Why the photoionized ions are asymmetrical?
In a time of flight (TOF) mass spectrum, the atoms and molecules are photoionized and accelerated to a micro channel plate. In our experimental setup and also others, it is found that the shape of ions are not symmetrical. See the graph below, it shows that the signal appears with a quick decrease and disappears with a gradual increase. Also, there is some ring in the tail.
I want to find a explaniation and a formula to fit the shape if possible. But have no idea.
Who can give me some suggestion?
Actually, this is not the shape of the ions, but of the signal. The most intense peak seems quite symmetrical, but it seems not to be resolved from the bump next to it. There is always a chance for so-called "artifact peaks" to appear, due to tuning (we've seen those in our Waters Synapt G2). I'm pretty sure this is what you see there. You have to play with the instrumental parameters or ask for support from the company.
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