摘要:

Various experimental results are reported on the dc‐induced optical effects in CdS. Possible explanations are also given.

ISSN:0003-6951    

DOI:10.1063/1.1652457

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

A high‐power noble gas cw ion laser has been constructed using a tungsten disk structure capable of dissipating over 70 kW of input power. Quasi‐continuous laser outputs in the near ultraviolet have been observed at 3638 and 3511 Å of ArIII and true cw output was obtained at 3507, 4067, and 4131 Å of KrIII. The latter has been identified as a new cw laser line. Over one watt of quasi‐continuous output was demonstrated with the 3638‐Å line. However, high‐power continuous output in the uv is limited by serious optical degradation effects.

ISSN:0003-6951    

DOI:10.1063/1.1652458

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Time‐resolved emission spectra from flashlamp‐pumped organic dye lasers were recorded with an image converter camera. The characteristics of several dyes are examined and compared. The rhodamine dyes showed uniform spectral output, but other dyes showed irregular time dependent spectral output.

ISSN:0003-6951    

DOI:10.1063/1.1652459

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Previously published data on the conductivity changes induced in rutile (TiO2) by an applied field are reinterpreted in the light of new information on the behavior of donor impurities in this crystal. It is suggested that the large increase in conductivity which is usually observed is electronic in nature, and is due to an increase in H+interstitial concentration. The H is introduced at the anode, probably by electrolysis of H2O, migrates through the crystal under the influence of the applied field, then is neutralized at the cathode and escapes from the crystal. Enhanced conductivity results when migration of H+near the cathode is inhibited by Ti4+interstitials, thus increasing H+concentration in the bulk. Other possible mechanisms are considered.

ISSN:0003-6951    

DOI:10.1063/1.1652460

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

This paper describes a new form of acoustical and microwave holography which obviates the need for a real or electronically simulated reference wave. The use of linear (rather than square-law) detectors permits recording of the instantaneous non-time-averaged object wave potential within the acoustic or microwave cycle rather than the intensity of the sum of an object wave and a reference wave time-averaged over many cycles. The time at which the recording is made is the reference rather than a real or electronically simulated reference wave. To achieve the effect of a plane reference wave making an angle &thgr; with the hologram plane, it is necessary to record the object wave potential instantaneously along a straight line on the hologram at the same time as the recording line is swept with velocity v across the plane in the direction perpendicular to the line. Then sin&thgr; = a/v, where a is the speed of the acoustic or microwave radiation. The feasibility of this method is demonstrated by recording and reconstructing a 4.8-MHz temporal reference acoustical hologram made with a Sokolov ultrasonic camera system.

ISSN:0003-6951    

DOI:10.1063/1.1652461

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Infrared absorption measurements were made before and after low‐temperature electron irradiations of silicon samples which contained either dispersed oxygen, carbon, or carbon plus oxygen. Two distinctly different centers are formed upon low‐temperature irradiation depending upon the carbon and oxygen content. One center is the well‐known vacancy‐oxygenA‐center defect (836 cm−1) and is formed in oxygen‐containing silicon with a magnitude which is independent of the carbon content. The other center (922 and 932 cm−1) is formed only in silicon crystals which containbothoxygen and carbon. The results indicate that this center is formed by the trapping of a silicon interstitial at a carbon‐oxygen complex.

ISSN:0003-6951    

DOI:10.1063/1.1652462

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

The transient gyromagnetic behavior of the one‐dimensional 180° Bloch walls in thin films is analyzed based on the Landau‐Lifshitz equation for distributed systems. The physical model of gyromagnetic spin motion in the wall is found adequate in explaining wall streaming (or worm motion). The key mechanism is the induction of a large transverse magnetostatic field resulting from discrepancy in switching speeds in the wall and the adjoining regions. The dependence of wall displacement on pulse shapes and film parameters is examined.

ISSN:0003-6951    

DOI:10.1063/1.1652463

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

The phenomenon of hydrogen promotion of field evaporation has been applied to the problem of producing stable images of highly perfect gold FIM specimens. Well developed, stable end forms of gold specimens were obtained by first field evaporating the gold specimen in a 0.5% H2&sngbnd;He gas mixture, then removing the hydrogen gas, and finally imaging the surface in a 25% Ne&sngbnd;He gas mixture. The imaging temperature of the specimen was ∼ 16°K. Details of the experimental observations concerning hydrogen promotion of field evaporation, and the characteristics of the gold end form are reported.

ISSN:0003-6951    

DOI:10.1063/1.1652464

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Amplification of longitudinal acoustic waves traveling in a thin piezoelectric ceramic plate was achieved by electrically coupling the elastic waves to the drifting carriers in ann‐silicon plate. Amplification up to 15 dB/cm in the 2‐MHz range was obtained, and the system was also operated as a tunable oscillator and mixer in the 0.5‐ to 4‐MHz range. In addition, these experiments also enabled us to measure the drift mobility of majority carriers in silicon.

ISSN:0003-6951    

DOI:10.1063/1.1652466

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

The existing theory of electric conduction in solids fitted with blocking contacts has been modified to include the effect of a series resistance. Experimental current‐voltage curves for trigonal Se with indium electrodes are reported which show the essential features predicted by our theoretical analysis.

ISSN:0003-6951    

DOI:10.1063/1.1652467

出版商:AIP    

年代:1968

数据来源: AIP