Basics and principle of Raman Spectroscopy | Learn under 5 min | Stokes and Anti-Stokes | AI 09
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- Опубликовано: 1 окт 2024
- Analytical Instrumentation - Raman Spectroscopy
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One may have heard about Raman effect quite a lot of times. In this video we are going to discuss the concept of Raman scattering first. But we also need to understand Rayleigh scattering first. Once the phenomenon of Raman scattering is explained, this video will discuss why and how the Raman effect takes place and how Raman scattering is generated. The viewer will also learn about the stokes lines and anti-stokes lines and how Raman scattering is a two photon process. Finally, the use of Raman effect in spectroscopy is discussed. This will help to perform qualitative and quantitative analysis on the sample under test.
The Raman scattering takes place due to inelastic collision between photons and electrons. The difference in energy between incident photon and emitted photon generates Raman lines. Depending on the emitted frequency, the lines generated are called as Stokes lines if their frequency is less than incident frequency of photons, if the frequency of emitted photons is greater than incident frequency, it is called as Anti-stokes lines. From the Raman spectra, one can determine the molecule in the sample by studying the stokes and anti-stokes lines. Similarly, from their intensity one can calculate the concentration of a particular sample.
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Hi! could you tell me which program did you use to make the draws? Many thanks in advance and sorry to bluntly ask you that.
This is so much simpler and easier to understand than the 8-page instruction from my class. Thanks a ton!
Word
its not about electrons. The molecules have different vibrational levels. Raman scattering doesnt have enough energy to make electronic configuration shift. It just changes vibrational state of molecule. I guess.
Thanks - using RAMAN for my PHD and this was a great overview
me too :)
im stressing out of my head doing my last minute chemistry and this comic sans honestly calmed me down so much
Glad we could help :)
Nothing more than "Thank you". This is a very simple straight-to-the-point explanantion
Thanks Olumide Oni :) We are glad you liked the video.
This was so beautifully explained!
I learnt all this in my 1st year of Engineering and forgot about it since it was not used in my work. I had to know the basics again today and other videos I went through left me even more confused, until I stumbled upon yours. Saved me a ton of time I'd have spent going back to reference books.
Thanks a lot man! Musch appreciated
Glad we could help you Prabhav Shukla. Thanks a lot for your positive comments. Such feedback from our viewers motivates us to create and publish such more videos :)
Fantastic video. So concise and so clear. Explained better than most PhD professors could!
Man you explained so well than my Copycat Book and My teacher hats off to you 😊
nice video. Your explanation was quite thorough.
Thanks Charu Malik for such positive words. Glad you liked the video.
Enna ga
Your video is short, concise and misleading. Yes, you can explain the concept of stokes and anti-stokes with respect to electronic energy levels. But in raman spectroscopy, it is performed usually to observe the lattice vibrations in a sample. You missed out the part where you had to correlate the vibrational energy levels with phonon excitation which is the core of raman effect. Most people would keep your electronic excitation viewpoint if they dont look for more elaborate explanations. I do appreciate your video and we need more of it but it should be complete. All the very best for future works.
Thank you! Our backgrounds are not in pure sciences and we are interested in explaining the basics for better and easier understanding of the concepts.
Appreciate your inputs, we will try to improve in the future ones.
This explanation is good for Physical Chemistry students who are just beginning. The Raman effects are much more involved and an ocean by itself in science. For example to understand Raman effects in Solid state physics (crystalline amorphous and something in between) requires a deep knowledge in physics including Quantum mechanics and modelling of the Raman Spectra in complex situations to make sense of the experimentally observed Spectra.
Wow this was so useful!
Thank you very much! :D
So simple and didactic, just brilliant.
The inelastic process in Raman is a change in vibrational and/or rotational energy state of whole molecules. What is explained here sounds more like electronic excitations, like in florescence.
Your explanation don't tell in details but its easy to understand the basic principle or Raman Spectroscopy.
The main goal of the video was to explain the basics of Raman Spectroscopy :)
Suddenly I like instrumental analysis, thanks bro 👍⚘
I have just watched other film about Raman scattering and the guy said that the energy is not absorbed in Raman and electrons are NOT excited in Raman and this is the difference between Raman and fluorescence. So?
