Abstract

A McPherson 225 vacuum uv spectrometer has been interfaced with an IBM 1130 computer. The electronic interface, consisting mainly of integrated circuits, translates computer commands for a dc synchronous stepping motor which controls the grating position. Intensity information is recorded in digital form on a magnetic disk and may be plotted on a Calcomp plotter. A strip chart recorder is operated simultaneously. Reproducibility of the grating position as determined with a mercury source is within 0.03 Å on the average.

© 1970 Optical Society of America

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References

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  1. Proceedings of the “Beam Foil Spectroscopy” Conference, Tucson, November 1967 (Gordon and Breach, New York, 1968).

Other (1)

Proceedings of the “Beam Foil Spectroscopy” Conference, Tucson, November 1967 (Gordon and Breach, New York, 1968).

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Figures (8)

Fig. 1
Fig. 1

Timing diagram for a complete cycle of automac. McPh—enable line to data scaler; step—control lines to Slo-Syn motor; BEAM—enable line to control scaler; IL 3—Interrupt Level 3 (response from computer); Pset Ct—preset count line; Ch W Gt—channel write gate to SAC. Time not to scale.

Fig. 2
Fig. 2

Logic diagram.

Fig. 3
Fig. 3

A photograph showing the interface control panel.

Fig. 4
Fig. 4

A photograph showing the power supplies and current digitizers.

Fig. 5
Fig. 5

Three successive forward scans over the 2652.04-Å, 2653.68-Å, and 2655.12-Å lines in the Hg spectrum.

Fig. 6
Fig. 6

Three successive backward scans over the 2652.04-Å, 2653.68-Å, and 2655.12-Å lines in the Hg spectrum.

Fig. 7
Fig. 7

A comparison between a forward scan (AF) and a backward scan (AB) over the 2652.04-Å, 2653.68-Å, and 2655.12-Å lines in the Hg spectrum.

Fig. 8
Fig. 8

Lyman series in hydrogen. Beam was 300-keV HHH+. Stripper foil was thin carbon (3-5 μg/cm2). Total acquisition time was approximately 15 min.

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