摘要:

Stability measurements on liquid charged Teflon FEP electrets are reported. The initial decay is nonexponential and strongly dependent on experimental conditions, while the long‐term decay is dependent on foil material and temperature. However, in all cases, there appears to be a single rate‐limiting process with a measured activation energy equal to 1.9 ± 0.1 eV.

ISSN:0003-6951    

DOI:10.1063/1.1654861

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

Large single crystals of lead potassium niobate were grown by the method of pulling from a melt, and their piezoelectric properties were preliminarily investigated. The crystals have ferroelectric tungsten bronze structure with a Curie point of about 460°C. Spontaneous polarization lies perpendicular to thecaxis as in ferroelectric PbNb2O6. Particularly large electromechanical coupling factors were measured; i.e., 0.69 ± 0.03, 0.73 ± 0.03, and 0.59 ± 0.01 fork15,k24, andkt, respectively. Temperature coefficients of the fundamental resonant frequencies iny‐ andz‐cut plates were found to be <30 ppm around room temperature.

ISSN:0003-6951    

DOI:10.1063/1.1654862

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

In order to clarify the poisoning mechanism of the LaB6cathode, the temperature dependence of oxidation on a single‐crystal surface was examined by Auger electron spectroscopy. The oxidation gives the chemical effect on the La and B Auger peaks. Evidence from the Auger spectra indicates that the oxygen is more strongly bound to La ions than B ions on the surface. A correlation between the oxidation and the poisoning characteristics was established, and possible reasons for the correlation are discussed.

ISSN:0003-6951    

DOI:10.1063/1.1654863

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

Although the wavelength of maximum scattering in cholesteric liquid crystals is strongly angularly dependent, doping with nematics can produce systems in which the angular distortion is considerably reduced, thus making color display applications much more feasible.

ISSN:0003-6951    

DOI:10.1063/1.1654864

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

A number of arguments are presented to demonstrate that the minimum‐energy state is not accessible to a system of droplets produced by electrohydrodynamic spraying.

ISSN:0003-6951    

DOI:10.1063/1.1654865

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

An analysis of the Doppler ambiguity for the laser Doppler velocimeter is presented which accounts for the signal statistics based on a Gaussian beam intensity. Results are in excellent agreement with experiment.

ISSN:0003-6951    

DOI:10.1063/1.1654866

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

Laser action was observed in GaAs epitaxial films using corrugation feedback. The output wavelength was found to depend on the corrugation period. The loss, threshold gain, and feedback parameters were determined and compared with theoretical predictions.

ISSN:0003-6951    

DOI:10.1063/1.1654867

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

Heterodiodes have been prepared by liquid‐phase epitaxy ofn‐type CdSnP2from Sn solution ontop‐type InP. Electroluminescence is observed near 1.4 &mgr; with internal quantum efficiencies of 10% at 77°K and 1% at room temperature. The photovoltaic response of typical diodes shows moderate quantum efficiencies (4–12%) in the near infrared (1.2–1.0 &mgr;).

ISSN:0003-6951    

DOI:10.1063/1.1654868

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

The modulation of guided optical waves has been accomplished using an integrated ferroelectric thin‐film structure. LiTaO3was rf sputtered onto 7059 glass in an argon‐oxygen environment. Electrodes for applying the modulation signal were formed by chemically etching an interdigital pattern in gold which was rf sputtered onto the LiTaO3. The observed modulation of guided waves launched in the ferroelectric film can be attributed to the linear electro‐optic effect.

ISSN:0003-6951    

DOI:10.1063/1.1654869

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

Multiple photon absorption of laser radiation at 2660 and 3547 Å is used to pump excimers of Xe and Ar. Line narrowing is observed in bands ∼ 100 Å wide, centered at 1730 and 1260 Å, respectively.

ISSN:0003-6951    

DOI:10.1063/1.1654870

出版商:AIP    

年代:1973

数据来源: AIP