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1.
A high resolution laser-induced fluorescence study has been performed on thirteen ground-state transitions in samarium, using
a frequency-doubled Ti:sapphire laser in the wavelength range 350–440 nm. From each spectrum isotope shifts and hyperfine
structure constants A and B are derived. The results are used to determine the nuclear parameter λAA'. 相似文献
2.
STUDIES ON HYPERFINE STRUCTURE AND ISOTOPE SHIFT OF SOME EXCITED STATES IN Yb AND Tm ATOMS 下载免费PDF全文
The hyperfine structures and isotope shifts in some excited states of Yb and Tm have been measured using laser-atomic beam interaction, stepwise excitation and fluorescence detection techniques. From the experimental results, magnetic dipole hyperfine constants A and electric quadrupole hyperfine constants B have been derived. So for as we know, the A factor of [4f125d6s6p]9/2 level in Tm is given for the first time. 相似文献
3.
V. Sonnenschein I. D. Moore S. Raeder A. Hakimi A. Popov K. Wendt 《The European Physical Journal A - Hadrons and Nuclei》2012,48(4):52
An overview of preparatory work aiming at the identification of the low-lying 7.6 eV isomer in 229Th through a measurement of its hyperfine structure is presented. A 233U recoil gas cell has been developed and has undergone several iterations in order to improve the efficiency of extracting
a low-energy beam of 229Th+ ions. Spectroscopic studies on stable 232Th have been carried out to establish an efficient laser ionization scheme. The latter will be applied in connection with
the gas cell in order to improve the extraction efficiency by accessing the neutral atomic fraction. In addition to that of
the 229Th ground state, the hyperfine structure of the isomer can then be determined either by collinear laser spectroscopy on the
extracted and accelerated ions or by direct in-source/in-jet high-resolution Resonance Ionization Spectroscopy (RIS). The
first experiments using high-resolution RIS have been performed and isotope shifts of 228Th, 229Th and 230Th relative to 232Th were measured on an atomic 7s
2 → 7s7p ground-state transition at 380.42 nm. A template of the ground-state hyperfine structure of 229Th has been established for a 261.24 nm UV transition. This is an important step towards identification of the isomeric state. 相似文献
4.
Y. Gangrsky K. Marinova S. Zemlyanoi M. Avgoulea J. Billowes P. Campbell B. Cheal B. Tordoff M. Bissell D. H. Forest M. Gardner G. Tungate J. Huikari H. Penttilä J. Äystö 《Hyperfine Interactions》2006,171(1-3):209-215
Collinear laser spectroscopy experiments on the ScII transition 3d4s
3D2→3d4p
3F3 at λ ≈ 363.1 nm were performed on the 42–46Sc isotopic chain using an ion guide isotope separator with a cooler–buncher. Isotope and isomer shifts and hyperfine structures
of five ground states and two isomers were measured. Preliminary results on the nuclear moments and charge radii changes deduced
from these measurements are reported. 相似文献
5.
G. D. Alkhazov A. E. Barzakh V. P. Denisov V. S. Ivanov I. Y. Chubukov V. N. Fedoseev V. S. Letokhov V. I. Mishin S. K. Sekatsky 《Hyperfine Interactions》1990,61(1-4):1335-1338
New results on spins, electromagnetic moments and isotopic changes of nuclear charge radii for
63
157–159
Eu,
64
146, 148, 150
Cd and
65
147–155, 157, 159
Tb have been obtained from hyperfine structure and isotope shifte measured with laser resonance photoionization technique.
These results complement two-dimensional picture (with respect to H and Z) of the changes of nuclear ground state properties
near the “critical” neutron numbers N=88–90 in the vicinity of the “magric” proten number Z=64. 相似文献
6.
