摘要:

An instrument is described that allows the direct and simple measurement of small particle volume and density. Volumes of 150 &mgr; glass spheres have been measured and the technique is shown to be applicable to particles as small as 50 &mgr;.

ISSN:0034-6748    

DOI:10.1063/1.1686427

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

A simple inexpensive method for manufacturing a cryogenic reservoir is presented.

ISSN:0034-6748    

DOI:10.1063/1.1686428

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

The application of a microchannel plate image intensifier to ion beam monitoring is described.

ISSN:0034-6748    

DOI:10.1063/1.1686429

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

A simple rectangular cavity is described for use over a 6–1 range of frequencies using the TEm,o,nmodes. These modes give a convenient set of operating frequencies and can easily be obtained using copper plates in the cavity as mode suppressors. High voltage leads enter the cavity through choke joints.

ISSN:0034-6748    

DOI:10.1063/1.1686430

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

In this Note, we point out that the high‐reflectance reststrahlen bands of many crystals may be used as wavelength‐selective mirrors for far‐infrared lasers (8–150 &mgr;). Wavelength coincidences between selected laser transitions and the peaks of some crystal reststrahlen bands are given. Using the reststrahlen band at 9 &mgr; in fused quartz, we have produced oscillation on the 9.0065 &mgr; transition in XeI, with the exclusion of all other transitions.

ISSN:0034-6748    

DOI:10.1063/1.1686431

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

Surface dust and oxidation may be easily removed from a pool of mercury by embedding the material in a film of collodion which is poured onto the mercury and then removed.

ISSN:0034-6748    

DOI:10.1063/1.1686432

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

Miniature shielded cables for use in cryostats can be built by running Teflon‐insulated niobium wires through 0.397 mm o.d. cupronickel tubes. The cables are designed to minimize their thermal conduction and are flexible and solderable.

ISSN:0034-6748    

DOI:10.1063/1.1686433

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

A change in geometry from that of the usual laboratory zeolite pump provided more efficient thermal insulation. Zeolite was packaged in a manner which gave a large surface‐to‐volume ratio and effective heat transfer during bakeout and cooling.

ISSN:0034-6748    

DOI:10.1063/1.1686434

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

A technique for measuring the thickness of thin films deposited on curved substrates is described. Conventional multiple beam interferometry with a flat Fizeau plate normally cannot be used with great precision on curved surfaces since the Fizeau fringe spacing is not constant. The technique described in this note takes into consideration the modified Newton's rings which result from such a measurement and gives a precise method of calculating the film thickness.

ISSN:0034-6748    

DOI:10.1063/1.1686435

出版商:AIP    

年代:1974

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1686437

出版商:AIP    

年代:1974

数据来源: AIP