Bindiya Arora

Blackbody-radiation shift in a 88Sr+ ion optical frequency standard

The blackbody-radiation (BBR) shift of the 5s–4d5/2 clock transition in 88Sr+ is calculated to be 0.250(9) Hz at room temperature, T = 300 K, using the relativistic all-order method where all single and double excitations of the Dirac–Fock wavefunction are included to all orders of perturbation theory. The BBR shift is a major component in the uncertainty budget of the optical frequency standard based on the 88Sr+ trapped ion. The scalar polarizabilities of the 5s and 4d5/2 levels, as well as the tensor polarizability of the 4d5/2 level, are presented together with the evaluation of their uncertainties. The lifetimes of the 4d3/2, 4d5/2, 5p1/2 and 5p3/2 states are calculated and compared with experimental values.

Frequency-dependent polarizabilities of alkali-metal atoms from ultraviolet through infrared spectral regions

We present results of first-principles calculations of the frequency-dependent polarizabilities of all alkali-metal atoms for light in the wavelength range 300-1600 nm, with particular attention to wavelengths of common infrared lasers. We parametrize our results so that they can be extended accurately to arbitrary wavelengths above 800 nm. This work is motivated by recent experiments involving simultaneous optical trapping of two different alkali-metal species. Our data can be used to predict the oscillation frequencies of optically trapped atoms, and particularly the ratios of frequencies of different species held in the same trap. We identify wavelengths at which two different alkali-metal atoms have the same oscillation frequency.

Emending thermal dispersion interactions of Li, Na, K, and Rb alkali-metal atoms with graphene in the Dirac model

Using accurate dynamic polarizabilities of Li, Na, K and, Rb atoms, we scrutinize the thermal Casimir-Polder interactions of these atoms with a single layered graphene. Considering the modified Lifshitz theory for material interactions, we reanalyze the dispersion coefficients (

Testicular granulosa cell tumor, adult type.

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Blackbody-radiation shift in aCa+43ion optical frequency standard

s) of the above atoms with graphene as functions of separation distance, gap parameter and temperature among which some of them were earlier studied by estimating dynamic polarizabilities of the above atoms from the single oscillator model approximation. All these

Multipolar blackbody radiation shifts for single-ion clocks

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State-insensitive bichromatic optical trapping

coefficients have been evaluated in the framework of the Dirac model. The interactions are described for a wide range of distances and temperatures to demonstrate the changes in behavior with the varying conditions of the system and also sensitivities in the interactions are analyzed by calculating them for different values of the gap parameter. From these analyses, we find a suitable value of the gap parameter for which the true nature of the interactions in graphene can be surmised more accurately.

Black-body radiation shifts and theoretical contributions to atomic clock research

Granulosa cell tumor (GCT) of the adult type is a rare and slow-growing neoplasm in the testis. This tumor may be associated with endocrine manifestations and resemble classic GCT of the ovary morphologically. It has a potential for distant metastasis or recurrence late in the clinical course. We report a case of granulose cell tumor of the testis, adult type.

Determination of magic wavelengths for the 7 s S 1 / 2 2 − 7 p P 3 / 2 , 1 / 2 2 transitions in Fr

Motivated by the prospect of an optical frequency standard based on 43Ca+, we calculate the blackbody radiation (BBR) shift of the 4s_1/2-3d_5/2 clock transition, which is a major component of the uncertainty budget. The calculations are based on the relativistic all-order single-double method where all single and double excitations of the Dirac-Fock wave function are included to all orders of perturbation theory. Additional calculations are conducted for the dominant contributions in order to evaluate some omitted high-order corrections and estimate the uncertainties of the final results. The BBR shift obtained for this transition is 0.38(1) Hz. The tensor polarizability of the 3d_5/2 level is also calculated and its uncertainty is evaluated as well. Our results are compared with other calculations.

van der Waals coefficients for alkali-metal atoms in material media

Appraising the projected