On the hyperfine structure and isotope shift of radium

Wendt, Κ.; Ahmad, S. A.; Klempt, W.; Neugart, R.; Otten, Ernst W.; Stroke, H. H.

doi:10.1007/bf01436633

Cited by 76 publications

(86 citation statements)

References 36 publications

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“…The different Lorentzian line-widths are due to saturation effects related to various relaxation rates [34], here introduced by the buffer gas. The measured HFS splitting 4542(7) MHz for the 7 2 P 1/2 state is within two standard deviations of the value 4525(5) MHz obtained at ISOLDE [25]. For the 6 2 D 3/2 state the HFS splitting was measured as 1,055(10) MHz; the extracted This work 4,542(7) 528(5) ISOLDE [25] 4,525(5) -Theory [4] 4,555 543 Theory [18] 4,565 541…”

Section: Hyperfine Structuresupporting

confidence: 81%

“…Fig. 3) was only available from measurements at the ISOLDE facility at CERN, where the isotope shift (IS) and hyperfine structure (HFS) of the 7 2 S 1/2 , 7 2 P 1/2 , and 7 2 P 3/2 states were obtained by collinear spectroscopy over a large range of isotopes [25,26]. The only absolute measurement of the relevant wavelengths dates back to arc emission spectroscopy performed on 226 Ra + in 1933 [27].…”

Section: Experimental Statusmentioning

confidence: 99%

“…701 (50) 248 (50) 453 (34) The measured values for the 6 2 D 3/2 state and a value extracted from [25,26] for the 7 2 P 3/2 HFS were used to obtain the IS with respect to the center-of-mass of the resonances in 213 Ra + equation model. We use the 6 2 D 3/2 F = 2 − 7 2 P 3/2 F = 1 resonance to determine the IS.…”

Section: Isotope Shift Of Thementioning

confidence: 99%

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Atomic parity violation in a single trapped radium ion

et al. 2011

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Atomic parity violation (APV) experiments are sensitive probes of the electroweak interaction at low energy. These experiments are competitive with and complementary to high-energy collider experiments. The APV signal is strongly enhanced in heavy atoms and it is measurable by exciting suppressed (M1, E2) transitions. The status of APV experiments and theory are reviewed as well as the prospects of an APV experiment using one single trapped Ra + ion. The predicted enhancement factor of the APV effect in Ra + is about 50 times larger than in Cs atoms. However, certain spectroscopic information on Ra + needed to constrain the required atomic many-body theory, was lacking. Using the AGOR cyclotron and the TRIμP facility at KVI in Groningen, short-lived 212−214 Ra + ions were produced and trapped. First ever excited-state laser spectroscopy was performed on the trapped ions. These measurements provide a benchmark for the atomic theory required to extract the electroweak mixing angle to sub-1% accuracy and are an important step towards an APV experiment in a single trapped Ra + ion.

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Section: Hyperfine Structuresupporting

confidence: 81%

Section: Experimental Statusmentioning

confidence: 99%

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Atomic parity violation in a single trapped radium ion

et al. 2011

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“…1). Many isotopes of Ra are available from radioactive sources such as 229 Th [10-13], or at online isotope production facilities such as ISOLDE, CERN, Switzerland [14,15].A sensitive search for EDMs requires efficient collection of the atoms in an optical trap because of the low abundance of Ra isotopes. A strategy for efficient laser cooling and trapping has been developed with the chemical homologue barium (Ba).…”

mentioning

confidence: 99%

“…This identified Ra as an alkaline earth metal. Hyperfine splittings and isotope shifts were determined for the 7s 2 1 S 0 -7s7p 1,3 P 1 transitions by collinear laser spectroscopy [14,15] with intense Ra ion beams at ISOLDE, lifetimes of low lying states were determined in ANL, USA [9,19]; no absolute frequencies are quoted.Here we report on a laser spectroscopy measurement of the frequency of the strong 7s 2 1 S 0 -7s7p …”

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confidence: 99%

Absolute frequency measurement of the7s2 1S0–7s

et al. 2014

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Transition frequencies were determined for transitions in Ra in an atomic beam and for reference lines in Te2 molecules in a vapor cell. The absolute frequencies were calibrated against a GPS stabilized Rb-clock by means of an optical frequency comb. The 7s 2 1 S0(F = 1/2)-7s7p 1 P1(F = 3/2) transition in 225 Ra was determined to be 621 042 124(2) MHz. The measurements provide input for designing efficient and robust laser cooling of Ra atoms in preparation of a search for a permanent electric dipole moment in Ra isotopes. PACS numbers: 31.30.jp, 11.30.Er, 42.62.Fi, Radium (Ra) is the heaviest alkaline earth metal and it offers unique possibilities for measuring parity and time reversal symmetry violation. The particular atomic and nuclear [1][2][3][4][5][6][7][8] structure in Ra isotopes cause the largest enhancement for permanent electric dipole moments (EDMs) [9] in any atom. This arises from the close proximity of the 7s7p 3 P 1 and 7s6d3 D 2 states [1]. The exploitation of the enhancement from this 5 cm −1 separation requires precise knowledge of Ra atomic properties such as the absolute frequencies of transitions that are relevant for laser cooling and state manipulation (see Fig. 1). Many isotopes of Ra are available from radioactive sources such as 229 Th [10-13], or at online isotope production facilities such as ISOLDE, CERN, Switzerland [14,15].A sensitive search for EDMs requires efficient collection of the atoms in an optical trap because of the low abundance of Ra isotopes. A strategy for efficient laser cooling and trapping has been developed with the chemical homologue barium (Ba). Exploiting the strong 6s 2 1 S 0 -6s6p 1 P 1 transition [16,17] resulted in an efficiency of ∼1% for slowing and capturing Ba from an atomic beam, whereas capture efficiencies of below 10 −6 were reported for Ra when using the weak intercombination transition 7sThe optical spectrum of Ra was first studied by Rasmussen [18]. This identified Ra as an alkaline earth metal. Hyperfine splittings and isotope shifts were determined for the 7s 2 1 S 0 -7s7p 1,3 P 1 transitions by collinear laser spectroscopy [14,15] with intense Ra ion beams at ISOLDE, lifetimes of low lying states were determined in ANL, USA [9,19]; no absolute frequencies are quoted.Here we report on a laser spectroscopy measurement of the frequency of the strong 7s 2 1 S 0 -7s7p

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88-Ra Radium

Fricke

Heilig

Nuclear Charge Radii

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On the hyperfine structure and isotope shift of radium

Cited by 76 publications

References 36 publications

Atomic parity violation in a single trapped radium ion

Atomic parity violation in a single trapped radium ion

Absolute frequency measurement of the7s2 1S0–7s

88-Ra Radium

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