摘要:

Conditions for effective intrinsic gettering by oxide precipitate induced dislocations, which we suggest as an important mechanism in explaining device leakage limited yield enhancement due to oxygen in Czochralski‐grown Si wafers, are examined. The effectiveness of this mechanism is demonstrated.

ISSN:0003-6951    

DOI:10.1063/1.89340

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

The time‐averaged current induced by incident radiation across electronic tunneling junctions is shown experimentally and theoretically to have a highly nonlinear dependence on the field intensity for a range of tunneling barrier thickness.

ISSN:0003-6951    

DOI:10.1063/1.89341

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

The combined effects of trapping of resonance radiation of a more abundant isotope of a gas or vapor (leading to a preferential ionization of the more abundant isotope) and cataphoresis (forcing the preferentially ionized isotope towards the cathode) will be shown to result in an enriched deposition of the less abundant isotope in the anode region of a dc discharge tube. Large isotope enrichment factors and high efficiencies appear to be possible for initially low‐abundance isotopes.

ISSN:0003-6951    

DOI:10.1063/1.89342

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

The insulation and ion generation characteristics of coaxial magnetically insulated diodes were tested using microsecond voltage pulses from a Marx generator with magnetic fields ranging up to 20 kG, voltages of 150–300 kV, and gap widths of 0.3–0.9 cm. Voltage standoff was observed for up to 4 &mgr;sec when using graphite or metallic electrodes. With plasma‐producing nylon filament anodes, high‐energy ion beam pulse lengths of up to 2 &mgr;sec and total charge generation densities of up to 7.5 &mgr;A sec/cm2were obtained.

ISSN:0003-6951    

DOI:10.1063/1.89343

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

The isotope ratio in metal deposits obtained by sputtering a flat target at low ion energy (100 eV) under normal ion incidence is a function of the ejection angle. The lighter isotope (s) are enriched in the direction normal to the target surface as result of ’’reflective collisions’’ which occur when an atom collides with one of heavier mass underneath. Experimental results are presented for Cu(63‐65) and the seven Mo isotopes.

ISSN:0003-6951    

DOI:10.1063/1.89344

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

In ambient atmosphere, a protuberant shock wave driven by laser‐produced fast ions was observed by time‐resolved photographs with 5‐&mgr;m and 30‐psec resolutions. This protuberant shock wave appeared only when the incident laser intensity exceeded 5×1013W/cm2. At this intensity, the fast ions were observed using the charge collectors.

ISSN:0003-6951    

DOI:10.1063/1.89345

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

Hysteretic losses have been measured on a large number of Nb3Ge samples prepared by the chemical vapor deposition process. These measurements were performed as a function of induced current and temperature on samples which contained differing amounts of second‐phase material, Nb5Ge3. It was found that very low 50‐Hz losses, on the order of 20 &mgr;W/cm2at 500 rms A/cm and at temperatures of up to 12 K, could be attained in as‐deposited material. An apparent correlation between the critical current density and the Nb5Ge3content was observed, which suggested that enhanced pinning due to the second‐phase precipitates was responsible for these low losses.

ISSN:0003-6951    

DOI:10.1063/1.89346

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

Laser emission in the 8‐&mgr;m &ngr;2‐&ngr;5band of C2H2has been observed in electron‐beam‐controlled discharges in CO‐C2H2mixtures. Line tunability within thePandQbranches has been demonstrated using a grating‐controlled cavity. Spectroscopic measurements of the free‐running C2H2laser emission at pressures up to 4 atm indicate significant pressure‐broadened line overlap of the closely spaced (<0.2 cm−1)Q‐branch lines.

ISSN:0003-6951    

DOI:10.1063/1.89331

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

Flame‐out has been achieved under conditions representative of an atmospheric‐pressure repetitively pulsed H2‐F2laser by briefly interrupting the flow of H2between pulses using a fluidic bistable amplifier.

ISSN:0003-6951    

DOI:10.1063/1.89332

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

We show that both the shape of the electrodes and the spatial distribution of the preionization can play an important role in defining the cross‐sectional shape of uv‐preionized self‐sustained glow discharges in CO2laser mixtures. Studies of a homogeneous 10×10×100 cm3discharge are described.

ISSN:0003-6951    

DOI:10.1063/1.89333

出版商:AIP    

年代:1977

数据来源: AIP