摘要:

A flash tube of annular design, improved flash circuitry, and a photomultiplier enabler circuit are described. Results obtained with this apparatus indicate that the system quickly delivers a large number of photons into an absorption cell (viz., ∼6×1016photons/cc with about 5 &mgr;sec 1/etime and 50 &mgr;sec total decay time) and is thus suited for studies of fast photochemical kinetics.

ISSN:0034-6748    

DOI:10.1063/1.1716789

出版商:AIP    

年代:1960

数据来源: AIP

摘要:

A circuit is described which permits the timing of slow pulses (e.g., 300‐m&mgr;sec rise time) to good precision (e.g., ±3 m&mgr;sec) over a wide range of pulse heights (e.g., 6 v to 120 v) and at high counting rates (average separation≳4 &mgr;sec. This is useful particularly in coincidence spectroscopy with NaI(Tl) scintillators.

ISSN:0034-6748    

DOI:10.1063/1.1716790

出版商:AIP    

年代:1960

数据来源: AIP

摘要:

The temperature controller described here is capable of heating a fine wire (of the order of a few mils in diam) to some temperature between 700°C and the melting temperature, and holding the temperature constant to within a few degrees.The detector is a photomultiplier that monitors radiation from the center of the wire; changes in radiation result in compensating changes in the current. The controller responds within a millisecond to sudden changes in the environment of the wire. This rapid response is useful for detecting the onset of ignition in reactive gases and perhaps for measuring the thermal properties of nonreactive gases.

ISSN:0034-6748    

DOI:10.1063/1.1716791

出版商:AIP    

年代:1960

数据来源: AIP

摘要:

A technique is outlined to control the stray field of electrolytic cells in a predictable and simple manner. The technique is particularly useful in biological impedance work and in determinations of the dielectric constant of solutions of high conductivity. It is based on a plot of the apparent dielectric constant as a function of electrode distance. In a logarithmic presentation the apparent dielectric constant appears as the sum of the true dielectric constant and two linear functions, representative of electrode polarization and stray field component. A few examples are given to illustrate the technique and its limitations.

ISSN:0034-6748    

DOI:10.1063/1.1716792

出版商:AIP    

年代:1960

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1716793

出版商:AIP    

年代:1960

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1716795

出版商:AIP    

年代:1960

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1716797

出版商:AIP    

年代:1960

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1716798

出版商:AIP    

年代:1960

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1716799

出版商:AIP    

年代:1960

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1716800

出版商:AIP    

年代:1960

数据来源: AIP