Mass spectroscopy

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daviem
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#1
Report Thread starter 6 years ago
#1
I was given a question about mass spectroscopy earlier, but I don't really understand it. Any one got any help they could offer?
Thanks.


"What charge do the ions in a mass spectrometer have?".
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Infraspecies
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#2
Report 6 years ago
#2
*Spectrometry

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?
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Pigster
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#3
Report 6 years ago
#3
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.
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NineTailedFox
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#4
Report 6 years ago
#4
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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Rorschach II
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#5
Report 6 years ago
#5
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).

Use 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.
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Rorschach II
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#6
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#6
Tell me if it doesn't make sense.
(And anyone else quote me if you think it is wrong.)
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Delciate
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#7
Report 6 years ago
#7
Remember the acronym VIADD

Vaporisation
Ionisation (making them positive as electrons are taken off)
Acceleration
Deflection (with a magnetic field)
Detection

Those are the steps in chronological order.
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