The Doppler-free two-photon absorption method performed with a narrowbandc w dye laser permitted high resolution measurements of transitions from the Ba I ground state 6s 2 1 S 0 to several highly excited states. The lifetimes and hyperfine splittings of these states as well as the isotope shifts of the transitions have been determined accurately. The lifetime values are in agreement with transition probability data; the hyperfine splitting results show considerable configuration interaction effects. A detailed discussion of the isotope shifts is given. 相似文献
7.
L. Giuffrida L. Torrisi M. Rosinski F. Caridi M. Cutroneo 《Applied Physics A: Materials Science & Processing》2012,107(2):469-475
A Nd:YAg laser, operating in fundamental wavelength at 1064 nm, is focused at an intensity of the order of 1010 W/cm2 to ablate a solid Ge target. A Laser Ion Source (LIS) system is employed to produce ion emission at high directionality,
high current, high rate of production and high charge states. 相似文献
8.
A. Anatassov Yu. P. Gangrsky K. P. Marinova B. N. Markov B. K. Kul'djanov S. G. Zemlyanoi 《Hyperfine Interactions》1992,74(1-4):31-40
The present work reports measurements of isotope shifts and hyperfine structure in the optical spectra of two high-Z elements:
Hf and U. The experiments are based on the observation of the resonance fluorescence in a well collimated atomic beam, excited
by a tunable dye laser. The chains of the stable Hf isotopes and of233–236, 238U have been investigated and changes in ms nuclear charge radii have been deduced. The results have been discussed from the
point of view of nuclear structure in the investigated regions. 相似文献
9.
J. Sauvage N. Boos L. Cabaret J.E. Crawford H.T. Duong J. Genevey M. Girod G. Huber F. Ibrahim M. Krieg F. Le Blanc J.K.P. Lee J. Libert D. Lunney J. Obert J. Oms S. Péru J. Pinard J.C. Putaux B. Roussière V. Sebastian D. Verney S. Zemlyanoi J. Arianer N. Barré M. Ducourtieux D. Forkel-Wirth G. Le Scornet J. Lettry C. Richard-Serre C. Véron 《Hyperfine Interactions》2000,129(1-4):303-317
Laser spectroscopy measurements have been carried out on very neutron-deficient isotopes of Au, Pt and Ir, produced as daughter
elements from a Hg ISOLDE beam. For these transitional region nuclides, the hyperfine structure (HFS) and isotope shift (IS)
were measured by Resonance Ionization Spectroscopy (RIS). Magnetic moments μ, spectroscopic quadrupole moments Qs and changes of the nuclear mean square charge radius δ〈rc
2〉along isotopic series have been extracted. For some results, a detailed comparison with theoretical predictions is presented.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
10.
Systematic studies of the optical isotope shift and the hyperfine splitting of long chains of stable and radioactive isotopes
were performed. The method applied was laser induced resonance absorption; the experimental techniques were the atomic beam
method with fluorescence detection and the optogalvanic method. The theory of hyperfine splitting and isotope shift of atoms
is reviewed in short with emphasis on the aspects interesting for nuclear physics and on the evaluation problem. The experimental
methods are described and their key parameters sensitivity and resolution are discussed. Preliminary results on stored thorium
ions are given. Sample results for the nuclear quantity δ<r
2> derived from atomic beam experiments with tin and strontium are presented. 相似文献
11.
Absolute frequency and isotope shift measurements of the cooling transition in singly ionized indium
Y. H. Wang R. Dumke J. Zhang T. Liu A. Stejskal Y. N. Zhao Z. H. Lu L. J. Wang Th. Becker H. Walther 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2007,44(2):307-311
We report greater than two orders of magnitude improvements in the absolute frequency and isotope shift measurements of the
In+ 5s2
1S0 (F = 9/2)–5s5p 3P1 (F = 11/2) transition near 230.6 nm. The laser-induced fluorescence from a single In+ in a radio-frequency trap is detected. The fourth-harmonic of a semiconductor laser is used as the light source. The absolute
frequency is measured with the help of a frequency comb referenced to a Cs atomic clock. The resulting transition frequencies
for isotopes 115In+ and 113In+ are measured to be 1 299 648 954.54(10) MHz and 1 299 649 585.36(16) MHz, respectively. The deduced cooling transition frequency
difference is 630.82(19) MHz. By taking into account of the hyperfine interaction, the isotope shift is calculated to be 695.76(1.68) MHz. 相似文献
12.
