摘要:

Laser emission is obtained from forward biased evaporated metal barriers on degeneratep‐PbTe andp‐Pb0.8Sn0.2Te atT=4.2°K. Metals with small work functions such as In, Pb, and Zn produce a degenerate invertedn‐type surface region onp‐type samples without chemical doping. Low‐threshold laser emission has been obtained from these barriers onp‐PbTe at &lgr; = 6.4&mgr; and from Pb barriers onp‐Pb0.8Sn0.2Te at &lgr; = 15&mgr;.

ISSN:0003-6951    

DOI:10.1063/1.1653031

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

The properties of high‐density injection intop‐InSb at 77 °K are compared with theory. An extension of Dean's theory is in satisfactory agreement with the extensive observations which include density‐dependent growth times.

ISSN:0003-6951    

DOI:10.1063/1.1653032

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

The photoconductivity edge in amorphous films of GeTe or GeSe is found to shift toward lower photon energies with the application of high electric fields. Electrical measurements indicate that the shift is a bulk effect, not due to junctions at the contact‐semiconductor interface.

ISSN:0003-6951    

DOI:10.1063/1.1653033

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

The lattice disorder produced by 42‐keV Hg ions implanted in B‐doped Si at room temperature has been measured by means of the channeling and of the backscattering of 2‐MeV He ions. An annealing effect connected to B concentration is observed.

ISSN:0003-6951    

DOI:10.1063/1.1653034

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

A continuous DF chemical laser is reported. Population inversion is obtained by diffusing D2into a supersonic free jet containing F atoms. Output power of the DF laser is compared with a similar HF laser previously reported. The ratio of DF to HF laser output power is 0.7 for fixed supersonic jet conditions and the same molar flow of H2and D2. The efficiency of conversion of chemical energy to laser energy is approximately 12 and 8 % for the HF and DF lasers, at power levels of 475 and 340 W, respectively.

ISSN:0003-6951    

DOI:10.1063/1.1653035

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Continuous laser action has been observed on several HF and DF vibrational‐rotational transitions. The HF lases between 2.6 and 2.9&mgr; and DF lases between 3.6 and 4.1&mgr;. The lines are identified and the relative intensities are shown.

ISSN:0003-6951    

DOI:10.1063/1.1653036

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

We report a new class of resonant interactions of circularly polarized microwaves with powderedn‐type InSb, which is observed only in the cyclotron resonance inactive polarization, at magnetic fields independent of particle size. The new powder resonance is a multiparticle analog of the single‐particle magnetoplasma resonance first reported by Dresselhaus, Kip, and Kittel. Both the position and strength of the observed powder resonance are discussed quantitatively using the Rayleigh extinction cross section for a single particle.

ISSN:0003-6951    

DOI:10.1063/1.1653037

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Optical pumping of Rb or Cs subject to relaxation through the formation of relatively long‐lived alkali‐rare‐gas molecular complexes is shown to yield a unique distribution of population throughout the magnetic sublevels of the alkali ground state. Large overpopulations of the sublevels of the upper hyperfine state are obtained for a particular range of the ratio of pumping rate to relaxation rate. The technique may make feasible the construction of a Cs maser.

ISSN:0003-6951    

DOI:10.1063/1.1653038

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

Hot‐electron emission has been observed through the top surface of the Au electrode in Al&sngbnd;SiO&sngbnd;Au cold cathodes. Previous investigations have indicated that electrons which have undergone coherent scattering in the Au electrode may only be emitted from pinhole edges. The present measurements are found to be consistent with the existing theory.

ISSN:0003-6951    

DOI:10.1063/1.1653039

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

The presence of a 1000‐Å‐thick evaporated nickel layer on the exit surface of a sapphire disk lowers the laser power required for crystallographic‐type damage. A tentative explanation involves a shock phenomenon induced by a confined metal vapor.

ISSN:0003-6951    

DOI:10.1063/1.1653040

出版商:AIP    

年代:1970

数据来源: AIP