Neutral calcium, strontium and barium: determination of f values of the principal series by the hook method

Parkinson, W. H.; Reeves, E. M.; Tomkins, F. S.

doi:10.1088/0022-3700/9/2/006

Cited by 128 publications

(53 citation statements)

References 32 publications

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“…However, typically the literature gives the total transition rate A T from a given excited state to the fine structure manifold states below. So we need establish the relation [25], b [26], c [27], d [28], e [29], f [30], g [31]. [33].…”

Section: Theoretical Descriptionmentioning

confidence: 99%

“…After calculating magic wavelengths for Sr and Ca optical clock transitions and comparing them to the experimental values, we calculate the polarizability of terahertz transition with data collection mainly from Ref. [20,[25][26][27][28][29][30][31][32].…”

Section: Theoretical Descriptionmentioning

confidence: 99%

“…Then, we calculate the crossing points for terahertz clock transitions where the difference of polarizability is zero. [26,28,31], then we use updated theoretical data in Ref. [27,30], and for the rest we mainly use theoretical values in Ref.…”

Section: A Strontiummentioning

confidence: 99%

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Magic wavelengths for terahertz clock transitions

Zhou

Chen

et al. 2010

Phys. Rev. A

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Magic wavelengths for laser trapping of boson isotopes of alkaline-earth Sr, Ca and Mg atoms are investigated while considering terahertz clock transitions between the 3 P 0 , 3 P 1 , 3 P 2 metastable triplet states. Our calculation shows that magic wavelengths of trapping laser do exist. This result is important because those metastable states have already been used to realize accurate clocks in the terahertz frequency domain. Detailed discussions for magic wavelength for terahertz clock transitions are given in this paper.

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Section: Theoretical Descriptionmentioning

confidence: 99%

Section: Theoretical Descriptionmentioning

confidence: 99%

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Magic wavelengths for terahertz clock transitions

Zhou

Chen

et al. 2010

Phys. Rev. A

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“…Despite the lifetimes of the lowest nsnp [3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24], persistent discrepancies remain. Only very recently, Zinner et al [3] have achieved 0.4% accuracy for the rate of 4s4p S 0 transition in calcium.…”

Section: Introductionmentioning

confidence: 99%

Many-body calculations of electric-dipole amplitudes for transitions between low-lying levels of Mg, Ca, and Sr

et al. 2001

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To support efforts on cooling and trapping of alkaline-earth atoms and designs of atomic clocks, we performed ab initio relativistic many-body calculations of electric-dipole transition amplitudes between low-lying states of Mg, Ca, and Sr. In particular, we report amplitudes, and for 3 P o 2 → 1 D 2 transitions. For Ca, the reduced matrix element 4s4p 1 P o 1 ||D||4s 2 1 S 0 is in a good agreement with a high-precision experimental value deduced from photoassociation spectroscopy [Zinner et al., Phys. Rev. Lett. 85, 2292 ]. An estimated uncertainty of the calculated lifetime of the 3s3p 1 P o 1 state of Mg is a factor of three smaller than that of the most accurate experiment. Calculated binding energies reproduce experimental values within 0.1-0.2%.

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“…Table II presents comparisons of the OSs for a single-photon absorption we have calculated with other theoretical [7,9] and the experimental data [23,[28][29][30][31] for L = S, P, D, and F in both length and velocity gauges for the following single-photon transitions: 4s 2 1 S e → 4s(4 − In this subsection we investigate two-photon ionization of Ca by the second harmonic of the Ti:sapphire laser at the photon energy ω = 3.1 eV, which is schematically shown in Fig. 2.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Multiphoton ionization of the calcium atom by linearly and circularly polarized laser fields

Buică

Nakajima

2010

Phys. Rev. A

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We theoretically study multiphoton ionization of the Ca atom irradiated by the second (photon energy 3.1 eV) and third (photon energy 4.65 eV) harmonics of Ti:sapphire laser pulses (photon energy 1.55 eV). Because of the dense energy level structure the second and third harmonics of a Ti:sapphire laser are nearly single-photon resonant with the 4s4p 1 P o and 4s5p 1 P o states, respectively. Although two-photon ionization takes place through the near-resonant intermediate states with the same symmetry in both cases, it turns out that there are significant differences between them. The photoelectron energy spectra exhibit the absence/presence of substructures.More interestingly, the photoelectron angular distributions clearly show that the main contribution to the ionization processes by the third harmonic arises from the far off-resonant 4s4p 1 P o state rather than the near-resonant 4s5p 1 P o state. These findings can be attributed to the fact that the dipole moment for the 4s 2 1 S e -4s5p 1 P o transition is much smaller than that for the 4s 2 1 S e -4s4p 1 P o transition.

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Neutral calcium, strontium and barium: determination of f values of the principal series by the hook method

Cited by 128 publications

References 32 publications

Magic wavelengths for terahertz clock transitions

Magic wavelengths for terahertz clock transitions

Many-body calculations of electric-dipole amplitudes for transitions between low-lying levels of Mg, Ca, and Sr

Multiphoton ionization of the calcium atom by linearly and circularly polarized laser fields

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