I'm a 49 year old undergraduate student at UC Berkeley. I don't have a background in the sciences so have to work a little extra when it comes to filling in what I don't know... I really, really needed this lecture presented in exactly this way. Extremely engaging and beautifully organized. Thanks so much!
Thank you for your effort to explain such a difficult phenomena. And I have a question. Does the earth magnetic field has an effect on spin of the proton and so it is considered that protons are oriented naturally to magnetic north pole?
Thank you, for repeating yourself so I had time to mentally store the new information somewhere in my mind in such a way that I can understand it, process it, and retrieve it. In a classroom, I wouldn't be able to fall asleep, which is a normal process that happens when new information is stored, I can deal with verbal hammering as it created the interaction that keeps me alert during the start, middle, and end of the speech. So, although un-natural, I do find this method of teaching very effective for my way of learning. Thanks. That said, my understanding of resonance is some small force applied to an object that will respond to that frequency and begin to react due to this force and frequency. Thank you, I had no idea that resonance can effect; nor the effect be useful with either nuclear or magnetic methods.
Hi, great lecture! Could you also explain to me the role of population differences (Boltzmann distribution) in nmr signal? And how does FT-NMR work, how can we get all the frequencies in one pulse? ty :)
The fact that my dumb self is getting what nmr is with my poor English skills is awesome thank u sir it's a chance to have you on this platform explain complicated things to commoners like me 🙏
Thanks for your great videos. I have question. is the external magnetic field is stable or oscillatory wave? I confused when you explained procession concept, you used oscillatory external magnetic field. but later you show the external magnetic field as a positive upward (stable) vector. It is appreciated if you help me to understand it.
Seyedeh Samane hi, actually there is a mistake, I think! the magnetic field in uniform and along a single direction. The sinusoidal wave (that u got confused for magnetic field ) is a the representation of radio wave. To summarize, initially there is a magnetic field to orient the dipole moment along with the magnetic field and there is this radio wave of particular frequency used to bring about the chemical shift. hope I was clear!!
Thanks! I've been so busy with coursework this semester, but rest assured that I've been watching and up-voting as usual! :) This video resonated with me (pun intended) because my great uncle Steve was involved in NMR research as a physical chemist many decades ago.
Awesome video!. I have a question: how can a proton have infinite current loops while proton itself is single entity?. If the charges are producing such loops, does that mean each charged particle has its own loop?. Thanks
As far as I know, this part is actually wrong. The magnetic moment is a consequence of the proton spin (just like an electron spin) which is an inherent property of the proton, just like its charge.
You state that the magnetic moment of a proton is 2.8 times the Bohr magneton muB. Correct me if im wrong but shouldnt it be the nuclear magneton muN instead?
So when somebody gets an MRI done, looking for something wrong, they can see if something is where it shouldnt be because its chemical shift would be different than normal cells? Hope my question makes sense...
So the energies of a nucleus will split into a parallel and antiparallel direction. How exactly does that happen? Do you mean that some nuclei will be parallel and others will be antiparallel?
Everything is fine, but I have only one thing to concern about: *IF a "Spin up" nucleus torques less than a "Spin down" one, why they split with the same amount of transition Energy (instead of different proportions) from the same degenerate energy level?* Thanks for the explanation anyway 🤓🤙
Hi, I have a question regarding the magnetic dipole moment. If the current is negative, shouldn't it be moving clockwise for the magnetic dipole moment to point downwards? ...or am I wrong? Thank you for making these very useful and informative videos, by the way! :)
Hi! You're welcome :) In the lecture, since we are dealing with protons and protons have positive charge, we only looked at the positive current moving in a circular fashion. The right-hand rule, which is used to determine the direction of the magnetic dipole moment, is applied for positive current. If the current is negative and moving in the same direction, we can still apply the right hand rule but we have to switch the direction we obtain from the right hand rule at the end. So in this case, if the negative current was moving in the counterclockwise direction, we apply right hand rule and obtain the direction to be upward. BUT because it was negative, we have to switch the direction of the magnetic dipole moment, so that means it points downward. So to answer your question, a positive current moving counterclockwise points creates a magnetic dipole moment pointing upwards. A negative current moving counterclockwise creates a magnetic dipole moment which points downward. However, a negative current moving clockwise would in fact create a magnetic dipole moment pointing upward. Hope that helped.
Thanks so much for this video it was so helpful but please try to write this greek letter next to B more like that letter than like M :P My whole page was filled with Ms :P
Hi! Sorry if you were confused, let me try to clarify whats taking place. The proton is spinning and when we turn on the external (stationary) magnetic field, that external magnetic field tries to orient it along the direction of the magnetic field lines. Then we shoot an oscillating electromagnetic wave at the proton (on top of that stationary external magnetic field), and that is what flattens out the precession of the proton. I recommend watching my lecture on MRI (magnetic resonance imaging). Its an application of NMR and it can help you better understand that I was talking about.
