共查询到20条相似文献,搜索用时 15 毫秒
1.
We have measured the even isotope structure of the 6p 3P0-9s 3S1 transition in mercury at 246.5 nm using saturated absorption spectroscopy with radiation produced as the sum frequency of a 363.8 nm argon ion laser and an LD700 ring dye laser in ADP. This is the first use of cw sum-frequency mixing in nonlinear laser spectroscopy in the ultraviolet. No previous cw Doppler-free measurements have been reported at wavelenghts below 294.5 nm 相似文献
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J. Kowalski R. Neumann H. Suhr K. Winkler G. zu Putlitz 《Zeitschrift für Physik A Hadrons and Nuclei》1978,287(3-4):247-253
Doppler-free two-photon spectroscopy of several states of6, 7Li has been achieved by placing an atomic beam inside the dye laser cavity. The hyperfine structure splitting of the 4S state, the fine structure splitting of the 3D level as well as the isotope shifts of the 2S–4S and 2S-3D transition have been measured, by scanning the single-mode laser frequency and detecting the fluorescence light. In addition, signal detection by three-photon ionization via the resonant 3D state was accomplished. 相似文献
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Raman bands due to translational modes of 6Li+ and 7Li+ ions in beta-alumina were found in the frequency range of 340–410 cm?1, which is much higher than expected from the corresponding values reported for other alkali-metal ions (20–100 cm?1). Based on a model calculation, it is believed that the large shifts to higher frequencies are due to deviations of the Li+ ions from the mirror plane into “pocket sites” formed by oxygen ions above or below the Beevers-Ross sites 相似文献
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High resolution two-photon spectroscopy of the 6p
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o-7p
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o transition in stable lead isotopes
A. Timmermann 《Zeitschrift für Physik A Hadrons and Nuclei》1980,296(1):93-94
Dopplerfree two-photon speatroscopy was used to investigate isotope shifts in the 6p2 3Po — 6p7p3Po transition of the stable lead isotopes Pb 204, 206, 207, and 208. Two-photon transitions were induced by the 450,4 nm cw radiation of a frequency stabilized ring laser. 相似文献
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We show that by using laser catalysis, we can employ translationally cold (Tr approximately 1.75 K) collisions to produce ultracold (0.01 mKhomega(6Li6Li7Li)*(1(4)A')-->homega6Li6Li+7Li reaction in the collinear approximation. Ultracold 6Li6Li product molecules are shown to be produced at an extraordinary yield of up to 99.97%, using moderate laser intensities of I=100 kW/cm(2)-10 MW/cm2. 相似文献
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A.R. Rajaei-Rizi F.B. Orth J.T. Bahns W.C. Stwalley 《Journal of Molecular Spectroscopy》1985,109(1):123-133
The A1Σu+-X1Σg+ and B1Πu-X1Σg+ fluorescence of the 6Li2 and 6Li7Li molecules has been studied for all krypton ion laser lines (468.0–799.3 nm) which might be expected to excite such fluorescence. Only two A-X fluorescence series of 6Li2 were found (one excited by 647.1 nm, and one by 752.5 nm). No A-X fluorescence series of 6Li7Li was found. Five B-X fluorescence series of 6Li2 were found (one each excited by 468.0, 476.2, and 530.9 nm, and two by 568.2 nm). Four B-X fluorescence series of 6Li7Li were found (one each excited by 468.0 and 482.5 nm and two by 520.8 nm). Calculated Einstein A coefficients and lifetimes for these transitions are also given. 相似文献
7.
A two-cluster model is devised for the hypothetical 0+, T=1 level at 11.5 MeV in6Be which was proposed to explain the low value of the observed flux of high-energy solar neutrinos. It is used to show that searches for this level as carried out by means of inelastic electron scattering have not been conclusive, and could be improved to a limited degree only. 相似文献
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In this paper, the results of an experimental study on 6P3/2+6P3/2→7PJ+6S1/2 energy pooling collisions are presented. The experiment was carried out in cesium vapor using an external cavity diode laser for excitation under different temperatures. It is found that the response of fluorescence intensity to the frequency of excitation laser shows a two-peak phenomenon. 相似文献
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Petersen M Chicireanu R Dawkins ST Magalhães DV Mandache C Le Coq Y Clairon A Bize S 《Physical review letters》2008,101(18):183004
We report direct laser spectroscopy of the 1S0-3P0 transition at 265.6 nm in fermionic isotopes of neutral mercury in a magneto-optical trap. Measurements of the frequency against the LNE-SYRTE primary reference using an optical frequency comb yield 1 128 575 290 808.4+/-5.6 kHz in 199Hg and 1 128 569 561 139.6+/-5.3 kHz in 201Hg. The uncertainty, allowed by the observation of the Doppler-free recoil doublet, is 4 orders of magnitude lower than previous indirect determinations. Mercury is a promising candidate for future optical lattice clocks due to its low sensitivity to blackbody radiation. 相似文献
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Konstantin Mohr Zoran Andelkovic Aineah Wekesa Barasa Axel Buß Volker Hannen Wilfried Nörtershäuser Tim Ratajczyk Rodolfo Sánchez 《X射线光谱测定》2020,49(1):169-172
CRYRING@ESR is a newly installed low energy ring integrated in the GSI accelerator facility. In this paper we describe developments of the laser spectroscopy experiment at CRYRING@ESR. In the past commissioning beam time in November, the recently installed data acquisition system was tested. Light emitted by excited residual gas atoms was detected by a single-photon tagging technique. The time dependence of the ion beam intensity was investigated with this tool. 相似文献
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C. Karner M. Milićev R. Neumann F. Träger G. zu Putlitz 《Zeitschrift für Physik A Hadrons and Nuclei》1985,321(1):79-82
An investigation of the radiative lifetimes of several excited Eu2+ levels has been performed using a novel ion source for the production of thermal, doubly charged positive ions in a continuous gas discharge. This ionization device, first applied to the generation of Eu2+, is suitable also for other elements with similar ionization potential and vapour pressure. 相似文献
15.