Straightforward and easy to understand. Thank you!
Raman spectroscopy explanation 0:51 sec
New subscriber 👍♥
Thank you very much for such good explanation . Great
Glad you liked our video Samira Mammadova.
You should really not say things like "electrons vibrate" or "vibrational level of electron" (instead of energy level) because that's super confusing. Electronic structure is its own separate thing, different from (molecular) vibration.
it was really good you should cover more of such topics especially of laser and spectroscopy.
at 2:50 you are saying the vibration level of 'electron' I think the whole discussion should be understood in terms of the vibrational or rotational state of the 'molecule'. please correct me if I am wrong.
Great explanation. Very helpful, thanks!
I type raman for the food got is 💀💀💀💀
You are the man! Thank you for this perfect video!
Now it is clear why and how raman effect it is ??
Thank You ❣️
I have been studying this topic in physics and I could understand it but you made it so simpler
We are glad you liked the explanation :)
Could you please share your material if you still have it?
thanks for making such a clear and concise video!
Thank you so much for your sharp teaching. It's really help a lot to me. Thank you again
please give some examples of raman data
dope. thanks fam
Thank you for explanation. But I have just two similar questions. Does the electron possesses different vibrational levels, or molecule? Does radiation impacts on molecule or electron?
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Thats why india is behind
To develop a country it need core to be developed
Electronics mechanical physics should be Prioritize .
Very simple to understand
Excellent video on the subject line with a very clear explanation and interesting schematics. Thank you and Keep doing such kind of useful tutorials.
Explanation is good n clear but I am thinking I would be more better than this video 🤗..... Don't mind...this is my opinion... clarification means all details is the most imp
Hello, I like your graphics. You can enhance the quality by talking slow and pronouncing key words clearly and discretely.
OMG! I became a fan of you just watching a single video. Very much simpler & very easier to understand. It's very attractive also ; I just amazed throughout the video! 😍
Thanks for your support and feedback :) We are glad you liked the video.
Isn't 1% probability of the occurrence of the Raman effect on the higher end of the spectrum?
3:00 when you are saying different frequency of emitted photons , so is it possible that , its frequency could be higher then incoming light ?
Similar to non linear optic
?
Exactly. However the extra/less energy is due to a change in vibrational state of the molecule
You are a good teacher! First time a lay man like me can understand Raman Spectrometry! Thanks.
wow dude your video saved me, thank you very much!!!!
We are glad we could help SoloTape
I can't imagine anyone else teaching in such a Simplified Way...👌 Thanks 🙏🙏🙏 sir
There are no electrons involved in that process! It‘s an interaction between photons and an optical branch of an crystal lattice. This explanation is missleading!
Nice explanation with understandable language
I find it very hard to understand your accent. I'm sorry I couldn't understand what you were saying...
It is amazing video 👍👍🙏
Thnq for this short video. plz keep uploading such videos, this saves time and is more useful than going through the texts.
Thanks Amiya R Mahapatra :) We will surely keep uploading such videos
The energy levels you mentioned in the video, are the vibration levels of molecules or electrons? And why is E2 lower than E, normally E strands for the ground state.
They are vibrational levels of molecules. This video has lots of errors, unfortunately. His use of E's is confusing. In his video, E2 should be the ground state, E as the 1st vibrational state, and E1 should be the 2nd vibrational state, all belonging to the ground state energy level.
@@davidmusoke Thank you, David! I agree, hope people are not misled.
At the 3:40 you are saying electron absorbs energy… but this is raman and molecules absorb energy…
Holy guacamole dude can you please explain the whole of physics like that?
Will try to...
Thank you so much sir 🙏 best explaination
can u explain to me about photons molecule interactions that gives rise to infrared and Raman
Nice Video Thakes
Very understanding within 5 min..
Thanks and do subscribe for more information 😎
why do both transmittance and absorption peaks appear in RAMAN spectra
very good explanation. keep it up.
You are amazing, please keep up the good work!
