QITTOF

Quadrupole ion trap—time-of-flight mass spectrometer 2005 QitTof MS 0.9 Syage, 11.3.4... 

The main benefits of QitTof relative to other MS systems are ... 

QitTof enables fast TOF detection compared to ITMS only. 

QitTof enables mass-selective analysis by MS" analysis compared to TOFMS only. 

A 30-lb field-portable quadrupole ion trap TOF (QitTof) mass spectrometer with an atmospheric photoionization source was constructed [17]. The photoionization source has the ability to choose a narrow-band ionization energy that is sufficiently high to ionize and detect most compounds of interest but low enough to avoid ionization of most common air constituents, such as N2, 02, H20, C02, CO, Ar, etc. Fragmentation is minimal because ionization occurs just above the ionization thresholds, with very little excess energy. The ion trap stores ions from a continuous ionization source followed by pulsed extraction into the TOF mass analyzer. 

The QitTof mass spectrometer has MS" capability. Its mass resolution, m/Am, for mass 181 amu, ranges from 100-200 for a 22-cm flight-path linear TOF analyzer to 400 for a 38-cm coaxial reflectron configuration. 

The Guardian Explosives Detection Security Portal (Fig. 6) is manufactured and marketed by Syagen Technology, Inc., of Tustin, CA [48], This portal was the result of two research and development efforts that included collaboration between Syagen and Sandia National Laboratories, funded by TSL, and a project at Sandia, funded by DOE [33,49], The detector utilized in the portal is a quadrupole ion trap, time-of-flight (QitTof ) mass analyzer [50,51], The mass analyzer identifies explosives by time-of-flight and mass-to-charge (m/z) ratio, which increases the accuracy of the identification of the explosive. The foundation of the sample collection method in this portal is an air shower [52],... 

Figure 8.11 The FieldMate prototype combined EI-PI QitTof mass spectrometer (Image courtesy of Syagen).

Syagen has developed a prototype portable MS instrument called the FieldMate. It has both electron impact (El) and photoionisation (PI) sources and a quadrupole ion trap, time-of-flight (QitTof) mass analyser. It has MS-MS capability and can be interfaced with a GC (Figures 8.11 and 8.12). It weighs just under 32 kg and its dimensions are 45.7 X 40.6 X 35.6 cm. FieldMate permits direct air and liquid sampling using the PI source. 

The development of hybrid instruments started from magnetic sector-quadmpole hybrids, either BqQ [221,222], EBqQ, [223] or BEqQ [224-226]. Numerous other systems such as magnetic sector-QIT [227], magnetic sector-oaTOF [228,229], QITTOF [138,230,231], QqTOF [49,232-234], QqLIT [108], LITICR, andQqlCR followed (Table 4.3). 

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