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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.
A new ion source is described, which produces slow ion beams of I + > 10 −2 A cm −2 with extraction voltages V e x t r ≳10 2 V V e x t r ≳ 1 0 2 V and a relatively small spread.
Continuous laser action has been observed on several HF and DF vibrational‐rotational transitions. The HF lases between 2.6 and 2.9μ and DF lases between 3.6 and 4.1μ. The lines are identified and the relative intensities are shown.
The properties of high‐density injection into p ‐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.
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.
Hot‐electron emission has been observed through the top surface of the Au electrode in Al☒SiO☒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...
Laser emission is obtained from forward biased evaporated metal barriers on degenerate p ‐PbTe and p ‐Pb 0.8 Sn 0.2 Te at T =4.2°K. Metals with small work functions such as In, Pb, and Zn produce a degenerate inverted n ‐type surface region on p ‐type samples without chemical doping....
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.
A continuous DF chemical laser is reported. Population inversion is obtained by diffusing D 2 into 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...
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