hi, i may be wrong but at 3:20 i think that you made a mistake. in fact earlier in the video you say that only high m/z ions pass through the negative bars. you made a vice versa with high and low mass/charge ratio. please correct me if i'm wrong.
How do we decide its mass to charge ratio after ions come out of the last door of the Quadruple Mass Filter? By The way best video I have seen so far on this topic.
It might have been answered already in the video but I am still confused as to why the positive voltages act as a high pass filter and the negative voltages act as a low pass filter. Is it due to the masses themselves and the heavier masses just aren't affected?
If the ions crash into the poles, wouldn't that mean that the rods would be instantly covered with reduced and precipitated crap? So how is this prevented? Please help damsel in distress.
Hello and thank you for the question! Even in decent vacuum, any fresh surface (e.g. freshly cut with ion beam) gets covered with a mono-molecular layer in a matter of seconds (a few ions every now and then wouldn't make much difference). Also, the energy of the ions would likely not be very high so they would hardly cause any damage to the rods and even if the rods were slightly eroded over time or covered with a thin layer of "crap", then it shouldn't matter much when carrying out the experiments. However, if they get too dirty over time (it depends on the total hours of usage and the nature of substrates), then the rods can be cleaned easily with something that doesn't scratch the rods - try lint free paper. So I believe the best answer I can come up with is regular maintenance, depending on the application.
+Lev Rovinsky Haha SIMS is surely on my list but i havent gotten to it yet. Although if you are interested in ion methods then perhaps you will enjoy our recently published video about low-energy ion scattering spectroscopy (LEIS).
Nice video. But the sound is distracting.
Thank you for the great video! I didn't understand why we need AC voltage on the rods, when we apply dc voltages to the quadrupole rods.
hi, i may be wrong but at 3:20 i think that you made a mistake. in fact earlier in the video you say that only high m/z ions pass through the negative bars. you made a vice versa with high and low mass/charge ratio. please correct me if i'm wrong.
How do we decide its mass to charge ratio after ions come out of the last door of the Quadruple Mass Filter?
By The way best video I have seen so far on this topic.
Abhijeet Chauhan m/e= k*(v/(r^2)(f^2)
It might have been answered already in the video but I am still confused as to why the positive voltages act as a high pass filter and the negative voltages act as a low pass filter. Is it due to the masses themselves and the heavier masses just aren't affected?
I have the same question
Where does the frequence of oscilation come from?
The AC voltage has a frequency
thanks, great vid
Very helpful video! Thank you!
If the ions crash into the poles, wouldn't that mean that the rods would be instantly covered with reduced and precipitated crap? So how is this prevented? Please help damsel in distress.
Hello and thank you for the question! Even in decent vacuum, any fresh surface (e.g. freshly cut with ion beam) gets covered with a mono-molecular layer in a matter of seconds (a few ions every now and then wouldn't make much difference). Also, the energy of the ions would likely not be very high so they would hardly cause any damage to the rods and even if the rods were slightly eroded over time or covered with a thin layer of "crap", then it shouldn't matter much when carrying out the experiments. However, if they get too dirty over time (it depends on the total hours of usage and the nature of substrates), then the rods can be cleaned easily with something that doesn't scratch the rods - try lint free paper. So I believe the best answer I can come up with is regular maintenance, depending on the application.
okay, thank you for your answer!
thank you! very informative!
+Lev Rovinsky And thank you for watching =)
+Captain Corrosion I'm doin a work on SIMS and this is very helpful!
+Lev Rovinsky Haha SIMS is surely on my list but i havent gotten to it yet. Although if you are interested in ion methods then perhaps you will enjoy our recently published video about low-energy ion scattering spectroscopy (LEIS).
Well done!
Drop the music. It distracts from the information.
Thanks for the feedback! Sadly we cannot edit existing videos online.
Ya that's correct it's too distractive
Btw very helpful video. Thanks 🙏
The background music is irritating 😞
Pole paha!
please take the sound off
best
Good animation. A native English speaker would make it much better.
+Long Zhang His english is fine in my opinion :)
+kkt3289 Haha thanks!
藥師國考簽