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Single Photon Ionization (SPI) via Incoherent VUV-Excimer Light: Robust and Compact Time-of-Flight Mass Spectrometer for On-Line, Real-Time Process Gas Analysis F. Mu1hlberger, J. Wieser, A. Ulrich,§ and R. Zimmermann,,|
* GSF-Forschungszentrum GmbH, Institut fu¨r O¨ kologische Chemie, D-85764…

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However, no standard technique is available for the on-line analysis of organic compounds occurring at low concentrations in process gases. In principle, mass spectrometric methods with direct inlet sampling systems are well-suited for on-line monitoring. The standard 70 eV electron impact…

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involved either in the ionization process (i.e., the two-photon ionization process in REMPI) or the generation of the ionization laser pulses (i.e., the frequency-tripling process for generating VUV photons for SPI). Because of this nonlinear process, the final output signal, s (i.e., ion current),…

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cess. Excimer molecules form in three body collisions from the energetically high-lying excited levels of rare gas atoms (11.8, 10.0, and 8.4 eV in Ar, Kr, and Xe, respectively).26 Therefore, the rare gas atoms have to be excited to high electronic levels in cold dense gases in which molecules can…

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intensities can be obtained in the pulsed mode. The minimum pulse width is given by the excimer kinetics and is on the order of several hundreds of nanoseconds for Ar and Kr at typically 1 bar. The pulsing mode was used in most of the experiments described here in order to achieve maximum VUV light…

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be measured by using a VUV-sensitive solid state detector next to the gas sample in the ion source. The light-producing rare gases were circulated by a metal bellows compressor through the light source and an external (800 °C) titanium rare gas purifier. A fixed gas filling and a small getter pump32…

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ular weight compounds, heated inlet and sampling systems, as described previously,5,34 will be applied. The sampling gas flow through the capillary was 10 mL/min (standard conditions). Data acquisition was performed either via a 250 MHz 1 GS/s transient recorder PC card (acqiris, Switzerland) or by…

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(Stanford Research Instruments Inc., model DG535). The timing of the processes is shown in Figure 5. The electron beam was gated by switching the extraction voltage of the electron gun. The cathode filament was operated continuously at typically 6 V and 20 µA. At 12 µs after enabling the electron…

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tion of the detection limit, the raw mass spectrum was smoothed (boxcar averaging over 0.25 mass units) in order to remove highfrequency electronic noise. Detection limits in the low parts-permillion (v/v) range were determined for the BTX compounds according to the method described in a previous…

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related species, such as the xylene isomers and ethylbenzene, can be considered as being very similar. (C) Discussion. The results presented clearly demonstrate that the invented electron-pumped rare gas excimer VUV-lightsource time-of-flight mass spectrometer is, in principle, a versatile…

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corresponds to 2.6 × 1018 photons/s (Ar2
* excimer). With a XUV detector with an active field of 20 mm2 (IRD Inc. type AXUV-20) placed in the ionization region of the TOFMS, a photon flux of 2.3 × 1014 photons/s was detected during the VUV light pulse. This corresponds to a light collection factor of…

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time-of-flight mass spectrometer.44-46 In the latter approach, the ion cloud is injected after an enrichment time from the Paul trap into the TOFMS for mass analysis. However, these methods are rather sophisticated and possibly preferably suited for laboratory-based systems. For process gas monitors…

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