We report an experiment in which an atomic excitation is localized to a spatial width that is a factor of 8 smaller than the wavelength of the incident light. The experiment utilizes the sensitivity of the dark state of electromagnetically induced transparency (EIT) to the intensity of the coupling laser beam. A standing-wave coupling laser with a sinusoidally varying intensity yields tightly c...

Measurement of total and trimethyl lead in mammalian tissue is described, using ion exchange/high performance liquid chromatography in tandem with flameless atomic absorption spectrometry for lead-specific detection. All lead forms in whole blood and homogenates of soft tissue--brain, kidney, and liver--were liberated from tissue binding by treatment with dilute (3N) HCl for a period of 18 hr. ...

We report the observation of polarization anisotropy in the optical suppression of photoassociative ionization (PAI) collisions. Binary collisions occur within a tightly collimated and optically cooled velocity group of a single sodium beam. A laser beam, blue-detuned with respect to the atomic resonance transition, crosses the atomic beam and suppresses the PAI rate. We measure this suppressio...

The Stark shift due to blackbody radiation (BBR) is the key factor limiting the performance of many atomic frequency standards, with the BBR environment inside the clock apparatus being difficult to characterize at a high level of precision. Here we demonstrate an in-vacuum radiation shield that furnishes a uniform, well-characterized BBR environment for the atoms in an ytterbium optical lattic...

We consider a homogeneous tree endowed with nondoubling flow measure $\mu$ of exponential growth and probabilistic Laplacian $\mathcal{L}$ self-adjoint respect to $\mu$. prove that the maximal characterization in terms heat Poisson semigroup Riesz transform atomic Hardy space introduced previous work fail.

Let { f i ( x ) = s ? + t } be a self-similar IFS on R and let ? > 1 Pisot number. We prove that if log ? | ? Q for some then every C diffeomorphism g non-atomic measure ? , the g? is supported numbers are normal in base .

The mechanical properties of materials depend strongly on crystal structure and defect configuration. Here we measure the strength of suspended single-crystal and bicrystal graphene membranes prepared by chemical vapour deposition. Membranes of interest are first characterized by transmission electron microscopy and subsequently tested using atomic force microscopy. Single-crystal membranes pre...

We describe the performance characteristics and frequency measurements of two high-accuracy high-stability lasercooled atomic frequency standards. One is a 657-nm (456-THz) reference using magneto-optically trapped Ca atoms, and the other is a 282-nm (1064-THz) reference based on a single Hg ion confined in an RF-Paul trap. A femtosecond mode-locked laser combined with a nonlinear microstructur...

Laser atomic magnetometry is a portable and low-cost yet highly sensitive method for low magnetic field detection. In this work, the atomic magnetometer was used in a remote-detection geometry to measure the relaxivity of aqueous gadolinium-diethylenetriamine pentaacetic acid Gd(DTPA) at the Earth's magnetic field (40 μT). The measured relaxivity of 9.7±2.0 s(-1) mM(-1) is consistent with field...

Atomic nuclei are the essence of the visible universe. Formed in the big bang or in cataclysmic astrophysical explosions, atomic nuclei are a crucial and intriguing part of the world. The basic features of atomic nuclei were understood in terms of the nuclear shell model in the 1963 Nobel Prize winning research of Eugene Paul Wigner, Maria Goeppert-Mayer, and J. Hans de Jensen. Since then, exte...