Raman Definition and 90 Threads

Hello! I have the following situation: I have a 3 level system, with 2 ground states, call them ##g_1## and ##g_2## and an excited state, ##e##, with energies ##E_{g1}<E_{g2}## and ##E_e##. I have a driving field with frequency ##\omega## such that ##\Gamma \ll \Delta \ll E_{g2}-E_{g1} \ll E_e -...

Hello, I am quite interested in Raman spectroscopy. For the reason I would like to get deeper into it. So I searched some details about it, so I know, that each particle emits specific "rainbow" after it receives some amount of radiation from light in various wave lengths and similar situation...

Hi, I am looking for this paper in the study of Raman effect which has the following reference: Bir, G. L. & Pikus, G. E. 1961 Soviet Phys.-Solid State, 2, 2039. Can someone tell where I can find it? Thank you a lot for your help, TthePhysicist

I know that for the vibrational Raman spectrum, the energy levels are given by- E(n) = ℏω(n+1/2) - χℏω(n+1/2)^2 But I'm not getting what does it meant by the Raman lines are observed at given values of wavelengths and the fundamental vibrational frequency. I equated the E(0) with the energy...

I don't know whether it is an energy of a photon emitted by a deexciting molecule, or if it is an energy of laser's photons. Here is an example of such spectrum: For example, that value of wavenumber ##3000\, \mathrm {cm^{-1}}## is an energy of an emitted photon or a photon from laser? And that...

I'm reading this article about quantum entanglement, and the author writes about a process in a Raman transition which would break the entanglement, and I'm interested about how it breaks the entanglement. So the passage which I'm interested in begins with: "The answer is to do an operation...

I have read a paper states that "Stimulated Raman emission relies on damping of the phonon field that is much greater than for that of the optical Stokes field". But I cannot understand this, since all the materials I read do not state this. Can anyone explain it intuitively?

I have two doubts about the article Raman published in 1928 on Nature when he discovered Raman effect, precisely about these two sentences he wrote:1. What does it mean the modified scattering corresponds to their fluctuations in Compton effect? I think he's talking about the radiation...

What is the application of each of them?

Maybe we could use (1) uncertainty principle $\Delta E \Delta t = \hbar$ and get $\Delta E$ from the spetrum. Or (2) forced vibration model, then get the damping factor $\gamma$， and get $Delta t = frac{1}{\gamma}$

Hello everyone, I am attempting to make a Raman spectrometer which can double as a microscope. It uses a 532nm laser for excitation, an infinity-corrected microscope objective to collimate the light, a 200 lines/mm diffraction grating, and a confocal lens pinhole setup. A 5 megapixel camera ...

https://hackaday.io/project/1279-ramanpi-raman-spectrometer It's a pretty nifty gadget this Raspberry thingy. A computer the size of a pack of cigs. :) And a mass spectrometer... I'm not sure what such a device costs but I'm sure it pretty frigging expensive!

I have been unable to find any material pertaining to Raman prism. Does such a thing even exist?

if you filter completely the relaigh scattering, could a solar panel detect a raman signal?

Hi, I really need your help. Suppose I have a Raman spectra of a hydroxyapatite, how do I calculate the bond length from the spectra? I've been trying to understand the concept of Badger's rule but I really cannot understand. Please help.

Summary: How can I know the effects of ions on my coating using Raman and XPS? Hi! So I'm working on my thesis regarding surface morphology of Zn doped HAp coating. Now, my goal is to know the effects of Zn ions on the surface morphology of my coating using raman and xps. Jowever, I do not...

Raman spectroscopy involves Illuminating a target with a laser Beam. This produces Raleigh scattering. Does The releigh scattering have the same frequency as the laser beam? So use an optical filter to block the same frequency as the laser?

Can raman spectroscopy identify any substance or are there certain Substances raman spectroscopy cannot identify?

Hello everyone, I need some confirmation on something: As far as I understood, the raman spectroscopy measures the inelastic scattering of a photon in a medium through the absorption or the emission of a phonon in the medium. The energy and the momentum is conserved...

Hello, Recently I had a problem in the analysis of a raw material called Propranolol HCl, when performing Raman identification for the specific batch the obtained spectrum does not generate signal and, consequently, identity of the material. By testing other techniques like infrared and NMR, I...

I would like to know how to extract the instrumental broadening effect in Raman spectrometer using solid angle of the objectives, slit width or spectrometer length. I am calculation the FWHM in Raman peaks and I would like to know the effect of instrumental broadening on Raman line width and how...

I had learned that at the interface between 2 regions such as vacuum and a material, if there's an incident light from a region to another, the boundary conditions on the ##\vec E## and ##\vec B## fields at the interface are such that for them to hold at all times, the frequency of the incident...

Most of the commercial Raman spectrometer uses 785nm or IR laser as excitation source. Though we could use visible lasers like 532 nm in this place, which can reduce the overall cost of the device by 1. Using less power laser( since intensity of raman signal is inversly propotional to the 4th...

I want to design an experiment to demonstrate Raman - Nath effect. Due to limited resources at my hand (my school doesn't have too much resources), my condition is somewhat like Raman, and hence I want to do the original experiment that Raman and Nath conducted in IISc Bangalore back in the...

