摘要:

The collector electrode of a thermionic converter requires a material having a low thermionic work function and chemical stability in a Cs atmosphere in the 800 °K range. This letter reports that ZnO with an adsorbed Cs film meets these requirements. The work function is approximately 1.3 eV. Various methods of preparing the ZnO film are described as well as an experiment in which Cs was replaced by K.

ISSN:0003-6951    

DOI:10.1063/1.88978

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

Heating of laser‐produced plasmas by an instability is investigated through a nonlinear theory that does not treat the laser as a perturbation. It is found that the peaking of the anomalous absorption occurs only for a certain laser power. Comparison has been made with experiment.

ISSN:0003-6951    

DOI:10.1063/1.88979

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

The regrowth of Si crystal from amorphous layers created by Si implantation into ⟨111⟩, ⟨100⟩, and ⟨110⟩ Si was studied. Channeling effect measurements show that the growths on the ⟨110⟩ and ⟨100⟩ substrates are epitaxial and linear with time. For the ⟨111⟩ samples the growth at 550 °C was significantly slower and nonlinear in time and the regrown layer contained a high concentration of defects. TEM micrographs indicate the presence of stacking faults and/or microtwins in the ⟨111⟩ samples.

ISSN:0003-6951    

DOI:10.1063/1.88980

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

A method is reported for capless annealing of ion‐implanted GaAs which gives electrical activation of Se‐implanted wafers nearly identical to that obtained with sputtered silicon nitride caps. State‐of‐the‐art performance has been realized from Schottky‐gate FET’s fabricated from this material.

ISSN:0003-6951    

DOI:10.1063/1.88981

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

Experimental study of charge transfer between highly stripped ions of carbon and noble‐gas atoms was conducted. One‐ and two‐electron transfer to C+3, C+4, and C+5was observed. The ions were obtained from plasma generated by a pulsed high‐power CO2laser. 422

ISSN:0003-6951    

DOI:10.1063/1.88982

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

Photodiodes have been made from thin films ofp‐type (Pb,Sn)Se on BaF2substrates. Surface inversion using Pb barriers has given devices with D* (10.1 &mgr;m) ≳5×1010cm Hz1/2 W−1andD* (11.5 &mgr;) ≳2×1010cm Hz1/2 W−1at 77 K with zero‐bias resistance‐area products up to 2 &OHgr; cm2. Quantum efficiencies of the best devices were about 0.5.

ISSN:0003-6951    

DOI:10.1063/1.88983

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

We have observed 18 cw laser transitions in Ne‐Ag mixtures spanning the wavelength region from 408.6 to 585.2 nm. The upper laser levels of Ag II are judged to be pumped by a charge‐transfer reaction between a ground‐state neon ion and a ground‐state Ag I atom resulting in simultaneous ionization and excitation of the silver atom. Output characteristics of the Ag II laser transitions as a function of neon pressure and discharge current are presented. The two strongest transitions are 478.8 and 502.7 nm in the blue and green, respectively.

ISSN:0003-6951    

DOI:10.1063/1.88984

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

The output energy and pulse shape of XeF/KrF lasers pumped by fast discharges were measured at various gas compositions and total pressures. For the KrF laser, the maximum output (1.6 mJ) was obtained in a gas mixture of He:Kr:NF3=100:5:0.2 at a total pressure of 700 Torr. The output energy density was 160 mJ/l, and the electrical efficiency was 0.06%. The peak power was 55 kW. For the XeF laser, the maximum output (10 mJ) was obtained in a gas mixture of He:Xe:NF3=100:4:2 at a total pressure of 500 Torr. The peak output power was 1 MW. The output energy density (660 mJ/l) was a factor of 10 higher, and the efficiency (0.5%) was a factor of 2.5 higher than reported earlier.

ISSN:0003-6951    

DOI:10.1063/1.88985

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

A simple theory and experimental results are presented which describe the efficient transport of soft x radiation through hollow glass tubing by means of multiple grazing‐incidence internal reflection. It is shown that a large number of such tubes can be used to remotely image weak plasma sources of soft x radiation. The efficiency of transport through bent tubes and the use of light pipes as low‐pass filters for x radiation are discussed.

ISSN:0003-6951    

DOI:10.1063/1.88986

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

The possible advantages of employing neon‐dominated gas mixtures in e‐beam laser cavities are discussed, and cross sections for selective excitation of N2+, CO+, and CO2+in charge‐transfer collisions between Ne2+and N2, CO and CO2are reported. The magnitudes of these cross sections (measured using beam techniques) compare favorably with analogous measurements involving He2+reactant ions, suggesting that laser action in neon‐dominated mixtures might be achieved. The addition of helium to the ion source was observed to increase the Ne2+beam current; however, the accompanying increased photon yield was greater than the percentage increase in the beam current, indicating that vibrationally relaxed Ne2+is preferred. It is suggested that ’’seeding’’ a neon‐filled e‐beam laser cavity with helium could increase the over‐all efficiency of such a device.

ISSN:0003-6951    

DOI:10.1063/1.88987

出版商:AIP    

年代:1976

数据来源: AIP