T. J. Wąsowicz R. Drozdowski J. Kwela 《The European physical journal. Special topics》2007,144(1):185-189
Studies of the hyperfine structure and isotope shifts
in 733.2 nm mixed (M1+E2) multipole line of Pb I are presented. As
a light source the electrodeless discharge tube was used. The high
resolution spectral apparatus consisted of a silver coated
Fabry-Perot etalon and a grating spectrograph combined with a CCD
camera used as a detector. In the analysis of the spectra a
computer simulation technique was used. The experiments with the
isotope 207Pb yielded the hyperfine structure splitting
constant A for the 3P1 and 1D2 levels of the
6s26p2 ground configuration. In the experiment with natural
lead the isotope shifts between four stable isotopes (204, 206,
207, 208) were measured. 相似文献
13.
Z. B. Wang B. C. Gou F. Chen 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,37(3):345-349
The relativistic energies, the oscillator strength, and
the lifetimes of high-lying core-excited states 1s2s2pnp 5P (n=2–5) and
1s2p2mp 5So (m=2–5) of Li- ion are calculated with the
saddle-point variational method and restricted variation method. The fine
structure and the hyperfine structure of the core-excited states for this
system are also explored. The results are compared with other theoretical
and experimental data in the literature. 相似文献
14.
Muon hyperfine constants A_μ have been measured by transverse field μSR for (CH3)3Si\mbox\.CHMu in hexane from 167 K to 332 K. In addition, avoided level‐crossing resonance was used to determine \alpha‐proton
coupling constants Ap over a similar range of temperatures. The two hyperfine constants can be described by a common temperature dependence, d|Ai|/ dT=1.4\times 10-3 MHz\,K-1, where Ai represents Ap or the reduced muon constant A^\prime_μ=0.3141A_μ. There is a small isotope effect (A^\prime_μ is 2.2 % larger than Ap) consistent with zero‐point motion in the anharmonic C–H bond stretch. The common temperature dependence is tentatively attributed
to a coupled deviation of the C–H and C–Mu bonds out of the nodal plane of the p orbital containing the unpaired electron.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
15.
31P nuclear magnetic resonance (NMR) shifts on the order of thousands of parts per million are observed for olivine LiMPO4 (M = Mn, Fe, Co, Ni) samples, a promising class of Li ion rechargeable battery electrode materials. Variable-temperature
31P NMR measurements of shift are used to determine that the supertransferred hyperfine interaction is the dominant mechanism
giving rise to these unusually large observed 31P shifts. Various models for predicting 31P and 7Li shifts in LiMPO4 (M = Mn, Fe, Co, Ni) were investigated. Alloys of LiFe1−x
Mn
x
PO4, where x varies from 0 to 1, were also investigated by 7Li NMR. Covalency constants, calculated from variable-temperature NMR shifts and magnetic susceptibility data, are determined
for the P–O–M bonds in LiMPO4 (M = Mn, Fe, Co, Ni) and compared to the covalency constants of the Li–O–M bond. The sign and relative magnitude of the covalency
constants are discussed in terms of positive and negative spin densities at the nuclei of interest. The covalency constants
for the Li–O–M and P–O–M bonds were measured for Li1.8Na0.2FeMn2(PO4)3 and compared to the covalency constants measured in the olivine LiMPO4 (M = Mn, Fe, Co, Ni) samples. The Li1.8Na0.2FeMn2(PO4)3 structure has a volume per transition metal atom and Li–O–M bond distances that are similar to those of the olivine LiMPO4 (M = Mn, Fe, Co, Ni) samples.
