摘要:

Phosphorus‐32 has been diffused into (111), float‐zone, silicon in hydrogen atmosphere from an epitaxially grown P‐32‐doped silicon source layer. P‐32 concentration profiles obtained show Fickian behavior and provide much lower diffusion coefficients than reported in the literature using oxide dopant sources on a free surface.

ISSN:0003-6951    

DOI:10.1063/1.1653338

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Raman backscatter of aQ‐switched ruby laser beam from SO2and CO2molecules were selectively detected in the polluted atmosphere by means of a laser‐Raman radar system. The spectrum of these Raman components was compared quantitatively with that for the ordinary and sulphur dioxide atmospheres, along with the estimation of relative concentrations of these molecules.

ISSN:0003-6951    

DOI:10.1063/1.1653339

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Heterojunctions ofnZnSe&sngbnd;pGe switched from a high impedance to low in 100 nsec when a threshold voltage is exceeded. Resetting occurs in the opposite bias direction in 10 nsec after sufficient current is applied. Either state is maintained with all bias removed for a minimum of two weeks.

ISSN:0003-6951    

DOI:10.1063/1.1653340

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Capture coefficients and reflected flux distributions have been measured for nitrogen molecular beams impinging on solid nitrogen surfaces. For a beam intensity of 1.53×1016molecules/sec cm2and incident energies from 0.44 to 0.76 eV, the capture coefficient was found to decrease with increasing angle of incidence as measured from the surface normal. The angle of maximum reflected intensity was approximately 75° from the surface normal and independent of incident angle and energy. Transient effects were observed for surfaces without a previous cryodeposit.

ISSN:0003-6951    

DOI:10.1063/1.1653341

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

The measurement of the time of flight of ions in an inhomogeneous oscillatory electric field is used to spearate ions of different mass‐to‐charge ratios. Analytical and experimental results are reported.

ISSN:0003-6951    

DOI:10.1063/1.1653342

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Perimeters only of thin films have heretofore been observed on crystal substrates by x‐ray topography. It has been found that the entire film/crystal interface can be exhibited in like fashion if asymmetric diffraction is used to produce the topograph.

ISSN:0003-6951    

DOI:10.1063/1.1653343

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Optical heterodyne detection of 10.6‐&mgr; radiation has been performed with metal‐to‐metal point contact diodes, using a 30‐MHz IF. The minimum detectable power of 9.1×10−14W/Hz is the lowest value ever reported at 10&mgr; for a room‐temperature detector operating at megahertz frequencies.

ISSN:0003-6951    

DOI:10.1063/1.1653344

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

It is shown that the light emission of the positive column of a low‐pressure are discharge and its efficiency can be enhanced, up to a factor of 6, by pulsing or modulating the discharge current with a repetition time (or modulation period) between the diffusion time &tgr;Dand the energy relaxation time &tgr;Eof the electrons (&tgr;D≫ &tgr;E). Calculations indicate this phenomenon to be due to an increase of the number of electrons in the high‐energy tail of the energy distribution function, as compared with that of a steady‐state discharge.

ISSN:0003-6951    

DOI:10.1063/1.1653345

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

The microwave emission fromn‐InSb was measured at 1.5 GHz in order to obtain information about the strong anisotropy observed whenBis rotated in the transverse plane. It was found that the preparation technique has a great influence on the emission. Cylindrical samples with etched surfaces behave isotropically; purposely introduced surface damage by sandblasting a narrow strip parallel to the sample axis reduced the emission for the case thatBis normal to the blasted area. Generation of the emission occurs in the whole sample.

ISSN:0003-6951    

DOI:10.1063/1.1653346

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Spatially resolved gain measurements at 10.6&mgr; have been made transverse to the discharge in an axially flowing CO2laser amplifier. These show a nonuniform gain throughout the discharge with maximum gain at the upstream end of the positive column. Increasing the flow velocity shifts the gain profile and leads to an over‐all increase in gain. Spatial intensity profiles of the sidelight emission of CO2at 4.3&mgr;, CO at 0.48 and 2.3 &mgr;, and N2at 3371 Å are shown.

ISSN:0003-6951    

DOI:10.1063/1.1653347

出版商:AIP    

年代:1970

数据来源: AIP