Time of Flight Mass Spectrometry

[@Legenddeadman4ever]

This guy is classic. Instead of listening to my boring college tutor I just watch Chris. Get some good sleep in college though...

[@AlleryChemistry]

+Legenddeadman4ever Ha!! Thanks very much. Lectures can be a little flat, I remember some of my uni lectures, I NEARLY fell asleep in them! Kept awake as I had a set of exams to pass. Stick with it! Thanks for your support.

[@Legenddeadman4ever]

+A Level Chemistry Revision Videos by Allery Tutors Thanks for the vids man your they r really useful

[@jamesbarker9116]

Thanks to you, I now have a better understanding of TOFMS, thank you very much Chris. Please continue making these very helpful videos. They are proving to be an essential supplement to my A-level Chemistry studies.

[@AlleryChemistry]

+James Barker Thanks very much! Pleased they are helping so much! Plenty more vids on the way, keep posted! Please spread the word about these vids!

[@Cats-12f]

Clearest chemistry videos on KZbin 👍👏😻

[@AlleryChemistry]

+Amna Umar Thanks very much! I am pleased they are helping you.

[@evalawrence6001]

Thank you this was extremely useful especially as I missed the lesson when our teacher went through this

[@AlleryChemistry]

No problem! Have you just started A Level Chemistry?

[@evalawrence6001]

yeah

[@AlleryChemistry]

Hope you enjoy the course and get a decent grade.

[@heather1802]

Great video thanks, but they don’t all have the same speed: same kinetic energy, different speeds which is why the lighter ones reach the detector sooner.

[@moyosorefagbenro1918]

Yea he said constant speed so i think he meant each individual ion won't decelerate, not that they all travel at the same speed :)

[@MrDAWOOD12]

wouldn't the plates in the acceleration step be positively charged to accelerate the positively charged cations away from themselves? And if the plates are negatively charged, wouldn't the negative charge reduce the cations back to their atomic (not-charged) form? thanks

[@AxelRosenvinge]

Perfect and simple explanation! Thank you very much

[@aLi-jr8hx]

hi I am an A-level student chem and I’ve been told and I’ve searched that electrospray ionisation is when a proton is added to the molecule. Or is this video, possible to be used for the new 2017 spec. Thank you

[@user-bh9qg6yo5h]

IYANTGMF1 Jafri yes, you need to know about electron impact ionisation and electrospray ionisation - in electrospray the sample is dissolved in a volatile polar solution and forced through a needle which is connected to a high voltage power supply. The sample molecule M then gains a proton forming an MH+ ion. In electron impact the sample is bombarded by high energy electrons from an electron gun which ends up knocking an electron from the sample forming a +ve ion. AQA said on their website it's important to know the difference between the two as well.

[@nicholascairns1349]

Electrons are not "knocked out" of atoms or molecules in ESI (electrospray ionization), you are conflating this with EI (electron ionization) usually only done now in GC-MS. ESI is a much milder technique that forms protonated (pos ion) or deprotonated (neg ion) ions from liquid phases. It's not fully understood what the actual mechanism is yet but what we do know is very well explained in numerous KZbin videos within.

[@Kh4lilJiw4]

Great videos, would appreciate more! Thanks

[@AlleryChemistry]

+Khalil Jiwa Thanks very much! More on the way (and that includes my podcasts www.allerytutors.libsyn.com/), watch this space. Thanks for your support, it means a lot to me to think people are benefitting from them!

[@LaajChopra]

Thanks 💜🤗for this lecture...

[@salmanqureshi3361]

Hi very well explained- really useful thanks I was just wondering: could they ask a question which involves drawing this?

[@AlleryChemistry]

Possibly. More likely to label and explain the different parts though.

[@fatimasultan9063]

Thank you for the easy to understand explanation. :)

[@kiesharoy-johnson8166]

Thank you very much...this was very helpful 😁😁

[@AlleryChemistry]

You're welcome!

[@haroon4330]

have u got a video on how to calculate tof

[@carmila6940]

How do they all have the same speed if the lighter ones travel quicker ?

[@hajrabatt8296]

Is this for the AQA spec? I'm doing edexcel, do these videos apply to that spec too or do we not need to know this in that much detail?

[@AlleryChemistry]

Yes this is suitable for AQA. Not too sure about Edexcel. Will be splitting the video into categories for exam boards soon. Just taking a bit of time to organise.

[@CopperKettle]

Thank you! A good explanation!

[@AlleryChemistry]

You're welcome.

[@wanaismail2437]

why there is keyword for vaporization, is not the sample in solid phase

[@hussainrasiwala3728]

they will have same speed or energy?

[@mahekjuyal4389]

Great efforts

[@AlleryChemistry]

Thanks a lot

[@bharathks5394]

Very informative. I have one query when we inject the sample into GCMS, in what form the sample will reach to MS. Because it should go to GC first know? Is there any divider to split the sample into GC and MS, separately? Thanks in advance for your response.

[@AlleryChemistry]

Yes it will be in the vapourised form. The sample will have different retention times going through the GC. As soon as they leave GC they enter MS.

[@Ewan0710]

Damn, thanks Quais, this helps >_>

[@issobeesaw1705]

Thanks very helpfull

[@yavarnasrinivas]

Tq so much❤️

[@AlleryChemistry]

Welcome 😊

[@gayatrinakar5049]

you look like murr from impractical jokers

[@TrueDAN]

ty so much!

[@AlleryChemistry]

+TrueDAN No problem! Please help by spreading the word.

[@keanukader3708]

ian hawke is that u

[@sina1234m]

thx