摘要:

The time dependence of the thermal defocusing of a laser beam has been studied. Under certain conditions the beam is found to expand linearly with time, under others it expands with a time dependence approachingt1/2.

ISSN:0003-6951    

DOI:10.1063/1.1651973

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

It is shown experimentally that only at ``larger'' field strengths is the electron current from cold‐cathode Al&sngbnd;Al2O3&sngbnd;Au structures dominated by photoelectron emission released in the top layer through electroluminescence radiation within the oxide.

ISSN:0003-6951    

DOI:10.1063/1.1651974

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Radiation damages created in silicon single crystals bombarded with 10‐keV aluminum ions were examined by means of electron diffraction method. A deep penetration of aluminum ion in silicon was observed, extending to 0.58 &mgr;. This penetration was depressed by removing the bombarded surface layer about 800 Å in thickness before annealing. From these results, we interpret the deep penetration as a radiation enhanced diffusion effect.

ISSN:0003-6951    

DOI:10.1063/1.1651975

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Linewidths in the normal Raman spectra of several liquids of interest in stimulated Raman scattering have been measured including carbon disulfide, benzene, toluene, oxygen, and nitrogen. The spectra were excited with 6328‐Å radiation from a He‐Ne laser and examined with a pressure‐scanned Fabry‐Perot interferometer.

ISSN:0003-6951    

DOI:10.1063/1.1651976

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Microwave second‐harmonic generation is observed in germanium when a microwave power density gradient exists within the sample. This second‐harmonic thermoelectric voltage is proportional to the incident microwave power for low power levels and is found to begin to saturate as the power level approaches 1 mW. This voltage could be utilized to directly measure the energy relaxation time of free charge carriers.

ISSN:0003-6951    

DOI:10.1063/1.1651977

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Amplification of ultrasonic waves at 225 MHz up to 20 dB has been achieved by the dc operation inn‐InSb under the transverse magnetic field at 77°K. If we assume that dc and ac mobilities have different dependence on the magnetic field, most of the characteristic features of the observed results are well explained.

ISSN:0003-6951    

DOI:10.1063/1.1651978

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Six of the seven allowed electric dipole transitions between the hyperfine levels of theJ= 7/2 lambda doublet in the 10th vibrational level of theA2&pgr;3/2state of CN were observed. The transitions at frequencies between 1580 and 1650 MHz occur between the more populated negative parity levels and the positive parity levels. The stimulated emission was detected by measuring an increase in the intensity of theB2&Sgr;+→X2&Sgr;+(0, 0) violet band of CN near 3875 Å.

ISSN:0003-6951    

DOI:10.1063/1.1651979

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Using the channeling technique for locating foreign atoms in crystals, we have obtained direct experimental evidence of an irreversible motion of In and Tl atoms from substitutional to interstitial sites during the annealing of ion‐implanted silicon samples. Preliminary Hall measurements indicate that a corresponding transition fromp‐ ton‐type behavior also occurs in the same temperature region — viz. 525–575°C. Implantation conditions were 1–3 × 1014ions/cm2at 40 keV, with the substrate at 350–450°C to prevent lattice disorder from accumulating.

ISSN:0003-6951    

DOI:10.1063/1.1651980

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

A population inversion for the 00°1 → 10°0 (10.6 &mgr;) transition in CO2has been created by resonant collisional transfer of excitation from thermally excited N2.

ISSN:0003-6951    

DOI:10.1063/1.1651981

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Tungsten films were found to be superconducting at 3.2°K. Upon investigation by x‐ray and electron diffraction, a &bgr;‐W (A15) structure was evident. Superconducting tunneling studies revealed that the ratio 2&Dgr;(0)/kTcvaried from 2.32 and 3.64 and &Dgr;(T)/&Dgr;(0) vsT/Tcfollowed the BCS theory.

ISSN:0003-6951    

DOI:10.1063/1.1651982

出版商:AIP    

年代:1968

数据来源: AIP