radiative corrections of
orders α2, α2
m/M, and α3. The isotope shifts in gJ are predicted precisely for various isotopes of lithium.
Received 4 December 2000 and Received in final form 26 September 2001 相似文献
19.
A new method for extracting the hyperfine anomaly from experimental hyperfine structure constants is suggested. Instead of
independent high-precision measurements of the nuclear magnetic dipole moment, precise measurements of magnetic dipole hyperfine
interaction constants for two atomic states and a theoretical analysis can be used. This can lead to determination of hyperfine
anomaly for radioactive isotopes where the nuclear magnetic dipole moment is not known with high accuracy.
Received: 17 February 1998 相似文献
20.
R. M. Jennerich A. N. Keiser D. A. Tate 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,40(1):81-89
We have obtained Doppler-free spectra of transitions in the
→ 2p2(3P)
and
→
multiplets of atomic nitrogen using saturated absorption spectroscopy. These multiplets consist of
respectively of seven and eight transitions, and have center of gravity wavelengths of 821 nm and 869 nm. Values for the hyperfine
structure coupling constants of all the upper and lower states for these multiplets were obtained for both 14N and 15N. Isotope shifts of three transitions in each multiplet were also measured, and a significant J-dependence to the shifts
was observed. 相似文献