Prospects for optical clocks with a blue-detuned lattice.

We investigated the properties of optical lattice clocks operated with a repulsive light-shift potential. The magic wavelength, where light-shift perturbation for the clock transition cancels, was experimentally determined to be 389.889(9) nm for 87Sr.

Frequency shifts in an optical lattice clock due to magnetic-dipole and electric-quadrupole transitions.

We report a hitherto undiscovered frequency shift for forbidden J = 0-->J = 0 clock transitions excited in atoms confined to an optical lattice. These shifts result from magnetic-dipole and electric-quadrupole transitions, which have a spatial dependence in an optical lattice that differs from that of the stronger electric-dipole transitions. In combination with the residual translational motion of atoms in an optical lattice, this spatial mismatch leads to a frequency shift via differential energy level spacing in the lattice wells for ground state and excited state atoms.

Trapping of neutral mercury atoms and prospects for optical lattice clocks.

We report vapor-cell magneto-optical trapping of Hg isotopes on the (1)S(0)-(3)P(1) intercombination transition. Six abundant isotopes, including four bosons and two fermions, were trapped. Hg is the heaviest nonradioactive atom trapped so far, which enables sensitive atomic searches for "new physics" beyond the standard model.

Optical lattice polarization effects on hyperpolarizability of atomic clock transitions.

The light-induced frequency shift due to hyperpolarizability (i.e., terms of second-order in intensity) is studied for a forbidden optical transition, J = 0 --> J = 0.

Ultrastable optical clock with neutral atoms in an engineered light shift trap.

An ultrastable optical clock based on neutral atoms trapped in an optical lattice is proposed. Complete control over the light shift is achieved by employing the 5s(2) 1S0-->5s5p 3P0 transition of 87Sr atoms as a "clock transition." Calculations of ac multipole polarizabilities and dipole hyperpolarizabilities for the clock transition indicate that the contribution of the higher-order light shifts can be reduced to less than 1 mHz, allowing for a projected accuracy of better than 10(-17).

[Gastric and small intestine motility in patients with duodenal ulcer and sleep disorders].

Fasting motility of the stomach and small intestine and that after carbohydrate, protein and fat meals were studied with tubes furnished with tensometers over 24-50 hours in 7 healthy and 31 duodenal ulcer males. Over the first night 7 healthy and 17 ulcer subjects were subjected to polygraphic sleep registration including electroencephalogram. Sleep quality was assessed by means of biorhythmologic questionnaire.

[Lipid peroxidation and its interrelation with the personality characteristics of surgical patients].

The article deals with the exam results of 42 pre- and postoperative surgical patients. The reactivity of peroxide oxidation of lipids plays an important role in regulation of adaptive process of surgical patients. The authors emphasize the role of anxiety state as one of the most intimate and obligate mechanisms of psychologic stress.