ISSN:0034-6748    

DOI:10.1063/1.1717427

出版商:AIP    

年代:1961

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1717428

出版商:AIP    

年代:1961

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1717429

出版商:AIP    

年代:1961

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1717430

出版商:AIP    

年代:1961

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1717431

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

An improved Wrede gauge having the following characteristics is described: (a) a response time of ∼1 sec, (b) sensitivity sufficient to detect ∼10−5mm Hg partial pressure of atoms. This has been accomplished by (a) reducing the trapped volume bounded by the catalytic surface and the effusion diaphragm, and using 130 effusion holes of 0.020 mm diam in plastic films of 6.4×10−3mm thickness and by (b) balancing the atom‐induced pressure difference across the effusion holed as sensed by a capacitative pressure transducer with an electrostatic pressure and recording the square of the voltage between the capacitator elements. Possible sources of error when the device is used to measure the decay of atoms in pulsed afterglows of long duration are discussed.

ISSN:0034-6748    

DOI:10.1063/1.1717432

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

A high speed computer program for the kinematical analysis of bubble chamber events is described. The program treats individual particle interaction or decay vertices, subjecting the measured variables to the equations of energy and momentum according to the least‐squares criterion. This is done in four different cases in which the problem is overdetermined, and a fifth case is calculated in which the problem is just determined. The adjusted or computed variables corresponding to each particle are obtained in all cases as well as the first‐order error matrices for each type of variable. A connected chain of vertices may be processed in sequence.

ISSN:0034-6748    

DOI:10.1063/1.1717433

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

An interference comparator has been built for the routine calibration of line standards or scales by direct reference to the vacuum wavelength of the 0.606 &mgr; line of Kr86which has recently become the international standard of length. The principles of construction and the performance of the comparator are given; it is shown to yield an accuracy of calibration which is mostly limited by the nature of present‐day line standards or scales, viz., a few hundredths of a micron in lengths up to one meter.

ISSN:0034-6748    

DOI:10.1063/1.1717434

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

A 10.7‐Mc cw reference oscillator drives the cathode of a planar triode grounded‐grid amplifier, which is normally cut off by −20 v on its plate. The grounded planar grid forms a perforated region in the wall of a copper can which otherwise totally shields both the cw oscillator and the planar cathode. Radio‐frequency energy, which leaks capacitively from that cathode through the grounded grid to the negative plate, is bypassed to ground at the plate through a conducting diode. A positive gate voltage applied to the plate switches off the bypass diode and causes the grounded grid stage to amplify the rf voltage on its cathode. The following power amplifier stage, whose input is dc coupled, develops about 100‐v rf output during the positive gate. When the gate is off, the output of the power amplifier is ≤10−7v. The carrier suppression ratio is therefore ≥109, or 180 db. The ungated cw signal is continuously available. Circuitry, leakage measurement, and shielding are described in detail.

ISSN:0034-6748    

DOI:10.1063/1.1717435

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

An instrument has been developed which readily stabilizes to within 0.1% the intensity of a well‐defined beam originating in a high pressure xenon arc lamp. Fluctuations due to changes in current or arc position are compensated by a shunt‐type regulator connected across the lamp.

ISSN:0034-6748    

DOI:10.1063/1.1717436

出版商:AIP    

年代:1961

数据来源: AIP