摘要:

The phase equilibrium of the LiVO3‐LiNbO3pseudobinary system has been investigated, and a LiNbO3single‐crystal thin film has been grown epitaxially onto the substrate by dipping ac‐plate LiTaO3substrate into a LiVO3flux solution. An x‐ray rocking curve indicated that the film had a high single crystallinity with good epitaxy. The composition ratio Li/Nb of the film was estimated to be close to the stoichiometric value Li/Nb≈1.0.

ISSN:0003-6951    

DOI:10.1063/1.88229

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

The propagation characteristics of 75‐MHz ultrasonic waves through molecular films of arachidic acid have been investigated. On thermal cycling through the melting temperature the ordered films break up into islands of disordered arachidic acid. With the help of an ultrasonic pulse‐difference technique we could detect changes in the transmitted signal when arachidic acid islands as thin as 500 A˚ changed from the solid to the liquid state. It is suggested that similar experiments at higher frequencies could be of value in the investigation of phase changes and general structural properties of biological membranes.

ISSN:0003-6951    

DOI:10.1063/1.88230

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

The normal mode of vibration of (111) GaAs wafers with a thickness below about 15 &mgr;m was found to depend strongly on the surface preparation and on the ambient atmosphere. This dependence was attributed to effects directly related to the surface stress &sgr;s. It was shown that &sgr;scan be evaluated from the natural frequency of vibration. The values of &sgr;s, in the ⟨110⟩ direction, for etched and unetched (111) GaAs wafers in room atmosphere were found to be 325 and 570 dyn/cm, respectively. It was further demonstrated that surface stress transients due to the adsorption processes (adsorption transients) can be determined by corresponding changes in the natural frequency of vibration.

ISSN:0003-6951    

DOI:10.1063/1.88231

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

The interaction of a dense high‐temperature theta pinch plasma with 0.2‐mm‐diam spherical polystyrene pellets is reported. The pellets are not displaced by the plasma sheath implosion. They are not completely vaporized and the vaporized material is not ionized after many half‐cycles of theta pinch action. The vaporized material remains neutral in the midst of the hot plasma for the duration of the experiment. The cloud ionization is increased by focusing a 1‐JQ‐switched ruby laser on the cloud after the initial plasma vaporization.

ISSN:0003-6951    

DOI:10.1063/1.88232

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

A two‐stage process of atomic displacement involving both elastic and inelastic energy transfer is presented, in order to account for the number and distribution of primary defects in ion‐bombarded semiconductors and insulators. Some experimental tests are proposed.

ISSN:0003-6951    

DOI:10.1063/1.88233

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

An electro‐optic streak camera incorporating a storage memory video system has been developed and used to instantly visualize and record the shape of a 1.06‐&mgr;‐wavelength pulse generated by a mode‐locked Nd:YAG laser. The duration of a single laser pulse (∼30 psec) has been directly measured with and without laser amplification.

ISSN:0003-6951    

DOI:10.1063/1.88234

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

A copper vapor laser operating at a wavelength of 5106 A˚ and a pulse repetition rate up to 30 000 pulses/sec has been constructed and investigated. The best results obtained to date are as follows: energy and power density of 35 &mgr;J cm−3and 1.7 kW cm−3; pulsewidth 20 nsec; average density 0.7 W cm−3; laser efficiency 1&percent;.

ISSN:0003-6951    

DOI:10.1063/1.88235

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

Threshold conditions are given for the sustained operation of standing‐wave and long‐pulse traveling‐wave two‐photon lasers. Pulse shortening in long‐pulse two‐photon amplification, a behavior absent in the one‐photon case, is also demonstrated analytically.

ISSN:0003-6951    

DOI:10.1063/1.88236

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

A scalable transverse self‐sustained discharge maintained between an array of flow‐stabilized cathodes and a common anode has demonstrated specific input powers of 800 W/g/sec and power densities of 100 W/cm3per cathode for CO2‐N2‐He mixtures at pressures of 50–70 Torr. Optical extraction at 15&percent; efficiency has been obtained under nonoptimized conditions in a geometry with the parallel fluid flow and discharge electric field perpendicular to the optical axis.

ISSN:0003-6951    

DOI:10.1063/1.88237

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

Absolute infrared frequency measurement has been extended to 148 THz (the highest frequency ever directly measured) with measurement of the two strong cw laser lines of Xe. The frequencies were synthesized with stabilized CO2and 3.39‐&mgr;m He‐Ne lasers and mixed on a W‐Ni point‐contact diode. The measured frequencies are &ngr;Xe(2.0&mgr;m)=147.915 850(15) THz and &ngr;Xe(3.5&mgr;m)=85.459 997(3) THz.

ISSN:0003-6951    

DOI:10.1063/1.88238

出版商:AIP    

年代:1975

数据来源: AIP