Laser sputtering ultrasonic molecular beam source-ion trap mass spectrometry device and operating method thereof
A technology of laser sputtering and ion trap, applied in the field of mass spectrometry, can solve problems such as the difficulty of highly active species
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Embodiment 1
[0041] Embodiment 1, to study the reaction of iridium hydrocarbons, the specific timing control of each part is shown in figure 2 .
[0042] Such as figure 1 As shown, in the ionization stage, laser sputtering 3 targets (in this example, iridium metal Ir) generate plasma, and then pass through the electromagnetic pulse valve into the carrier gas 4, the carrier gas is 5 atmospheres of helium containing 1-5% ethylene Gas, through ultrasonic expansion to produce a series of ions IrC x h x + ( x = 1-4), such as image 3 (a) shown.
[0043] IrC x h x + Enter the fast flow tube 5, through the electromagnetic pulse valve 1, the reaction gas I (carbon monoxide) is introduced to react with ions. The reaction in the fast flow tube is a molecule-ion reaction without the influence of an electric field. Such as image 3 As shown in (b), after passing a certain amount of carbon monoxide (CO), there are new products such as IrC 4 h 4 (CO) 2-3 + generated, demonstrating th...
Embodiment 2
[0048] Example 2, Studying IrC 2 h 2 + collision-induced dissociation experiments.
[0049] In the ionization stage, the laser sputters the iridium target 2 to generate plasma, the carrier gas 4 is helium containing a certain amount of ethylene, and a series of ions IrC produced by ultrasonic expansion x h x + ( x = 1-4). Afterwards, it passes through the fast flow tube 5 and then enters the ion introduction region 7 .
[0050] Apply voltage (generally 20-50V) to the first electrode in the ion introduction area 7 to accelerate the ions and send them to the quadrupole system 14. The quadrupole is in the mass selection mode, and only IrC 2 h 2 + The ions pass through and are sent into the ion trap. If the ion trap is analyzed directly according to the work above, one obtains Figure 4 (a) IrC 2 h 2 + mass spectrum.
[0051] If the ions leave the quadrupole rod, a pulse voltage of -5V is applied to the front cover 10 of the ion trap, and an inert gas such as xeno...
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