You have made 2 mistakes 1. mag moment of p = 2.79 NM You have mentioned =2.79 BM which is wrong 2. Energy difference = mag moment x B after taking half spin into considered. Half + half =1, not 2 x mag monent x B.
I know man :) The point was that he is quite intense, it was a bad joke. Althou there is some crackling of the sound because he is so loud, that problem is not fixed by turning down the volume.
I'm a 49 year old undergraduate student at UC Berkeley. I don't have a background in the sciences so have to work a little extra when it comes to filling in what I don't know... I really, really needed this lecture presented in exactly this way. Extremely engaging and beautifully organized. Thanks so much!
The way u explained the LARMOR FRQUENCY exemplifies ur ability👌👌👌
I just wanted to thank you for the video - you explain things in a very phenomenal way - made it so easy to understand. thanks!
Thank you so much sir !! U just made my day !! By making radiophysics understandable
Thank you for this lecture, it has helped clear a few things up that I was unsure of in Medical Physics.
Thank you for your effort to explain such a difficult phenomena. And I have a question.
Does the earth magnetic field has an effect on spin of the proton and so it is considered that protons are oriented naturally to magnetic north pole?
Thank you, for repeating yourself so I had time to mentally store the new information somewhere in my mind in such a way that I can understand it, process it, and retrieve it.
In a classroom, I wouldn't be able to fall asleep, which is a normal process that happens when new information is stored, I can deal with verbal hammering as it created the
interaction that keeps me alert during the start, middle, and end of the speech. So, although un-natural, I do find this method of teaching very effective for my way of learning.
Thanks.
That said, my understanding of resonance is some small force applied to an object that will respond to that frequency and begin to react due to this force and frequency.
Thank you, I had no idea that resonance can effect; nor the effect be useful with either nuclear or magnetic methods.
A wise teacher like you can really help all students out there..!! hatzz off Sir..!!
Thanks for all your efforts, really helped me, simple and clear :)
Absolutely brilliant description of MRI. I actually understood every aspect.
wow, what a talent. thank you!
Excellent explanation in a well organized , simple way. Thanks a lot 👍🏻
Great lecture, thanks a lot!
Thanks for helping me understand what’s going on in my quantum class
Thanks, I admire your work
Thank you so much, great explanation as always
You're awesome my man! Much appreciated really!
I logged in specially to like your video and say thanks for the clear explanation :)
eautifully explained, the genius!
Feels like i'm in church.. good lecture
Haha I can see why you said that. 😂
Saviour
Wan to be a lecturer like u..confident n good at explanation!
Literally Best teacher I've ever seen...
Hi, great lecture! Could you also explain to me the role of population differences (Boltzmann distribution) in nmr signal? And how does FT-NMR work, how can we get all the frequencies in one pulse? ty :)
The fact that my dumb self is getting what nmr is with my poor English skills is awesome thank u sir it's a chance to have you on this platform explain complicated things to commoners like me 🙏
Many thanks! It was a really clear explanation
beautifully explained. thank you!😊
So I think I understand precession now! Thanks!
omg...i just subscribed to this channel just by only 1 video!
This is pure gold
Thank you so much Sir
there is no any CZcams channel as AK
You are great sir
It was very useful .. thanks
amazing video .. more than helpful
Very clear explanation. ....Superb👌👌👌
Thank you so much for this sir.
excellent explanation for beginners
U r my super hero..
Aamazing! Great help.. thanks!! :)
Perfect explanation! Thank you!
Thanks! Happy to hear it helped!
This was sooooo very helpful! Complicated subject, but totally makes sense now! Thank you!
Thanku, explained wonderfully
thank you!!
Excellent sir
Hihi nice video! But could you explain when the spin state is 1/2? Thanks in advance！
please enable Subtitles submission so that I can help you with translation
You have a really hot voice , good explaination !
God bless you
Subhan Allah wa bihamdihi , Subhan Allah Al 'Adim
Thanks for your great videos. I have question. is the external magnetic field is stable or oscillatory wave? I confused when you explained procession concept, you used oscillatory external magnetic field. but later you show the external magnetic field as a positive upward (stable) vector. It is appreciated if you help me to understand it.
Seyedeh Samane hi,
actually there is a mistake, I think!
the magnetic field in uniform and along a single direction.
The sinusoidal wave (that u got confused for magnetic field ) is a the representation of radio wave.
To summarize, initially there is a magnetic field to orient the dipole moment along with the magnetic field and there is this radio wave of particular frequency used to bring about the chemical shift.
hope I was clear!!
thanks a ton :)
VERY GOOD TEACHING. VERY USEFUL LECTURE.
I love u sir. ...great great help ......I wish I could ever talk to u...