Thanks for sharing
sorry to say this, In Raman Spectroscopy we can do only Qualitative analysis but not Quantity...that's why the Raman spectroscopy is having more demand because of its accurate. First you study well and get enough knowledge to post a video because the people go through your video will get a wronge concept.
It is sad to see someone posting a comment without verifying the facts. We at practical ninjas take utmost care to check the technical aspects presented in the video before publishing it online. If you have any verified sources (technical publications, books, journals) that support your statements, please feel free to share with us. We would be more than happy to correct the mistakes and repost the video. But don't mislead people with your comments.
Can u please explain using example how concentration of sample can find
I have a comment: Why would you state that a photon is absorbed in case of Rayleigh Scattering? Rayleigh Scattering undoubtedly has dependency on the complex permittivity of a material but primarily it is change in the angle of photons due to Light Matter Interaction. If there was any absorption involved Rayleigh scattering wouldn't have lambda^4 power dependency. The Quantum Mechanical description of Rayleigh Scattering can be used to describe the transition between ground states and virtual states, but that is for the Hamiltonian of the Entire system and not just a single charge.
thanks for sharing such vedio
So, I went down a rabbit hile to find out why my violet laser makes chartreuse lines in a k9 crystal. Which I figured was a form of fluorescence; but wanted to make sure. Now my question is... Does this mean if I analyze the flouresced light with a spectrometer, I'm looking at the Raman scattering?
Can you please answer one question?
Predict the Raman scatter peak in water when excitation wavelength is:
a) 280nm
b) 355nm
Please 🙏
Wonderful video! Thank you for your explanation
We use this exact principle to check the etch rate on wafers.
Thanks a loooooooooot for doing this video
I was very much stressed out because I have to submit my project report by tomorrow and have to prepare it faster
Then I found this video that gave a very good understanding on the topic so that I can easily write it 🎉
Thanks🎉🎉
The animations are really good. But it sounds like you're reading out of a book and have no idea what you're talking about. Use your own words buddy.
Sorry I sound like an ass. But I really like the effort you have put on this. Keep it up!
Great video thanks
Thank u What are the calculations that we can calculate from the Raman?
peace out to you too, kind stranger!
guy...u gained one more subscriber! #silentkiller
Great video... Peace out buddy
Thank you from Brazil!
Raman effect is due to pure or impure gas.tell answer and reason
So how would u differentiate btw scattering and (absortion & emission) ??
Here According to you both are same?
Sir kisi kisi book me likha hota h ki scattering is not absorption it is reflection
Best video I have seen.well done
very great explanation :)
Thank you so much,great work ,I appreciate it from bottom of my heart ,love you 😊
This was incredibly helpful. Beautiful Explanation. Thank you so much
very useful > thank you
on Atomic Absorption Spectroscopy (AAS) Video is set to private on the link in the description.
What is this and why am i here
Thank you. Learning Raman for my undergrad project and this video was very useful
wonderful explanation
Can anyone give me an idea to calculate the Raleigh and Raman scattering in the PIV system?
Thank you very much! Greetings from Serbia.
Watching this as a revision for my test tomorow and i can confidently say that ive never had this topic explained to me so well before
Super
Thankyou so much.. this was really helpful...you made it so easy!
Tqqq so much sir.....
We are glad you liked the video :)
Fantastic, thank you. I am about to present on my channel how Raman spectroscopy will have us reinterpret the greenhouse atmosphere and this is useful background for me and others I hope. Raman spec. identifies N2 and O2's spectra, and their temperatures, and concentrations 4:13, and as a result I claim they too are greenhouse gases.
Sounds interesting Blair Macdonald. Instead of just understanding about the raman spectroscopy, it will be interesting for viewers to see how it can be applied and used for analysis. Thanks a lot for your comments and we are glad we could help. We will surely check your video once you publish it :)
this vdo is truely helpful ...thank you
thank you so much!!
Glad you liked the video!!!
Except the excitation occurs for a vibrational state, not an electron (I think). Thanks anyway.
The excitation occurs for electrons (molecules) and the energy levels are defined by either vibrational state, rotational state etc :)