A time-dependent close-coupling method is used to calculate the electron-impact ionization cross section for the outer 2p subshell of both carbon and neon atoms. The inner 1s and 2s subshells are treated using pseudopotentials, while interaction with the remaining 2p core electrons is handled in a configuration-average approximation. When the time-dependent ionization cross section for the 2p s...

We present a new determination of the metallicity gradient in M33, based on Keck LRIS measurements of oxygen abundances using the temperature-sensitive emission line [O iii] k4363 in 61 H ii regions. These data approximately triple the sample of direct oxygen abundances in M33. We find a central abundance of 12þ log (O/H) 1⁄4 8:36 0:04 and a slope of 0:027 0:012 dex kpc , in agreement with infr...

In a temperature controlled glow discharge of a mixture of neon and helium gases at 77 and 292 K, a linearly polarized laser pulse produces polarized neon atoms on the 2p5 (in Paschen notation) level (atomic alignment) from the 1s3 level. We measure the direct fluorescence from the 2p5 level to the 1s2 level with its polarization components resolved. From the temporal evolution of the intensiti...

The reflectance from the iridophores in the skin of the neon tetra Paracheirodon innesi (Myers) and the iridophores in the cornea of the sand goby Pomatoschistus minutus (Pallas) changes in response to light. In both cases the reflectance comes from the constructive interference of alternating plates of material of high and low refractive index. In the neon tetra the high refractive index plate...

Existing techniques for electron- and ion-beam lithography, routinely employed for nanoscale device fabrication and mask/mold prototyping, do not simultaneously achieve efficient (low fluence) exposure and high resolution. We report lithography using neon ions with fluence <1 ion/nm(2), ∼1000× more efficient than using 30 keV electrons, and resolution down to 7 nm half-pitch. This combination o...

35 kv. as compared to 55 kv. for the arc discharge on an ordinary day. The experiment clearly showed that corona current flow in an atmosphere of high humidity is greatly reduced, and that spark discharges at relatively low voltages are apt to occur. The explanation of this phenomenon very likely is to be found in the reduction of the mobility of negative ions in air of high humidity, although ...

It is known from ensemble measurements that rubidium atoms trapped in solid parahydrogen have favorable properties for quantum sensing of magnetic fields. To use a single atom as sensor requires technique capable efficiently measuring the internal state atom, such laser-induced fluorescence. In this work we search fluorescence ensembles and, separately, neon. find no evidence over range explore...

The separation of isotopes in space and time by gas-surface atomic diffraction is presented as a new means for isotopic enrichment. A supersonic beam of natural abundance neon is scattered from a periodic surface of methyl-terminated silicon, with the ^{20}Ne and ^{22}Ne isotopes scattering into unique diffraction channels. Under the experimental conditions presented in this Letter, a single pa...

Information-guided noise reduction (IGNoR) [Chem. Phys. Lett. 2004, 400, 446], a procedure for reducing the statistical error in Monte Carlo integration of oscillatory functions, is generalized to cases where both the prototype function and remaining integrand are complex-valued. The method is applied to the forward-backward semiclassical dynamics approximation of time correlation functions. Il...

Over the past two years at the Materials and Process Simulation Center, we have been developing simulation approaches for studying the molecular nanomachine designs pioneered by Drexler and Merkle. These nanomachine designs, such as planetary gears and neon pump, are described with atomistic details and involve up to 10 000 atoms. With the Dreiding and universal force fields, we have optimized ...