Selection Rules for Electron Transitions

[@user-pi2nl6iu2n]

This second year studying molecular structure and energy levels would like to thank you eternally. Things are so much clearer now than just using Atkins' alone.

[@AKLECTURES]

Rory Marrast Thats awesome! glad to help! :-)

[@이수현-q1f9i]

I'm Korean and my listening skill is not much better but I understood all about these contents of lecture. Thank you for your amazing lecture!

[@SBk408]

You are the best teacher i have ever seen. Thank you so much

[@owlredshift]

First video I've seen of yours. You might be literally the best teacher I've ever witnessed in 35 years, and I don't even know what you did that was special

[@MMBBRR]

This guy is basically earning my degree for me

[@keshwimalsena8621]

Accent & facts are very clear. Thank you sir🤗

[@keshwimalsena8621]

And could you plz explain that how laporte forbidden transitions can happen. Ex:how deviation from centrosymmetry happens.what is dp mixing&what is meant by assymetric vibrations destroy center of symmetry

[@TheBodyferr]

i've just started watching some of your videos. they're amazing ! so clear and the presentation goes at a very well chosen pace.

[@harshvardhanpatil2243]

Thank you AK, explained the concept amazingly. Thank you for your videos. 👍

[@nachammalj1037]

To the point and precise. Thank You.

[@mrnarason]

Studying for modern physics exam, super helpful!

[@WayOfTheDuck]

same

[@shartkins]

@@WayOfTheDuck same

[@WayOfTheDuck]

@@shartkins overall this was probably the most helpful channel that semester. Good luck!

[@danielblanco2556]

Thank you very much for your clear and smooth explanation!

[@capriprice6642]

Such a good presentation!

[@ayaadel885]

u are amazing, Ur presentation is very simple and clear really thank u.

[@Edin12n]

Very clear explanation. Thankyou

[@abhinabasaikia6377]

Very clearly understood ..wow good teaching

[@JorgeRodriguez-it8pr]

great video to remember the basics of Quantum Mechanics!

[@shikhasmita7820]

Your explanation is just awesome...

[@Riyasharma.673]

Nice video ❤

[@RsGhost1]

m = 1 is not equivalent to the px orbital. px, and py are linear combinations of m = +-1..

[@dwarika6577]

well explanation thnq u sir🇮🇳🇮🇳

[@kennedn]

This was a good video but please for the love of god turn the gain down on your mic.

[@fatenadel2611]

Good jop really, I was confused about this rules before see your lecture, thanks

[@abcdef2069]

reason for dL = + 1 or - 1, d S =0 is a photon only has two intrinsic quantum numbers, that is, the photon's spin angular momentum 1 or -1 (Raman's discovery) when wave function Y( L =1) transitions to Y( L =0), where does the angular momentum go? it is carried away by a photon to conserve L, (dL/d t =0) even if e-'s spin wants to flip, but a photon doesnt have any more quantum number to accommdate. therefore a photon only sees an electric dipole field of an atom in general.

[@arifurrahmanfahat1372]

You explained it better than the teacher of University of Dhaka.

[@lilyjoh898]

I looked up the selection rules in so many websites, and finally figured it out! Thank you. really helpful.

[@wilberforcendarawit6705]

thanks for the assistance , i was hanged up by the concept of forbidden transition.

[@roshansah7872]

it's great....simply explained

[@yinghuang3781]

excellent super clear save my life

[@aidinmohammadizonoz3718]

Thank you very much From Iran 😘

[@wl200398]

Beautiful stuff man, thank you so much explained so well

[@Jarrod_C]

wish you would have explained a little bit on the why part, why and how did this become the rule, what is the intuition?

[@catherineharder]

Wow I actually understand now~ thanks for the explanation

[@atherlone6223]

Really really helpful love u sir

[@navakoti727]

Very nice explaination sir

[@divyachaudhary7888]

nice and easy explainer 😊

[@Cristelle731]

I seriously love you! Thank you so much!

[@sajadahmad1858]

wow u made me understand ,,,great...sir

[@JK-tp6nh]

Question: What is dipole selections rules then? And how does it connect to transision dipole moment. When we talk about spin-transition, is a transition between two electronic transisition possible - I don't think so, but not sure. Can you make a video, where you explaine the vertical excitation energy, including why the frequency for absorption is larger then frequency energy for emission? And whay is meant by exication energy. Thanks for this video. This helped a lot.

[@Gsshalini]

Thank u sir for excelent information

[@ManinderSingh-bl9xe]

Means a lot sir 🙏

[@sadeghi73]

love u man ! you made calm my confused mind!

