摘要:

A flash‐evaporation scheme modified to control the rate of the powder fed to the evaporator was used for depositing GaAs films on amorphous glass substrates. A bulk wurtzite form of GaAs was identified with x‐ray diffraction and found to have an axial ratio of 1.684. Periodic faulting induced by the plunger movement of the powder feeder is believed to cause the formation of this phase. Structural analysis of the flash evaporated films was performed using a Fourier line broadening analysis and integral breadth measurements. A least‐squares approximation of the ``Warren‐Averbach'' method yielded particle sizes of 125 Å and rms microstrains of 0.0018. The films were doped during growth with germanium, indium and tin. Germanium doping producedp‐type films while both indium and tin doping producedn‐type. Mobilities greater than 0.5 cm2/V·sec were found for a narrow range of doping (1018−1019/cm3) for the tin doped films. The films grown with no auxiliary dopant werep‐type with carrier concentrations exceeding 1019/cm3and mobilities near 0.01 cm2/V·sec.

ISSN:0021-8979    

DOI:10.1063/1.1657395

出版商:AIP    

年代:1969

数据来源: AIP

摘要:

Hyperbolic equations with a differential constitutive relation of dynamic yielding are numerically integrated without the pseudoviscosity. The scheme is shown to be stable and the resulting shock profiles are smooth. The example of iron shows a good agreement with those of the viscosity method and suggests that a stable profile will emerge as mesh sizes decrease.

ISSN:0021-8979    

DOI:10.1063/1.1657396

出版商:AIP    

年代:1969

数据来源: AIP

摘要:

CaF2films were deposited onto (100) cleavage faces of NaCl in a high‐vacuum bell‐jar system. The dependence of structure on substrate temperature and film thickness was studied by transmission electron microscopy and diffraction. When the substrate temperature was around 350°C during deposition, a simple(100)CaF2&bigsl;&bigsl;(100)NaClwith⟨110⟩CaF2&bigsl;&bigsl;⟨100⟩NaClepitaxial monocrystalline orientation was found. Complex(110)CaF2&bigsl;&bigsl;(100)NaClwith average⟨111⟩CaF2&bigsl;&bigsl;⟨100⟩NaClepitaxial polycrystalline orientations were found when the substrate was in the 150°–250°C range during deposition. Hard‐sphere models of the CaF2and NaCl faces were used to interpret these results qualitatively.

ISSN:0021-8979    

DOI:10.1063/1.1657397

出版商:AIP    

年代:1969

数据来源: AIP

摘要:

In the Drude approximation, and for long wavelengths, the real partnof the complex indexn˜=n−ikof island films of metals is shown to be independent of the electronic properties of the parent metal, and of the wavelength of radiation. The value of the index is found to depend on the Maxwell Garnett density parameterqonly, and is always greater than one, in agreement with experimental results.

ISSN:0021-8979    

DOI:10.1063/1.1657398

出版商:AIP    

年代:1969

数据来源: AIP

摘要:

The effect of modulation broadening on the shape of the Fourier coefficientaoLdescribing an unsaturated, Lorentzian absorption line is examined theoretically and experimentally. An unusual feature, not previously observed, is the development of two equal maxima when the normalized modulation amplitude (1/&bgr;) exceeds (2)1/2. Expressions are derived for the position and amplitude of these maxima as a function of (1/&bgr;). Experimental evidence confirming these expressions is presented.

ISSN:0021-8979    

DOI:10.1063/1.1657399

出版商:AIP    

年代:1969

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1657400

出版商:AIP    

年代:1969

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1657401

出版商:AIP    

年代:1969

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1657402

出版商:AIP    

年代:1969

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1657403

出版商:AIP    

年代:1969

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1657405

出版商:AIP    

年代:1969

数据来源: AIP