Mass spectrum VUV (Vacuum Ultraviolet) photoionization source device for in-source collision induced dissociation
A collision-induced dissociation and ionization source technology, applied in mass spectrometers, measuring devices, parts of particle separator tubes, etc. problems, to achieve precise and deterministic analysis, small size, and accurate quantitative results
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Embodiment 1
[0046] For the investigation of the collision-induced dissociation effect in the mass spectrometer VUV photoionization source device of the present invention, a sample gas of 100 ppm is configured with n-heptane for detection, the carrier gas is 99.999% high-purity nitrogen, and the mass analyzer adopts time-of-flight mass analyzer. Adjust the air pressure in the chamber of the ionization source to 0.15 Torr, keep it constant, and gradually increase the electric field strength at the lower end of the ion repeller electrode. The n-heptane mass spectrum signals measured under different electric field strengths are as follows: figure 2 shown. Visible at weaker electric field strengths (such as figure 2 2V / cm, but not limited to 2V / cm, depending on the pressure in the ionization source cavity), the ions in the ionization source are mainly sample molecular ions generated by VUV photoionization, and the obtained spectrum is simple, which can be determined according to the molecul...
Embodiment 2
[0049] In view of the examination of the performance of the mass spectrometer VUV photoionization source device of the present invention for quickly resolving isomers, taking the resolution of xylene and ethylbenzene isomers as an example, 99.999% high-purity nitrogen gas was prepared respectively as the carrier gas The 100ppm xylene and 100ppm ethylbenzene standard sample gases are detected, and the mass analyzer adopts a time-of-flight mass analyzer. During the measurement, the air pressure in the ionization source chamber was kept constant at 0.15 Torr. Under the same sample injection conditions, the mass spectra of xylene and ethylbenzene measured at different ionization source electric field strengths were as follows: Figure 4 shown. It can be seen that with the increase of the electric field strength of the ionization source, the m / z106 molecular ions of xylene and ethylbenzene will be dissociated by the collision-induced dissociation in the source to generate m / z91 fra...
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