IBM XT/AT data acquisition and processing system for Bruker ER 200D-SRC and ER 420 electron paramagnetic resonance spectrometers

Abstract

Abstract. Module giving IBM PC format of the EPR spectra recorded by Bruker ER 420 and ER 200D-SRC spectrometers is described. The files thus stored may be used for post-acquisition spectral processing using any program for this purpose and any IBM compatible PC.In the recent models of EPR spectrometers produced by Bruker Company (ESP 300, ESP 380E), which are computer controlled, and run under OS 9 operating system, a software feature (KERMIT) for transforming spectral files in MS DOS format (Motorola to Intel conversion) is provided [1,2]. The files thus transformed can be used further for post-processing and/or manipulation of spectra using IBM compatible PC satellite data station working with recently developed by Bruker Company specialized program (EPR-WIN) [3]. In this way the EPR spectrometer computer and the spectrometer itself are enabled for other spectra recording or acquisition and therefore the spectrometer time is saved. This feature however is not available for the other Bruker EPR spectrometers, for example, those of the series ER 200D-SRC which were offered in the period 1982--87 with ASPECT 2000 and since 1988 up to now consecutively with ESP 1600, ESP 1620 or ESP 3220 data system as option or the "old" one -ER 420 spectrometer. Thus many spectrometers still available in good technical condition are working without that feature. Keeping in mind the mentioned flexibility and conveniente of the post-acquisition spectra processing and manipulation on separate PC, in this communication is described a home-built module giving IBM PC format of the EPR spectra recorded by Bruker spectrometers equipped with ER 001 time base module, for example ER 200D-SRC, as well as ER 420 EPR spectrometers.

Data acquisition card for varian electron paramagnetic resonance spectrometers

“…The card, as already mentioned, has a Programmable Interval Timer which makes it instrument independent, i.e. the data sampling frequencies can be programmed without the need to include a clock to externally synchronize the card with the timing module of a particular spectrometer, as is the case of [1].…”

“…Some authors have improved data processing capacities of some Bruker EPR systems [1], that already have data acquisition capabilities as regular or optional features, by interfacing the spectrometer with present-day Personal Computers (PCs). This gives those spectrometers the possibility of externally storing files that may be used for post-acquisition spectral processing using any program for this purpose and any IBM compatible PC.…”