Measurements of absolute transition probabilities in Ba ii through optical nutation

Kastberg, Anders; Villemoes, P.; Arnesen, A.; Langereis, A.; Jungner, Peter; Linnæus, Staffan

doi:10.1364/josab.10.001330

Cited by 27 publications

(23 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The transition probability A 3←5 however, measured to be higher as compared to ref. 6, while the result of our measurement are within the uncertainties of other previous measurements12.…”

Section: Resultssupporting

confidence: 87%

“…Subsequent improvements resulted in an overall precision of about 10%. Kastberg et al 12. developed a method of measuring the branching fraction from an optical nutation experiment which provided marginal improvement over the existing results, however this method is limited by systematic constraints such as optical nutation which depends on magnetic field, laser intensity at the ion position etc .…”

mentioning

confidence: 99%

See 1 more Smart Citation

An exacting transition probability measurement - a direct test of atomic many-body theories

Dutta

Munshi

Yum

et al. 2016

Sci Rep

View full text Add to dashboard Cite

A new protocol for measuring the branching fraction of hydrogenic atoms with only statistically limited uncertainty is proposed and demonstrated for the decay of the P3/2 level of the barium ion, with precision below 0.5%. Heavy hydrogenic atoms like the barium ion are test beds for fundamental physics such as atomic parity violation and they also hold the key to understanding nucleo-synthesis in stars. To draw definitive conclusion about possible physics beyond the standard model by measuring atomic parity violation in the barium ion it is necessary to measure the dipole transition probabilities of low-lying excited states with a precision better than 1%. Furthermore, enhancing our understanding of the barium puzzle in barium stars requires branching fraction data for proper modelling of nucleo-synthesis. Our measurements are the first to provide a direct test of quantum many-body calculations on the barium ion with a precision below one percent and more importantly with no known systematic uncertainties. The unique measurement protocol proposed here can be easily extended to any decay with more than two channels and hence paves the way for measuring the branching fractions of other hydrogenic atoms with no significant systematic uncertainties.

show abstract

“…The transition probability A 3←5 however, measured to be higher as compared to ref. 6, while the result of our measurement are within the uncertainties of other previous measurements12.…”

Section: Resultssupporting

confidence: 87%

mentioning

confidence: 99%

An exacting transition probability measurement - a direct test of atomic many-body theories

Dutta

Munshi

Yum

et al. 2016

Sci Rep

View full text Add to dashboard Cite

show abstract

“…As discussed in Ref. [2], the reported intervals, in particular the highest (n,L) δE [3] NEW δE [3] TOT δE [4] NEW δE [4] TOT ( (7,9) −0.01 −0.17 −0.00 0.01 (20,9) −0.01 −0.12 −0.00 0.01 L splittings, are influenced by differential Stark shifts that were not considered in Ref. [3].…”

Section: Quantitymentioning

confidence: 99%

“…The Rydberg ion beam then passed through a cw CO 2 laser whose fixed frequency was chosen to be close to that required to excite the ions from a populated level into a highly excited level. For this study, typical transitions were (n,n ) = (19,52) and (20,52). Any ions excited to the upper level were Stark ionized, and the resulting Ba 2+ ions were collected and counted.…”

Section: Spectroscopy Of Rydberg Levels Of Ba +mentioning

confidence: 99%

Dipole transition strengths in Ba+from Rydberg fine-structure measurements in Ba and Ba+

et al. 2010

View full text Add to dashboard Cite

The fine structure of high-L n = 19 and 20 Rydberg states of Ba + has been measured precisely using the resonant excitation Stark ionization spectroscopy technique, allowing for a determination of the Ba 2+ polarizability: α D (Ba 2+ ) = 10.75(10) a.u. This result, in combination with an improved model of the K splittings in Ba Rydberg levels, allows for a more precise determination of the Ba + dipole transition strengths connecting the 6 2 S 1/2 ground state to the 6 2 P 1/2 and 6 2 P 3/2 excited states. The results, in atomic units, are 6 2 S 1/2 ||D|| 6 2 P 1/2 = 3.3251(21) and 6 2 S 1/2 ||D|| 6 2 P 3/2 = 4.7017(27).

show abstract

“…The branching fractions and transition probabilities of a fast decaying excited state can be measured by different techniques such as ultrafast excitations [3], optical nutation [19], or by simple photon counting at different wavelengths. The first approach requires complicated laser pulse sequence and suffers from systematics due to synchronization; the second one is prone to systematics due to the measurement of the actual intensity at the ion position; and the last technique is limited by the availability of well calibrated detectors.…”

mentioning

confidence: 99%

Precision measurement of branching fractions ofBa138+: Testing many-body theories below the 1% level

et al. 2015

View full text Add to dashboard Cite

The branching fractions from the excited state 6P[/2 of singly charged barium ion has been measured with a precision 0.03% in an ion trap experiment. This measurement along with the known value of the upper state lifetime allowed the determination of the dipole matrix elements for the transitions P-S and P-D to below the 1% level. Therefore, it is now possible to compare the many-body calculations of these matrix elements at a level which is of significance to any parity-nonconservation experiment on barium ion. Moreover, these dipole matrix elements are the most significant contributors to the parity-violating matrix element between the S-D transition, contributing up to 90% to the total. Our results on the dipole matrix elements are 3.305 ± 0.014 a.u. and 3.042 ± 0.016 a.u. for the S-P and P-D transitions, respectively. Trapping and laser cooling of ions provide a perturbationfree environment to measure atomic state lifetime [1], light shift [2], branching ratio [3], and other fundamental properties of atoms with high precision [4], This leads to the use of trapped and laser cooled ions for quantum state manipulation [5,6], atomic clocks [7] and to study fundamental interac tions [8], The study of fundamental interactions via atomic properties include measurements of the Lamb shift [9], the parity-nonconservation (PNC) in atomic system [10], the conserved vector current hypothesis [ 11 ], the electron-electric dipole moment (e-EDM) [12], etc. As most of the original experiments have been carried out with atomic beams, they suffered from large systematic uncertainties due to limited control over the environment. These systematics are largely absent for stored atomic systems, and in addition, they provide long observation time. Therefore, in recent years, trapped and laser cooled ions have emerged as potential candidates to per form high precision experiments of fundamental importance like atomic parity violation [13,14] and e-EDM [8], Barium ion is particularly suitable for the investigation of PNC as was pointed out by Fortson [13] because of its large nuclear charge and ease of laser cooling and trapping.The best atomic PNC measurement performed so far is that of cesium with a precision of 0.3% [10]. However, the nuclear anapole moment obtained from this measurement shows a discrepancy with other nuclear data strongly suggesting the need to measure atomic PNC in other species in order to verify or to go beyond the standard model of particle physics. In this context, a number of experimental groups are pursuing an ion-trap-based atomic PNC experiment which has been proposed to be capable of limiting systematic uncertainty to below the 1% level. In addition to the experiment, one also needs the theoretical value of the parity-violating dipole matrix element with a similar precision. In principle, different variants ol the coupled cluster theory [15][16][17][18] are capable of providing such precision, provided the many-body wave functions are accurately known. Precision measurement of atomic properties of the lo...

show abstract

Measurements of absolute transition probabilities in Ba ii through optical nutation

Cited by 27 publications

References 14 publications

An exacting transition probability measurement - a direct test of atomic many-body theories

An exacting transition probability measurement - a direct test of atomic many-body theories

Dipole transition strengths in Ba+from Rydberg fine-structure measurements in Ba and Ba+

Precision measurement of branching fractions ofBa138+: Testing many-body theories below the 1% level

Contact Info

Product

Resources

About