Time of flight mass spectrometer calculations

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This video takes you through how to rearrange the formula for kinetic energy to give velocity, and then how to use this in conjunction with knowing the length of the flight tube in calculating time of flight (and all the other variations). I also show you how to calculate the mass of a single ion from the isotope's molar mass.

If you are mathematically minded and can show how the equations are derived, brilliant! You need to be able to do this in examination questions.

If you are, like me, mathematically challenged, then spend some time studying how one equation comes from another, and memorise it - it's far easier in the long run.

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Please click link (Google drive photo) for correction to Q1 - huge apologies! 😊

CrunchChemistry

revisiting this video the night before my chem paper 1

pickle_

Thanks I've been trying to understand TOF for ages my textbook has absolutely none of the calculations or even any of the formulas

anonymous-iuth

Hi, you should use unrounded values to calculate your answers and only round at the end because it effects the accuracy of your answer. With unrounded values aka accurate values I got 5.31*10^-6s

bilalhussain

Thank you so much! seriously the way you explain things really helped me understand. <3

elisaelakaradag

Hi, thanks for the video and I now fully understand TOF but, on the last question, could you explain to me how you were able to get a time of 5.23 x 10^-6 because I got 5.27 x 10^-, unless my answer as well is accepted?

itzbigdelly

Hello, great video this has really helped me understand TOF calculations, in the last question I got 5.314747263 x 10^-16, ( rounded it up to 5.3 however ), I think this is due to me not rounding the numbers up until the end so will there be a range the answers is in?

sophiedresner

Could you perhaps consider doing ionic equations?

mnbby

Can someone tell me how the mass calculation in the first question works

joseaelizabeth

in a MS where a tof question is 3 marks why is the mass used for 49Ti + not 49/6.022x1023 /1000 but its just 49. so the answer for question is much bigger than mine

chu

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