摘要:

Observed signal characteristics and measurement accuracy are described for a recently developed noncontacting optical velocity sensing method as applied to extended moving surfaces. This method is based on an optical heterodyne measurement of the difference between two Doppler shifts which are produced in the light scattered through two different angles by the moving surface. It provides convenient measurements of velocity components tangent to extended surfaces that are optically rough. Absolute accuracies to at least 0.1%, and relative accuracies to 0.04% are reported.

ISSN:0003-6951    

DOI:10.1063/1.1653147

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

The EPR of As75, Sb121, and Sb123substitutional donors implanted in silicon have been observed. The Si‐P3 and Si‐P1 center resonances associated with the damage were also observed. Samples were implanted at room temperature to fluences of ∼ 1013ions/cm2, and the EPR spectra associated with the damage and the implanted impurities were monitored as the samples were isochronally annealed to 970 °C. The spectra of the implanted donors were observed after the 400 °C anneal with illumination and following the 600 °C anneal without illumination. After the anneal at ∼ 900 °C, the proportion of implanted antimony that is observed by EPR to be substitutional is significantly larger than for the implanted arsenic.

ISSN:0003-6951    

DOI:10.1063/1.1653148

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

It is found that theKLLcarbon Auger spectrum is strongly influenced by the chemical state of the carbon. This is expected since theLelectrons in carbon are the valence electrons. We have found that it is possible to distinguish between surface carbon and adsorbed CO on the basis of this carbon Auger spectrum. This sensitivity to the chemical state of the emitting atom when the Auger electron is ejected from the valence band suggests that this measurement may be useful in determining bonding of surface atoms.

ISSN:0003-6951    

DOI:10.1063/1.1653149

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

A determination of the relative signs of the nonlinear optical coefficients that give rise to second harmonic generation has been made for each of the following crystals: LiNbO3, LiTaO3, BaTiO3, ZnO, and LiGaO2. It is found thatd33andd31have the same signs in LiNbO3, LiTaO3, BaTiO3, and LiGaO2. In ZnO, LiGaO2, and LiTaO3, the ratiosd33/d31,d33/d32, andd31/d22, respectively, are negative.

ISSN:0003-6951    

DOI:10.1063/1.1653150

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

By field‐annealing barium sodium niobate crystals in the presence of H2O and D2O vapor it is established that protons diffuse into the crystals. As a result of this diffusion, the crystal resistivity is found to increase by a factor of ∼2×103. It is concluded that diffusion of protons into ferroelectric barium sodium niobate and other high‐temperature ferroelectrics is necessary before the crystal dipole moment can be freely reversed by an external electric field.

ISSN:0003-6951    

DOI:10.1063/1.1653151

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

A technique is described for the analysis of surface composition on the basis of characteristic loss features associated with electron impact ionization of inner atomic levels. The method involves separating the characteristic loss spectrum from the total secondary emission spectrum by superimposing a small oscillation on the primary beam energy and detecting only those features which fluctuate at the same frequency. Ionization spectroscopy is shown to have a number of inherent advantages over conventional Auger spectroscopy.

ISSN:0003-6951    

DOI:10.1063/1.1653152

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Theoretical computation of recombination waves in Au‐doped Si is reconsidered introducing new expressions of the carrier lifetimes, deduced from a linearized theory of the generation‐recombination process kinetics. The comparison with previous theoretical and experimental papers is given. The role of the temperature and dc electric field on the instability condition is examined.

ISSN:0003-6951    

DOI:10.1063/1.1653153

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Amplifier gain measurements were made on the dye rhodamine 6G in ethanol. Gain was measured as a function of wavelength and time for a 1 × 10−4Msolution. The peak gain coefficient was measured to be 95 dB/m at a pump energy of 21.5 J. This same pump energy produced 55 mJ of laser output from a 3.8‐cm‐long cell in a mode diameter of 3.6 mm.

ISSN:0003-6951    

DOI:10.1063/1.1653154

出版商:AIP    

年代:1970

数据来源: AIP

ISSN:0003-6951    

DOI:10.1063/1.1653156

出版商:AIP    

年代:1970

数据来源: AIP