Leco Pegasus HRT

Pegasus GC-HRT – the high resolution MS:

Not exactly a table-top model, but size matters!. Pegasus HRT is also a TOF and has a 20m (or 40m, gives a better resolution) flight tube. This is achieved by a so called Folded Flight Path (FFP) which again makes the analyser – relatively – compact.
Ikke ligefrem en bordmodel, men “size matters”.
Because of the long flight path the system can reach a resolution of 50.000, still at a respectable “total scan” frequency of 200Hz.
HRT can also be delivered with a Multi Mode Source, an ion source which enables both EI and CI (+/-), thus, you do not need any source change by changing between EI and CI.,

This is the instrument for demanding non-target GC analyses, where the combination of good EI (and/or CI) spectra together with exact mass spectra is essential for the identification of unknowns in the chromatogram. However, this does not help if you also handle isomers in the analysis. Here GCxGC is yet another essential tool, see below:


Due to the high scanning speed and the robust pump system Pegasus GC-HRT is also particularly suitable for GCxGC analysis. Because of the cold-spot refocusing before the second dimension, in GCxGC the individual peaks are considerably sharper than conventional GC analysis. The system has, due to the long flight path, “only” a scan speed of up to 200 spectra / sec, and it is therefore necessary with a small compromise in terms of the number of scans per peak.

The sharpest peaks, down to 35msec, can only be expected to reach 5-6 scans over the peak, and peaks in 35 – 50msec interval can therefore be expected to be less accurate quantitated.

However, the combination of comprehensive GC and a high-resolution MS is a unique combination in the identification of unknowns. Again, it is essential that the software can manage the GCxGC data, that it is robust, logically constructed, and operates each time. This is what ChromaTOF does.

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