摘要:

A Monte Carlo calculation has been used to calculate the high‐field transport properties of CdTe where the full complexity of the band structure has been taken into account. Comparison with experimental results yields basic transport parameters, e.g., deformation potential for nonequivalent intervalley scattering.

ISSN:0003-6951    

DOI:10.1063/1.1654135

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Josephson tunnel junctions have been fabricated incorporporating a thin layer of normal metal which is oxidized to form the tunnel barrier. The tunnel devices tested were of the form Nb/Al/Al2O3/Nb and several milliamperes of Josephson current were observed at 4.2°K. These samples have been found to have better defined tunneling characteristics than samples of the form Nb/NbOx/Nb.

ISSN:0003-6951    

DOI:10.1063/1.1654136

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

The relative Raman cross sections of gases which are of interest in air pollution studies have been measured at 5145 Å. These relative differential cross sections compared to that of N2are as follows: O3(4.0), CH4(8.0), C3H8(2.4, 5.8), NO (0.55), N2O (2.7, 0.53), and H2(2.2). The absolute Raman cross section for N2has been revised to be (4.4±1.7) × 10−31cm2/sr at 5145 Å, for vertically polarized input and 90° scattered Raman radiation that is not analyzed for its polarization.

ISSN:0003-6951    

DOI:10.1063/1.1654137

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

The cathodoluminescence of AgGaS2, a I‐III‐VI2ternary chalcopyrite compound, has been studied in the 2.1–2.8‐eV range at 300, 77, and 21 °K. At 300 and 77 °K the annihilation of free excitons is observed, while at 21 °K only extrinsic transitions appear. A study of the polarization shows that the excitonic lines are polarizedE∥C.

ISSN:0003-6951    

DOI:10.1063/1.1654138

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Evaporated Sn layers on Si and sapphire substrates were used to demonstrate the applicability of the backscattering technique to measurement of the fraction of covered area, the average thickness of the layer, and the sticking factor for temperatures over the range 77–400 °K. The sticking factor at 293°K was found to be ⅓ of that at 77 and 393 °K, and 19% higher at room temperature (r.t.) for Sn on Sn as compared with Sn on Si. At 393 °K the fraction of covered area was found to be about 60% and the average island thickness was in the range 450–1000 Å.

ISSN:0003-6951    

DOI:10.1063/1.1654139

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

A simple model which predicts the large signal losses in charge‐coupled devices due to fast‐interface‐state trapping is presented, and the predictions of the model are verified by experimental measurements of losses in two‐phase CCD's.

ISSN:0003-6951    

DOI:10.1063/1.1654140

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

A survey has been made of optical attenuation in a series of commercially available silica, SiO2, samples to determine the suitability of this material for fiber optical communications. The absorptive component of the attenuation was measured by a precision calorimetric technique, while the scattering component was determined by a new method based on spontaneous Brillouin spectroscopy. Both techniques set an upper limit on the loss and are precise to within a fraction of 1 dB/km. Of the samples tested, the best has a total attenuation of less than 3 dB/km at the 1.06‐&mgr; wavelength of the YAlG : Nd laser.

ISSN:0003-6951    

DOI:10.1063/1.1654141

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

A ruby laser has been operated in the circular TE01mode by means of a novel mode selector. Construction, output characteristics, conversion into TM01, and possible applications are described.

ISSN:0003-6951    

DOI:10.1063/1.1654142

出版商:AIP    

年代:1972

数据来源: AIP