I was given a question about mass spectroscopy earlier, but I don't really understand it. Any one got any help they could offer?
"What charge do the ions in a mass spectrometer have?".
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- Thread Starter
- 14-09-2015 23:19
- 14-09-2015 23:50
As for the charge; you can figure it out for yourself. What is on the horizontal axis on the spectrum, and what do the numbers mean?
- 15-09-2015 07:09
What level are you? A-level, is my guess.
Which exam board? I'm not sure, following the change in specs. but I'll bet they are all the same and I'll bet it'll say what the only charge you'll get in Qs on the spec.
- 15-09-2015 08:49
Isnt it always positive?
Dont they get bombarded with high energy electrons causing electrons to get knocked off forming positive ions.
Edexcel as answer that has been burnt into my brain
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- 15-09-2015 08:55
They are ionised.
Then the plates w/ a negative potential accelerate them
then the electromagnets deflect them, the extent of which depends upon their mass to charge ratio (m/z).
edit: as it's electrons blasted at them, which rips off electrons, it would be a positive charge.
Imagine +1, that means there's one more proton than electron.
Imagine -1, that means there's one more electron than proton.
Hence a gain of electrons means it has been reduced, as the no. has gone from 0 to -1.
But only the "Imagine +1, that means there's one more proton than electron." is relevant here, as the loss of electrons has caused this.Last edited by Rorschach II; 15-09-2015 at 08:59.
- 15-09-2015 08:59
Tell me if it doesn't make sense.
(And anyone else quote me if you think it is wrong.)
- 15-09-2015 09:05
Remember the acronym VIADD
Ionisation (making them positive as electrons are taken off)
Deflection (with a magnetic field)
Those are the steps in chronological order.Last edited by Delciate; 15-09-2015 at 09:06.