Composite ionization source based on vacuum ultraviolet light ionization and atmospheric pressure ionization
A technology of atmospheric pressure ionization and vacuum ultraviolet light, which is applied in the field of composite ionization sources, can solve problems such as limiting vacuum ultraviolet photoionization ionization efficiency, limiting photon energy, and limited optical density, and achieves the effect of improving ionization efficiency and detection sensitivity and broadening the range
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[0021] Such as figure 1 As shown, a composite ionization source based on vacuum ultraviolet photoionization and atmospheric pressure ionization includes a vacuum ultraviolet light source 1, an ionization chamber cavity 2, an ion funnel 3 and an atmospheric pressure ionization source 4, and samples are arranged on the walls of the ionization chamber cavity 2 5 ports for gas capillary, 8 ports for vacuum gauge and 7 ports for mechanical vacuum pump.
[0022] The ion funnel 3 is placed inside the ionization chamber cavity 2, and a DC voltage and a radio frequency voltage are applied to the ion funnel 3; the ion funnel 3 is composed of 70 electrode sheets with a thickness of 0.5mm, and the applied DC voltage forms 16V / cm DC electric field, applied RF voltage frequency is 800kHz, peak-to-peak value is 70V p-p The ion funnel 3 can focus the ions that are not on the axis to the axis, and transmit them to the ion trap mass analyzer 9 below the ion funnel 3 for analysis.
[0023] An ...
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