the practice of separating a signal by frequency (or sometimes energy or momentum) and analyzing the resulting spectrum.
1
vote
3answers
552 views
Franck Condon Principle and Born Oppenheimer approximation
My question here is purely fundamental. I am confused with the concept in Franck Condon (FC) principle and Born Oppenheimer (BO) approximation. The FC principle is in accordance with the BO ...
6
votes
2answers
721 views
Converting between brilliance, intensity, and flux
This one should be a bit of a softball, but I can't find it explicitly stated anywhere on the internet, and my basic unit analysis doesn't seem to work.
Suppose you have a beam of synchrotron ...
4
votes
1answer
294 views
Why can free lithium atoms not take part in an Auger process?
Shouldn't it be possible for an incoming photon to excite one of the 1s electrons to a 2p state (or one of even higher energy) and then for the excited electron to drop back to 1s and kick out the 2s ...
2
votes
1answer
95 views
Can one compute the vibrational spectrum of a bond by the Fourier transform of the dipole moment vector autocorrelation function $C_{\mu\mu}(t)$?
Is it true that one can calculate the vibrational spectrum of a bond by the Fourier transform of the dipole moment vector autocorrelation function $C_{\mu \mu}(t)$?
For example, suppose that I have ...
0
votes
1answer
52 views
Rutherford Scattering Spectra
I am using SimNRA to simulate the classical Rutherford Scattering. Playing around with it, I came across some spectra that I cannot explain...
First of all, if someone plots the spectrum of ...
0
votes
1answer
36 views
Micro channel plate detectors to detect neutral particles
Micro channel plate (MCP) detectors are used to detect photons, electrons or charged particles. But, how MCPs can be used to detect neutral particles? In ion traps, the neutral molecules (after ...
-1
votes
1answer
121 views
What is electron momentum density in solids and molecules?
Can someone kindly help me to know how can i get electron momentum density for one orbital like home?
what is the theory of electron momentum density? how can I derive electron momentum density from ...
2
votes
0answers
39 views
How large would the electric field need to be to split the mj -/+1 626.6 nm line of neon?
I am an undergraduate considering an extension on a quantum beats experiment with neon. The premise is to excite neon atoms coherently from a metastable 'ground' state into a superposition of excited ...
1
vote
0answers
48 views
How to absorb a characteristic line in a spectrum
I have an x-ray tube. When I see the spectrum, I notice the characteristic lines of the anode. What do I have to do if I want to absorb a characteristic line?
I have thought that I can add a filter. ...
1
vote
0answers
45 views
Correlation function in relaxation in NMR
I am new in this community, I am from a chemistry background. I want to know a detailed solution of a density matrix for a singlet state using the concept of spin lattice relaxation in NMR. I will ...
1
vote
0answers
115 views
Linewidth pressure broadening due to organic molecules
In relation to atmospheric spectroscopy and some other gaseous spectroscopy applications where organic molecules are present in the vapor, does anyone know of any papers or resources on pressure ...
0
votes
0answers
27 views
Photometric versus radiometric and spectral quantities
Are spectral quantities the same as photometric quantities?
How do you pass from a radiometric quantity $R$ to the correspondent spectral quantity $R_λ$
I've been ask to pass from Irradiance to ...
0
votes
0answers
32 views
Thermionic emission, delayed emission and predissociation
In molecular photodissociation, the thermionic emission, delayed emission and predissociation are the same? otherwise, what is the difference between them?
My question is not about the solids, but I ...
0
votes
0answers
135 views
Instrumentation how-to: Raman Spectroscopy on single molecules (TERS)
The last two decades have brought a tremendous progress in the high resolution visualisation of single molecules. The molecules reside on an atomically flat surface and the imaging technique used is ...