[@riczz4641]

i would really like to know where these selection rules come from....

[@AKLECTURES]

mathematics of quantum mechanics...long and tedious calculations showed physicists that certain transitions are highly unlikely and to help us determine which ones are likely and which ones are not, physicists came up with these rules to help us keep things straight. so in a way, these rules were born from the minds of some very intelligent people to help explain how nature works :-) ..

[@riczz4641]

AK LECTURES you know any reference books? I been looking into this lately and every book just takes it as a definition.... But I wanna know why.

[@AKLECTURES]

Edsson L. Hi, I edited the comment above. If you are looking for a mathematical explanation of why they decided on these transitions rules, you can probably find that information online. I should warn you though, you'll need a strong background in math :) I do not know any reference books off the top of my head, sorry.

[@riczz4641]

AK LECTURES yeah i was skeptical a simple mathematical explanation was behind this, anyway it helps me a lot to know these rules are kinda empirical so i better not tangle with em, thanks again really like your channel

[@AKLECTURES]

Edsson L. Thanks! Glad to hear that !

[@shoorvirprogramme]

I wanted to know about d-d forbidden and allowed transitions

[@priyaraghuvanshi638]

Helpful Thank You Very Much Sir

[@jashanpreetbrar3245]

Amazing 👌🙌👌

[@prabhakarjami590]

sir I have a doubt. which of following transitions are forbidden and give reason? 2P1/2. --------->2D3/2. 2P3/2. ---------->2D3/2. 2P1/2. ----------->2D5/2. 3D3. ------------>3F2.

[@theessentialist6813]

#AK LECTURES I don't understand why is at the drawing 2s: n=2,l=0 and ml=0, why is l=0 ? Shouldn't that be l=1 because of the rule l=n-1?

[@chaymaebelarbi4898]

I think that there’s a mistake over there ! 2s: n=1 (not 2 !!) so as you said Lirim l=n-1 which gives l=0

[@learngermanwithvanessa]

​@@chaymaebelarbi4898no, n=2 is correct because of the 2 in front of s, hence 2s. s is here the name of the shell with angular momentum L = 0 corresponds to shell s, angular momentum L=1 corresponds to shell p, and so on.

[@simonblue56]

Really helpful!

[@zethayn]

Many thanks!!!

[@northernskies86]

Thank U so much! I love your vids :)

[@manjupriya6574]

2s has two energy levels..for l=0 and l= 1 right?

[@xianqian3580]

thank you, very clear!

[@akay37]

Thank you

[@canopus4]

Beautiful! Clear! Candid ! Thank you so much!

[@nidhipareek1617]

thanks alot sir..👌

[@MrKoreneko]

help me a lot..thanks

[@wakeelnoonmai2350]

The problem with all these lectures is that no one tries to explain why selection rules are so . To derive these through mathematical equations is very easy but no one ever tries to explain physically, why there should be change in orbital quantum number by one only and not zero or more than one.

[@earlspencer7863]

There can be it's just that they are very low probability or require more complex interactions with electric or magnetic fields. As far as what happens physically, it's probably related to conservation of energy and momentum. Just as only discrete orbitals are allowed, energy added will produce certain transitions more than others. It may be analogous to adding energy to a vibrating string. The string will produce a standing wave of a certain frequency but it's possible that other frequencies may be generated with the same energy input.

[@Riddhanand]

What are superselection rules?

[@abdullahatallah9759]

THANK YOU! SO MUCH

[@shahzadkhan8545]

Thanks for those helping lectures of Q.M

[@ZxNaba]

Yang memiliki probabilitas tinggi untuk terjadi disebut yang diizinkan

[@hajeccarimbaloyi6640]

precise! I like it

[@AKLECTURES]

Thanks Karim! Glad you enjoyed it.

[@juniormilles3303]

Excuse me, would you know what radiative coupling is? Do you know where I can find information on this?

[@dasunumayangam.a.8318]

thank you sir!.it's being very helpful!

[@Lozantrack]

Doesn't the 2pz orbital generally have a ml value of zero?

[@rafiqulalam5348]

change in l can not be zero??

[@twilightselena4eva]

Great video! - struggling chem student haha

[@DilipYadav-de2ru]

Matrix selection rules

[@sasayantan]

Thanks!!!!

[@ALIALI-hi3yz]

nice

[@mace_in_your_face6230]

THANKS SO MUCH!

[@avral4148]

Thanks, perfect.

[@kashishjain4148]

Kashish 2819105

[@alexandriaviktor846]

can i marry him. so he can teach me everyday

[@ishaanshrivastava8671]

Bruh