Best scientific channel on the Internets!
haven't seen you post in a while, welcome back :)
Thanks! I've been so busy with coursework this semester, but rest assured that I've been watching and up-voting as usual! :)
This video resonated with me (pun intended) because my great uncle Steve was involved in NMR research as a physical chemist many decades ago.
Life saver
V. Good. Can you please upload something about 2D nmr?
Thank you sir. :)
good lecture
awesome mowesome
Awesome video!. I have a question: how can a proton have infinite current loops while proton itself is single entity?. If the charges are producing such loops, does that mean each charged particle has its own loop?. Thanks
As far as I know, this part is actually wrong. The magnetic moment is a consequence of the proton spin (just like an electron spin) which is an inherent property of the proton, just like its charge.
Sir... kindly explain the Nuclear Resonance Scattering (NRS)
What does frequency of the nucleus means?
Little bit shouty but very clear. thank you:)
What is the relevance of the Larmor frequency to NMR?
You state that the magnetic moment of a proton is 2.8 times the Bohr magneton muB. Correct me if im wrong but shouldnt it be the nuclear magneton muN instead?
Sir ,how to distinguish between benzene and naphthalene using NMR
Plzzz reply...
So when somebody gets an MRI done, looking for something wrong, they can see if something is where it shouldnt be because its chemical shift would be different than normal cells? Hope my question makes sense...
What is rf pulse ,is this combination of magnetic and electric field
super video!
bundeligafan thanks! :)
Please tell me which gas are used NMR
Is NMR the same as MRI?
nmr for for increased spontaneus termal fission??
Sir please upload more video of physics
Aaaaaaaaaaaaaaaaaaaaah thank yoooooou!!!!
So the energies of a nucleus will split into a parallel and antiparallel direction. How exactly does that happen? Do you mean that some nuclei will be parallel and others will be antiparallel?
Is this a physical split?
Ak sir
Everything is fine, but I have only one thing to concern about: *IF a "Spin up" nucleus torques less than a "Spin down" one, why they split with the same amount of transition Energy (instead of different proportions) from the same degenerate energy level?*
Thanks for the explanation anyway 🤓🤙
Hi, I have a question regarding the magnetic dipole moment. If the current is negative, shouldn't it be moving clockwise for the magnetic dipole moment to point downwards? ...or am I wrong? Thank you for making these very useful and informative videos, by the way! :)
Hi! You're welcome :)
In the lecture, since we are dealing with protons and protons have positive charge, we only looked at the positive current moving in a circular fashion. The right-hand rule, which is used to determine the direction of the magnetic dipole moment, is applied for positive current. If the current is negative and moving in the same direction, we can still apply the right hand rule but we have to switch the direction we obtain from the right hand rule at the end. So in this case, if the negative current was moving in the counterclockwise direction, we apply right hand rule and obtain the direction to be upward. BUT because it was negative, we have to switch the direction of the magnetic dipole moment, so that means it points downward. So to answer your question, a positive current moving counterclockwise points creates a magnetic dipole moment pointing upwards. A negative current moving counterclockwise creates a magnetic dipole moment which points downward. However, a negative current moving clockwise would in fact create a magnetic dipole moment pointing upward. Hope that helped.
Thanks! I get it now! :)
Thanks so much for this video it was so helpful but please try to write this greek letter next to B more like that letter than like M :P My whole page was filled with Ms :P
+Ola Radzio :-P
it's so good
but we want to explain in Arabic translator 😢.
youtube can translated in Arabic.
but i do not know how it can dot
sory sir mujay to kuch samaj nai a raha
Hi, the same question as blue sky.
Hi! Sorry if you were confused, let me try to clarify whats taking place. The proton is spinning and when we turn on the external (stationary) magnetic field, that external magnetic field tries to orient it along the direction of the magnetic field lines. Then we shoot an oscillating electromagnetic wave at the proton (on top of that stationary external magnetic field), and that is what flattens out the precession of the proton. I recommend watching my lecture on MRI (magnetic resonance imaging). Its an application of NMR and it can help you better understand that I was talking about.
Plz sir reply
You have made 2 mistakes
1. mag moment of p = 2.79 NM
You have mentioned =2.79 BM which is wrong
2. Energy difference = mag moment x B after taking half spin into considered. Half + half =1, not 2 x mag monent x B.
yes but... angular momentum does what? not clear, so bad.
if only you asked nicely.. have a nice day :-)
AK LECTURES sorry.. study frustration
You must spend so much time on Wikipedia.
its good but god i can hear you, stop shouting :)
Just a thought, but I think that turning your volume down would be easier.
I know man :)
The point was that he is quite intense, it was a bad joke.
Althou there is some crackling of the sound because he is so loud, that problem is not fixed by turning down the volume.
haha all good, I'm a bit stressed from study and snapped a bit. All the best :)
it’s a teaching technique. shouting will make you concentrate more!
Agree !
Remove the Dislike button from this video.