You are Here: Home

# Mass spec Watch

1. Can som1 please explain this to me. Much appreciated
Attached Images

2. (Original post by YsfAli)
Can som1 please explain this to me. Much appreciated
How does a mass spectrometer ionise the sample?
3. (Original post by samb1234)
How does a mass spectrometer ionise the sample?
high voltage is applied which causes particles to lose an electron which produces positively charged ions
4. (Original post by YsfAli)
high voltage is applied which causes particles to lose an electron which produces positively charged ions
What would happen if it produced a 2+ charge ion?
5. (Original post by YsfAli)
high voltage is applied which causes particles to lose an electron which produces positively charged ions
Not quite. There is a metal coil which is emitting high speed electrons, which can essentially 'knock off' electrons in the sample making positively charged ions. What could happen if more than one of the high speed electrons collided with the sample?
6. (Original post by charco)
What would happen if it produced a 2+ charge ion?
2 e- knocked off
7. (Original post by samb1234)
Not quite. There is a metal coil which is emitting high speed electrons, which can essentially 'knock off' electrons in the sample making positively charged ions. What could happen if more than one of the high speed electrons collided with the sample?
2 electrons would be knocked off
8. (Original post by YsfAli)
2 e- knocked off
yes, but what would happen to the ion in the MS
9. (Original post by YsfAli)
2 electrons would be knocked off
So if m/z is mass to charge ratio, how would this affect the m/z value
10. (Original post by samb1234)
So if m/z is mass to charge ratio, how would this affect the m/z value
lighter ions hit the detector first
11. (Original post by YsfAli)
lighter ions hit the detector first
If i had an ion of mass 100 and charge 2+, what would be the m/z value? how can we apply that to explain the question
12. (Original post by samb1234)
If i had an ion of mass 100 and charge 2+, what would be the m/z value? how can we apply that to explain the question
oh okay, so the 84kr isotope loses 2 electrons would produce the peak of 42kr?
13. (Original post by YsfAli)
oh okay, so the 84kr isotope loses 2 electrons would produce the peak of 42kr?
yes. Because the mass would be 84, the charge would be 2+ so m/z =84/2 =42
14. (Original post by samb1234)
yes. Because the mass would be 84, the charge would be 2+ so m/z =84/2 =42
thanks, dont know whats wrong with me today, most prob sleep deprived

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: May 21, 2016
Today on TSR

### What is the latest you've left an assignment

And actually passed?

### Simply having a wonderful Christmas time...

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.