Authors' address: Jeffrey A. Reimer, Department of Chemical Engineering, University of California Berkeley, Berkeley, CA 94720,
USA 相似文献
16.
W. Zhang S. You C. Sun Y. Zhang J. Xu Z. Ma Y. Feng H. Liu P. Quinet é. Biémont Z. Dai 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2009,53(1):1-8
First laser spectroscopic measurements of the 6s5d3D1-6s6p1P1 and 6s5d3D2-6s6p1P1 transitions in several isotopes of atomic barium have been performed. The hyperfine structure of these transitions was optically
resolved and isotope shifts for even and odd isotopes were determined. The isotope shifts show a deviation from their expected
behavior for odd isotopes in an analysis based on King-plots. This observation puts atomic structure calculations at test
because available theories do not predict this. A profound understanding of the wavefunctions for heavy alkaline earth systems
like barium (Ba) and radium (Ra) is essential for a theoretical evaluation of their sensitivity to fundamental symmetry breaking
effects such as they could be observed, e.g., through permanent electric dipole moments. Further the absolute frequency of
the 6s2
1S0-6s6p3P1 intercombination line in 138Ba was determined to be 12 636.6232(1) cm-1. 相似文献
17.
Isotope shifts and hyperfine splittings in tungsten I have been measured by Doppler-free saturated absorption and polarisation spectroscopy on two UV transitions at 294.44 nm and 294.70 nm. The splittings between the even isotopes (182W, 184W, 186W) and the splitting between the two strong hyperfine components of 183W were measured in a natural isotopic mixture of tungsten introduced into a hollow cathode discharge. In addition, using single isotope 183W, the level hyperfine splittings were measured by resolving crossover peaks between the strong and weak hyperfine components. These measured level splittings are compared with those predicted from centre of gravity considerations. 相似文献
18.
G. D. Sprouse J. Das T. Lauritsen J. Schecker A. Berger J. Billowes C. H. Holbrow W. Kim F. Xu 《Hyperfine Interactions》1990,59(1-4):91-95
Isotope shifts have been measured for the neutron deficient even Yb isotopes up to the neutron shell closure at N=82. The
isotope shifts were measured using the 556-nm atomic resonance transition from the1
S
0 ground state to the3
P
1 level. The heavier isotopes of Yb have been investigated by Buchinger et al./1/. The change in (r
2) observed for Yb isotopes with N=82–90 has considerably different behavior than for the lighter rare earths. 相似文献
19.
M. Oinonen U. Köster J. Äystö V. Fedoseyev V. Mishin J. Huikari A. Jokinen A. Nieminen K. Peräjärvi A. Knipper G. Walter 《The European Physical Journal A - Hadrons and Nuclei》2001,10(2):123-127
Beta-decay of 59Mn has been studied at PSB-ISOLDE, CERN. The intense and pure Mn beam was produced using the Resonance Ionization Laser Ion
Source (RILIS). Based on the measured β-decay rates the ground-state spin and parity are proposed to be J
π = 5/2-. This result is consistent with the systematic trend of the odd-A Mn nuclei and extends the systematics one step further towards the neutron drip line.
Received: 17 November 2000 / Accepted: 16 February 2001 相似文献
20.
K. J. Öberg 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2007,41(1):25-47
Transition isotope shifts of 3s–3p transitions in Ne II and Ne III are measured in Fourier transform spectra from a hollow-cathode
source. Accurate absolute line-center positions of the 20Ne isotope are derived for the purpose of tertiary wavelength standards in the region 2000–5000 ?. A robust statistical treatment
is applied, yielding line-position uncertainties that are lower than for the Ar II secondary standards used as references.
The influence of Stark shifts on both the new Ne II standards and the Ar II standards is also investigated. In addition, improved
wavenumbers of the 3p–3d and 3p–4s transitions are presented, of which 12 in Ne II have been measured for the first time.
Electronic supplementary material Supplementary Online Material 相似文献