摘要:

A method for destructive detection of the state of charge storage in a metal‐SiO2‐Si capacitor is presented. This method is based on the modulation by the charge of the efficiency of separation of electron‐hole pairs which are generated by the penetration of an electron beam into the capacitor.

ISSN:0003-6951    

DOI:10.1063/1.1653137

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Certain room‐temperature cholesteric liquid crystals are capable of retaining information on their past history of electric field excitation by exhibiting marked changes in their optical transmission properties. The information retention slowly decays but in many cases persists for at least several days following the removal of excitation. Thus 100 V applied across a 25 &mgr; sample for 10 min caused a change in transmission at 5000 Å from 75 to about 22%. Sixty hours later, the transmission was about 48%.

ISSN:0003-6951    

DOI:10.1063/1.1653138

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

With normal electron incidence, the resolution of the backscattered electron image in the scanning electron microscope (SEM) is approximately equal to the classical electron pentration depth. With oblique electron incidence, a significant number of plurally scattered electrons leave the specimen in an apparently specular direction after penetrating for a distance that is an order of magnitude smaller than this. Thus with 15‐keV electrons incident onto Al at 45°, a significant number of backscattered electrons leave the specimen after penetrating to less than 500‐a.u. depth. These electrons can be collected over an angle that is close to the plane of the specimen surface. Other electrons leave the specimen more nearly at right angles to the surface, and these have been scattered from a greater depth. The image in the SEM can change completely if the position of the collector is changed.

ISSN:0003-6951    

DOI:10.1063/1.1653139

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

The elastic modes of propagation in an infinite plate are coupled to the propagating magnetostatic modes when the plate material is magnetoelastic. The dispersion relations for these magnetoelastic modes are derived, and the resulting coupled mode spectrum is discussed.

ISSN:0003-6951    

DOI:10.1063/1.1653140

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

It is shown that ac electric fields can produce orientational oscillations in nematic liquid crystals. The oscillations are observed in thin sandwich cells and probably due to parametric excitation. They are associated with a strong electro‐optic effect, similar to dynamic scattering, but with faster turn‐off times (< 5 msec).

ISSN:0003-6951    

DOI:10.1063/1.1653141

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

We report a reversible optical damage effect when KDP is illuminated in the presence of an applied electric fieid. The damage is slight and has a relaxation time of seconds, but it produces a substantial reflection when the illumination takes the form of a standing wave. An experiment to observe this phenomenon, using a ring laser, is described. The damage is attributed to trapping of photoexcited electrons.

ISSN:0003-6951    

DOI:10.1063/1.1653142

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

The two highest frequency measurements as yet reported are described. Frequencies of the 28‐ and 78‐&mgr;m cw water vapor laser lines were found to be 10.718073±0.000002 THz and 3.821775±0.000003 THz, respectively, by beating each of these radiations with the 337‐ and 373‐&mgr;m (0.89‐ and 0.80‐THz) radiation from an HCN laser, in a metal‐on‐metal point‐contact diode. The frequencies of the HCN laser were in turn measured by beating the 337‐&mgr;m radiation with 74‐GHz radiation and by measuring the 337‐ and 373‐&mgr;m frequency difference.

ISSN:0003-6951    

DOI:10.1063/1.1653143

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

By focusing a laser beam in neon, we experimentally study the validity of several multiphoton ionization theories by varying the energy of the emitted photons.

ISSN:0003-6951    

DOI:10.1063/1.1653144

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Current oscillations in CdS samples with optically polished parallel surfaces have been observed as a result of motion of high‐field domains formed by the large acousto‐electric effect due to reflection of ultrasound which builds up to large amplitude provided by net round‐trip gain. The experimental results also point to different kinds of oscillations.

ISSN:0003-6951    

DOI:10.1063/1.1653145

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

A theory for the observation of current oscillations in CdS samples with parallel end surfaces due to motion of domains is presented. The theory agrees very well with the experiment.

ISSN:0003-6951    

DOI:10.1063/1.1653146

出版商:AIP    

年代:1970

数据来源: AIP