摘要:

A description is given of a method of modifying the mirror‐drive mechanism in a commercial Fourier transform spectrometer in order to double the resolution. Comparative spectra are given which were taken before (resolution ≈ 0.050 cm−1) and after the modification (resolution ≈ 0.026 cm−1).

ISSN:0034-6748    

DOI:10.1063/1.1686324

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

A commercial quadrupole mass filter has been modified to accept a channel electron multiplier. The modification is relatively simple and inexpensive. The resulting mass filter is very sensitive (gain > 107) and compact.

ISSN:0034-6748    

DOI:10.1063/1.1686325

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

A potentiometric circuit is described which can be used to control the temperature or other physical variables affecting two matched resistors in the circuit. The control is such as to hold the ratio of the difference of the resistances to one of the resistances constant.

ISSN:0034-6748    

DOI:10.1063/1.1686326

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

Increased stability for electrodeless discharge lamps used in atomic spectroscopy is attained by mounting a heater coil below the lamp. Heating by convection maintains the lamp at a constant temperature resulting in stable output within 2%.

ISSN:0034-6748    

DOI:10.1063/1.1686327

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

Lichtenberg figures have been studied, using high‐speed image‐converter photography, current and voltage measurements, and measurements of radiated light intensity.

ISSN:0034-6748    

DOI:10.1063/1.1686328

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

The design and operation of a simple gas circulating pump is described. This pump incorporates a piston with an O‐ring seal and hollow glass check valve and is capable of circulating gases over a large pressure range, 769–1 Torr. The pump could conceivably operate at lower pressure by changing the check valves. During pumping operations the leak rate was less than 1 &mgr; (for 400–500 cycles). The maximum pumping speed is about 110 cm3/sec although greater pumping rates can be obtained from larger pumps. The pump is designed so that it can be easily disassembled for cleaning.

ISSN:0034-6748    

DOI:10.1063/1.1686329

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

A gain measuring apparatus is described which yields information on the temporal and spatial gain properties of pulsed CO2TEA lasers. The technique permits the observation of a probe beam amplitude prior to, during, and after amplification though a gain medium under investigation.

ISSN:0034-6748    

DOI:10.1063/1.1686330

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

A load cell for combined axial load and torque with good sensitivity and repeatability and low cross talk is described. The instrument consists of a maraging steel tube with gimbal mounted dc differential transformers to sense the axial deflection and twist of the tube. Free‐Flex pivots were used in the gimbals to minimize friction.

ISSN:0034-6748    

DOI:10.1063/1.1686331

出版商:AIP    

年代:1973

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1686332

出版商:AIP    

年代:1973

数据来源: AIP