摘要:

The design and operation of sample preparation equipment utilized in inelastic electron tunneling spectroscopy is described. This equipment has been assembled in the bell jar of a commercially available vacuum deposition facility.

ISSN:1073-9149    

DOI:10.1080/10739148208543541

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

New power supplies and scan generators have been designed and constructed for a standard electrostatic analyzer and for a high impedance magnet. These analyzers were used in the fabrication of a home-built mass spectrometer/mass spectrometer.

ISSN:1073-9149    

DOI:10.1080/10739148208543542

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Details for the construction of two power supplies involved in the production of silicon emitters and their operation in a field desorption mass spectrometer are described.

ISSN:1073-9149    

DOI:10.1080/10739148208543543

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

A 6502 microprocessor based system has been developed for control, end point detection, and determination of elapsed electrolysis time for a constant current coulometer. The coulometer consists of operational amplifier controlled current source, differential potentiometric end point detection circuitry, and a KIM-1 microprocessor controlled timer/concentration level indicator. The differential potentiometric indicating electrode potential is compared with a user selected end point potential. When the preset end point potential is exceeded the electrolysis current is shut off automatically. The on-board 6530 interval timer is used to display either time in hundreths of a second or sample concentration directly. The system is applied to the determination of chloride ion in natural water samples. A detection limit of one part-per-million is noted. Relative standard deviations of less than two percent were obtained for analyzed standard chloride samples. Harware, software, and instrumentation are discussed.

ISSN:1073-9149    

DOI:10.1080/10739148208543544

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Computer assisted background correction in Room Temperature Phosphorimetry, RTP, is shown to be a reliable means of obtaining phosphorescence signals, especially in regard to its use for estimating limits of detection and precision of measurement. This approach is considerably faster and more reliable than conventional approach. Several model phosphorescent compounds are evaluated by the computer assisted and the conventional approaches. An Apple computer is interfaced to an Aminco-Bowman spectrophotofluorometer with phosphorescence attachment.

ISSN:1073-9149    

DOI:10.1080/10739148208543545

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

A small, self powered, portable photometer designed for field use is described. It has a four position sample holder, a digital peak hold, and integrator, autoranging over four decades and uses an LCD calculator as a readout device.

ISSN:1073-9149    

DOI:10.1080/10739148208543546

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

ISSN:1073-9149    

DOI:10.1080/10739148208543547

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor