Low Temperature and Small Sample Spectra Obtained by FTS with a Large Computer
An RIIC Model 720 Far Infrared Interferometer (without dedicated computer) was adapted to BCD paper tape output for processing via a teletypewriter by a General Electric Model 635 Computer installation. Spectra can be returned to the teletypewriter within minutes after transmission of the tape. A number of sub-programs were developed to remove errors from the experimental data and to allow for both a quick survey of the results and for their most useful final presentation. A quantitative accuracy of about 5% was attained.
A number of apparatus changes and additions were performed to make possible low temperature studies of very small samples. Spectra obtained in this way at temperatures below ambient are indicative of phase and structural changes in a number of materials investigated.
Some coordination compounds of palladium with sulfur and selenium undergo linkage isomerism near room temperature. The identification of characteristic frequencies and estimation of reaction rates is facilitated by the already available numerical output, which can be processed further.
KeywordsFast Fourier Transformation Paper Tape Spectral Ordinate Linkage Isomerism Tape Reader
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