I do attach a plot (pdf and Matlab) of a recorded spectrum where I do not manage to find the gas specie overlapping CO2 Could you help me? Best Alain

Hi, The following is the typical raman spectra of water. In their normal form, water molecules maintain a simple configuration: an oxygen atom is in the center and two hydrogen atoms are on the two sides symmetrically. Under ambient conditions, water molecules within liquid water give rise to...

In the course of another thread I was lend to think about the Raman effect. I also read about the stimulated Raman effect and found that it is usually described as a third order nonlinear effect where a power of two of E is assumed to drive the nuclear vibration. I don't quite see why this is...

This may be a completely terrible question, but does someone have an idea on the detection capabilities for raman spectroscopy of a bulk sample like human tissue (hair, blood, skin, anything)? I thought it might be fun to see if it were possible to use raman to identify exposures to chemicals...

Hello! How are you? I am working in the photonics Lab in my university and I was wondering if has anyone ever tried to controll the horiba spectrometer T64000 with Labview. I know there is a way to do that with activx container. I was just wondering if that works. If it does, do you have any...

Homework Statement Sulfur hexafluoride is a centrosymmetric molecule with four infrared inactive vibrational modes: 346 cm-1 , 524 cm-1 , 643 cm-1 and 775 cm-1 The Raman spectrum of a liquid sample of SF6 (held at elevated pressures) was measured with a laser that has a centre frequency of...

Hi all, I am studying in Raman spectra and I don't know that what's means r^t a r =1. r^t is r transpose, r^t=(x,y,z). And a is diagonalized polarizability tensor. Whats means that is equal 1? Just normailzation? Help me,and so sorry my english is too bad...

Why do peaks of Stokes higher than peaks of anti-Stokes in graph of absorbance unit against wave number?

hello, I'm a Phd student my Phd subject is about surface enhanced spectroscopy (SERS). i need a reference for the Raman Shifts of metals (ex: Gold (colloid or film), titan tungesten..). Plz if anyone can help me. thank you in advance Nicolas

I am using a Renishaw inVia confocal microscope to study emission spectrum of molecules. The excitation wavelength of laser that I use is 532nm. However, I met with a very basic problem. When I use the same material (say plain silicon), and use different objectives (20X, 50X, 100X), then I will...

I am currently writing my Bachelorthesis about Raman spectroscopy. For measurement with a 785 nm Laser I plot the Intensity against the Raman shift. But for measurements involving a 532 nm, I had so select the program (Spectrasuite) so display them against the "normal" wavenumber. Why is that...

Why do we need the presence of an intense radiation in Inverse Raman Effect and Multi Photon Absorption?

Hi everyone, I'm little bit confuse about non destructive techniques such as XRD (X-ray Diffraction) and Raman spectroscopy, I know that both techniques can determine the crystal structure of the certain materials, and also, I know that XRD is working with the principle of emission of x-ray...

Hello! I apologise, if I put this problem into the wrong topic. I know that when the light is shined on the molecule it can get polarized. And because of that you can get Rayleigh and Raman scaterring. Also I know that only one photon over million or billion will scater as Raman. The...

Hello I understood what is the meaning of Raman scattering whether spontaneous or stimulated but I did not understand its importance in the optical fiber The amplification role is to compensate the loss on the fiber of the signal but how did we do it in the fiber !? Thank you

Hello. I'm reviewing background information on Raman scattering and I've noticed that the polarizability scales with v+1 for Stokes transitions and v for anti-Stokes. Why is this and what assumptions are used in the derivation? An explanation or pointing me to a good reference would be...

Hi! How can I tell, based on my Raman and X-Ray Diffraction studies, if a thin film is nanocrystalline or amorphous? The maximum thickness of my films is about 200nm, the XRay diffractograms showed nothing but the substrate (is it because of the thickness?), and my Raman spectra showed some...

What are the axes(horizontal & vertical axes) in a Raman spectrum?

Hi all, What is the relation between RAMAN Intensity and Energy of the photon and/or bond stregth and/or bond energy? Is there any equation or sth explain it easily? If you can explain it in a simple way, I will appreciate. Thanks

Has anyone read or seen any articles that might highlight the techniques of Stimulated Raman Scattering Spectroscopy? Or just any knowledge on the process they would be able to share? I am having a tough time getting a hold on the process and if anyone has any useful information or articles that...

Part 1: Homework Statement Use two coupled-wave equations for the Raman amplification process depicted to the right to show that for every photon at Stokes frequency omega_s created (destroyed) one photon in the laser pump field omega_L is destroyed (created). I have the coupled-wave...

Hello everyone! I´m new to the forum and to start participating and being part of it I have the following problem and question: I began using a dispersive Raman system and I got spectra of Rhodamine B and heparin sodium (and anticoagulant and glycosaminoglycan) in solid form and the spectra...

Hi Does anyone know how Raman signal can be used in optoelectronic device fabrication?

Dear friends I have a question regarding to polarized Raman spectroscopy. When we are talking about parallel and perpendicular electric field of the laser, is the magic angle 90° or 54.7°? I'd be grateful if you could answer me as soon as possible. Best wishes Kasra

Why we describe Raman modes At perticular wave number by E1 or A1,A2 or other If E1 say at 645cm-1, Why we cannot describe A1 at this wave number. How we write the representation at perticlar wave number. Please reply.

I have some raman data that I would like to prepare for inclusion in a report (and possibly publication in archival journal). The author guidelines for journals have not proven helpful in answering whether it is acceptable to perform data manipulations such as background subtraction. It has been...