摘要:

Significant enrichment of deuterium has been demonstrated in flowing CH4‐H2mixtures subjected to a low‐temperature glow discharge. In the best case, over 500% enrichment per stage was measured. A pronounced translational temperature effect was observed with the optimum enrichment occurring atTwall=−105 °C.

ISSN:0003-6951    

DOI:10.1063/1.89784

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

Silicon doped by neutron transmutation to 1.2×1014phosphorus atoms/cm3was investigated with deep level transient spectroscopy using evaporated Au/n‐Si diodes. Seven bulk electron traps were identified which appear after 30 min N2anneal at temperatures between 425 and 725 °C. Five of these annealed in the manner characteristic of intrinsic defects studied by EPR and ir spectroscopy. Two may be related to residual oxygen and carbon complexes.

ISSN:0003-6951    

DOI:10.1063/1.89785

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

Grain‐boundary surfaces of Al‐Zn‐Mg alloys have been studied with Auger electron spectroscopy. Particular emphasis was given to plasmon loss satellites in the Auger spectrum. It is found that the plasmon energy losses associated with Al, Zn, and Mg Auger peaks are different, and the energy losses vary with heat treatment of the alloy. These variations provide information on chemical composition and nonhomogeneities in an alloy, such as precipitation and segregation. It is shown that, at the grain boundary of aged specimens of the Al alloy, the Zn atoms are all in the form of MgZn2precipitates, but only about 40% of the total Mg is in the precipitates. The other 60% is situated outside of the precipitates.

ISSN:0003-6951    

DOI:10.1063/1.89786

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

Depth profiles for hydrogen in amorphous silicon have been determined by the use of resonant nuclear reactions [1H(15N,&agr;&ggr;)12C and1H(19F,&agr;&ggr;)16O] and by secondary ion mass spectroscopy (SIMS). Independent calibration procedures were used for the two techniques. Measurements were made on the same amorphous silicon film to provide a direct comparison of the two hydrogen analysis techniques. The hydrogen concentration in the bulk of the film was determined to be about 9 at.% H. The SIMS results agree with the resonant nuclear reaction results to within 10%, which demonstrates that quantitative hydrogen depth profiles can be obtained by SIMS analysis for materials such as amorphous silicon.

ISSN:0003-6951    

DOI:10.1063/1.89787

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

The changes in the x‐ray diffraction patterns of 16‐ and 25‐&mgr;m‐thick polyvinylidene fluoride films, caused by 6‐kV corona charging at room temperature, are presented. The diffraction peaks corresponding to (100) and (020) &agr;‐crystalline forms tend to be considerably reduced while the (110) &bgr;‐form peak changes in shape and position.

ISSN:0003-6951    

DOI:10.1063/1.89788

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

The generation of self‐sustained pulsations in degraded (GaAl)As double‐heterostructure diode lasers is explained by invoking microscale absorption centers possessing a large cross section. The microscale degradation centers are found to affect the laser characteristics at a concentration level as low as 1014–1015cm−3.

ISSN:0003-6951    

DOI:10.1063/1.89789

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

Superconducting weak links have been created by locally weakening the superconductivity of a narrow thin‐film lead strip via the evanescent field of an optical guided wave. Existence of the Josephson junction behavior of these links was confirmed by examination of their behavior in applied magnetic fields.

ISSN:0003-6951    

DOI:10.1063/1.89790

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

Operation of a new nonlinear backward‐wave optical device which produces the conjugate of an arbitrary incident wave front is demonstrated. Good‐quality reconstructed images are obtained through a phase distorting media.

ISSN:0003-6951    

DOI:10.1063/1.89791

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

Broad‐band uv flurescence is reported for LaF2 : Ce3+(2760–3120 A˚) and LuF3 : Ce3+(2880–3220 A˚). The five‐peak excitation spectrum expected for the 5dstate of Ce3+in a noncubic crystal field is observed. The fluorescence quantum yields for LaF3 : 1% Ce3+and LuF3 : 0.1% Ce3+are 0.9 and 0.82, respectively. Estimates of the threshold power for lasing action suggest that a laser system tunable from 2760 to 3220 A˚ is feasible with noble‐gas–halide lasers as pumping sources.

ISSN:0003-6951    

DOI:10.1063/1.89792

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

Lasing on the first overtone vibrational‐rotational transitions of carbon monoxide is reported. The laser is a supersonic flow laser, which uses an electric‐discharge‐excited CO/He/O2mixture. 20 W cw power at 0.6% electrical efficiency is obtained.

ISSN:0003-6951    

DOI:10.1063/1.89793

出版商:AIP    

年代:1977

数据来源: AIP