Light-induced drift of barium atoms

Hradečný, Ç.; Slovak, J.; Těthal, T.; Yermolayev, I.M.; Podivilov, E. V.

doi:10.1103/physreva.51.3374

Cited by 5 publications

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“…In the cases of high resolution laser spectrometers the line width is 10 to 20 times smaller than D#. Thus, the The effect has already been demonstrated on the example of the radioactive isotopes 22 Na and 24 Na [13]. The isotope shift of these isotopes at the D 2 line is about 780 MHz which corresponds to Doppler shift of the resonance frequencies of atoms moving in opposite direction (D# = 800 MHz at 1 = 0-and 2 = 180-).…”

Section: Light Induced Drift Of Atoms In a Buffer Gasmentioning

confidence: 78%

“…Therefore, an appreciable increase of the sensitivity has to be expected. If the characteristics of the light induced drift are of the order of those obtained for sodium [14,15] and barium [13] isotopes, experiments with transuranium elements could be performed with -activities down to 10 s j1 and with sufficiently short half-lives (the drift time at distances of the order of 1 cm is <10 j2 s). It is well known, that such parameters have already been obtained in experimental setups which combine multi-step resonance ionization of atoms (or resonance neutralization of ions) and detection of radioactive decay.…”

Section: Light Induced Drift Of Atoms In a Buffer Gasmentioning

confidence: 99%

“…This means, that a possible depopulation of the ground state via a pumping process into a metastable level has to be avoided. A usual way to do this is the inelastic scattering on the atoms of suitably chosen buffer gas (an example is the light-induced drift of the Ba atoms in nitrogen buffer gas [13]). Thus, the first experimental steps should be the choice of the buffer gas and its pressure for most effectively quenching of the intermediate metastable states.…”

Section: Light Induced Drift Of Atoms In a Buffer Gasmentioning

confidence: 99%

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Laser Spectroscopy of Transuranium Elements

et al. 2006

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The present paper aims to discuss the prospects for nuclear structure investigation of the transuranium elements by laser spectroscopy. The authors lay stress on two peculiarities of the nuclear structure in this region: The deformed shell closure at neutron number N = 152 and the appearance of superdeformed isomeric states. A laser spectroscopic experimental method is proposed to study these features.Key Words: deformed shell closure, light-induced drift, nuclear charge radii, nuclear structure, transuranium elements. Nuclear structure peculiarities of the transuranium elementsThe region of very high-Z nuclei (Z > 92) is one of the most interesting nuclear region which remains still poorly investigated. The following characteristic features of the transuranium nuclei can be pointed out:1. Deformed shell closure with neutron number N = 152. The dependence of the energy of the -decay on the neutron number with a characteristic kink at N = 152 [1] (see Figure 1) can be interpreted as an indication of a closed shell. This behaviour is consistent with the well-known effect at other spherical shell closures, for example N = 126 (see Figure 1). In addition, nuclei with N = 152 are the most stable isotopes toward spontaneous fission. For example, as can be seen in Figure 2, the corresponding Cm, Cf and Fm isotopes have the longest spontaneous fission half-lives. 2. Shape isomers in the Z = 92-97 region: U-Bk. In the nuclei of these elements isomeric states have been observed which decay predominantly by spontaneous fission (fission isomers) [3]. These states have been interpreted as lower levels in the second potential minimum of the fission barrier ( Figure 3) [4]. The isomeric states have an unusually large quadrupole deformation (b $ 0.6) which has been deduced from measurements of the rotational level lifetimes [5] and from the nuclear charge radii of the isomeric state [6].

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Section: Light Induced Drift Of Atoms In a Buffer Gasmentioning

confidence: 78%

Section: Light Induced Drift Of Atoms In a Buffer Gasmentioning

confidence: 99%

Section: Light Induced Drift Of Atoms In a Buffer Gasmentioning

confidence: 99%

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Laser Spectroscopy of Transuranium Elements

et al. 2006

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“…9 theoretical studies. An early estimate τ e (Ba 3 D 1 ) of the order of tens of microseconds has been given by Carlsten [35], however, that author has indicated that radiative data determined in the manner described would not be very reliable [45].…”

Section: Estimate Of the Mean Radiative Lifetime Of Ba[6s5d( 3 D 1 )]mentioning

confidence: 99%

“…Kinetic measurements were described using atomic spectroscopic marker techniques and collisional rate data were reported with the noble gases He, Kr and Xe as well as with Ba( 1 S 0 ), itself. Light-induced drift measurements on Ba( 3 D J ) following initial laser excitation to Ba[6s5 p( 1 P 1 )] at λ = 553.5 nm have been carried out [9]. Whitkop and Wiesenfeld [10] have employed laser excitation to generate Ba[6 p5s( 1 P 1 )] at λ = 553.5 nm with subsequent monitoring of Ba( 3 D 1,2,3 ) by time-resolved atomic resonance absorption spectroscopy in order to characterise collisional quenching rate data for this state, particularly by Ba( 1 S 0 ), itself.…”

Section: Introductionmentioning

confidence: 99%

The Collisional Behaviour of Ba[6s5d(3DJ)] Generated Following Pulsed Dye-Laser Excitation at λ = 553.5 nm {Ba[6s6p(1P1)] ← Ba[6s2(1S0)]} in the Presence of Noble Gases and Ground State Atomic Barium by Atomic Spectroscopic Marker Emission Measurements in the Time-Domain

Adams¹,

Lei²,

Husain³

2001

Zeitschrift Für Physikalische Chemie

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We present a kinetic study of the collisional behaviour of Ba[6s5d( 3 D J )], 1.151 eV above the 6s 2 ( 1 S 0 ) ground state ( J = 1, 1.120, J = 2, 1.143, J = 3, 1.190 eV) in the time-domain. This optically metastable atom was generated following the pulsed dyelaser excitation of atomic barium vapour at elevated temperatures at λ = 553.5 nm {Ba[6s6 p( 1 P 1 )] ← Ba[6s 2 ( 1 S 0 )]}. Ba( 3 D J ) was then produced in the long-time domain following a complex series of collision and radiative processes within the energy manifold of atomic barium. The collisional behaviour of this species in the presence of neon and argon, and ground state Ba[6s 2 ( 1 S 0 )] itself, was then monitored using spectroscopic marker( 1 S 0 )]} following energy transfer by collision and energy pooling. As in previous investigations with other noble gases, first-order rate coefficients for the emission profiles at λ = 553.5 nm, 791.1 nm and 877.4 nm, which demonstrate exponential decay, were found to be in the ratio 2 : 1 : 1 in the long-time regime. These 'long times', typically 1-2 msec, may be contrasted particularly with the mean radiative lifetimes of Ba[6s6 p( 1 P 1 )] (τ e = 8.37 ± 0.38 ns) and Ba[6s6 p( 3 P 1 )] (τ e = 1.2 ± 0.1 µs). A computerised kinetic model is presented to account for these emission profiles in the 'long-time' domain. The decay coefficients resulting from these measurements are used to describe quantitatively the collisional and diffusional processes undergone by Ba( 3 D J ) with Ne and Ar, which are considered within the context of all the noble gases. Particular attention is given to the collisional removal of Ba( 3 D J ) by Ba( 1 S 0 ) where all rate measurements, which have hitherto employed a variety of vapour density data for atomic barium at elevated temperatures, are normalised to common vapour pressure data. Finally, an estimate is made of the mean radiative lifetime, τ e (Ba 3 D 1 ) = 1.5 ± 0.2 ms.

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