D. Fink M. Behar J. Kaschny R. Klette L. T. Chadderton V. Hnatowicz J. Vacik L. Wang 《Applied Physics A: Materials Science & Processing》1996,62(4):359-367
6Li+ (150 keV) was implanted into thin polypropylene foils at fluences of 1 x 1013 to 1 x 1014 cm–2. Subsequent neutron depth profiling measurements of the Li distributions revealed considerable deviations from the expected ballistic range profiles. This Li redistribution was simulated by a numerical computer calculation. The best fit between measurements and simulations was obtained by assuming that (i) Li redistributes immediately after its ballistic slowing-down, (ii) the Li mobility is enhanced in the radiation-damaged polymer region, the local diffusion enhancement being controlled by the target's electronic damage, (iii) mobile Li is readily trapped at radiation-induced defects, their density being proportional to the target's electronic damage, (iv) these traps are saturable ones, and (v) Li migration is not restricted to the ion track region, but proceeds also through the neighboring unirradiated bulk, though with slower speed. 相似文献
16.
《Solid State Ionics》2006,177(9-10):821-826
The temperature dependence of the spin-lattice relaxation time, T1 and the line width of the 7Li nucleus were measured in delithiated LixCoO2 (x = 0.6, 0.8, 1.0). Two different relaxation behaviors were observed in the temperature dependence of T1− 1 in a x = 0.8 sample. These would have arisen from inequivalent Li sites in two coexisting phases; an original hexagonal (HEX-I) and a modified hexagonal (HEX-II) phase in the x = 0.8 sample. We analyzed using a phenomenological non Debye-type relaxation model. Motional narrowing in the line width was observed in each sample, the result revealing that Li+ ions begin to move at low temperature in samples with less Li content. It was found that the activation energy associating with Li+ ion hopping in the HEX-II phase is smaller than that in the HEX-I phase. These results show that the HEX-II phase produced in the Li deintercalation process would be suitable for Li+ ionic diffusion in multi-phase LixCoO2, and it is expected that this would enable fast ionic diffusion. Li+ ionic diffusion related to phase transition is discussed from 7Li NMR results. 相似文献
17.
用多组态Dirac-Fock(MCDF)方法,对类铝离子Cr+11、Mn+12和Fe+13能级3s23p-3s23d跃迁进行了理论计算。研究了组态相互作用对类铝离子跃迁的影响,得到了相应的跃迁能量、跃迁波长和振子强度。与已有的实验数据进行了比较,相应的计算结果符合较好。 相似文献
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Total and differential cross sections for K^ -^6Li elastic scattering are calculated using the folding optical potential model,in which the influence of three factors is considered including the recoil of target nucleus,the loosely bounded nuclear density and the unusual spin of ^6Li ground state.The theoretical results are found in pretty good accordance with the existing experimental data at PK=715 MeV/c. 相似文献
20.
Using the atomic beam magnetic resonance method and using the technique of separated oscillatory fields in combination with the triple resonance method the ratiosg I /g J of the stable alkali isotopes Li, Na and K in the2S1/2-ground state have been measured at magnetic fields of about 3 kOe. Frequency shifts analogous to the Bloch-Siegert-shift, expected from theory, were observed and eliminated by extrapolation to vanishing rf-field strength. The results, uncorrected for atomic diamagnetism, are:6Li:g I /g J =?0.22356978(10)·10?3 7Li:g I /g J =?0.59042719(10)·10?3 23Na:g I /g J =?0.40184406(40)·10?3 39K:g I /g J =?0.07088613 (6)·10?3 41K:g I /g J =?0.03890837 (4)·10?3 Furthermore, the hyperfine structure splitting constants in the2 S 1/2-ground states have been determined. Using the most precise absoluteg J -values available so far one can calculate absolute values for the uncorrectedg I - factors. The results are:Δν/MHz ?g I·103 6Li: 228.2052590(30) 0.4476540 (3)7Li: 803.5040866(10) 1.1822130 (6)23Na: 1771.6261288(10) 0.8046108 (8)39K: 461.7197202(14) 0.14193489(12)41K: 254.0138720(20) 0.07790600 (8) By comparing the absoluteg I - factors with measurements received by the NMR-method, the chemical shifts of the NMR-frequencies caused by the hydrate surrounding of the alkali ions in the NMR-probe are determined. 相似文献