# Questions tagged [scattering]

Scattering is a general term for several physical processes in which radiation of some sort changes direction due to an interaction with a particle. Scattering can be classified by the type of radiation (ie, electromagnetic, x-ray, neutron), or by the relative sizes of the wave and the particle (ie, Rayleigh, Mie, geometric).

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### Why are Raman lidars and Rayleigh-Mie lidars operated at those specific wavelengths for aerosol study?

A study of several Atmospheric lidar stations around India shows that in order to study properties of aerosols, all Rayliegh-Mie lidars are operated at 532 nm, and Raman lidars are operated at 355, ...
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### Feynman diagrams for gravity

Feynman rules is the basic tool to compute amplitudes in perturbation theory for a QFT. Here, I am trying to understand perturbation theory in GR around the flat space metric, in terms of Feynman ...
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### Diagonal T matrix elements in Multi-scattering theory: Green's Function Approach

In Phys. Rev. B 41,1990 pp. 8139, Rehr and Albers utilize a separable Green's function to arrive at a simple expression for energy-dependent scattering amplitudes. I am not very knowledgeable in the ...
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### Why sky is blue? [closed]

The major factor of different scattering is the ratio of wavelength to the size of particles which are working as microscopic scattering mirrors. In a sparse particle medium like air, the longer the ...
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### Integral convergence in scattering problem

Consider the scattering of a particle by a central time-independent potential $V$, that is limited to a finite region in the space. the hamiltonian is $H = H_{0} + V$. Using the Moller operators, we ...
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### Maximum scattering angle for relativistic elastic collision

In Landau Classical theory of fields, in the section of elastic collision(chapter 2, section 13), he mentions that for $m_1>m_2$, the scattering angle $\theta_i$ cannot exceed a maximum value, and ...
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### A Question about In/Out States in Quantum Field Theory

When I was reading the lecture notes Advanced Quantum Field Theory by Jorge Crispim Romao, I accidentally found the following thing that I don't understand. On page 56, section 2.2, the author ...
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### Polarized structure functions and Bjorken sum rule

I'm trying to understand what the Bjorken sum rule and the polarized structure functions entering it are. I will use equation (2.3) here as a reference for asking the question. In Peskin, I've only ...
For an atomic form factor $F(\textbf q)$, the corresponding charge density distribution is given by $$\rho(\textbf r) = \frac{1}{(2\pi)^3}\int\text{d}^3 \textbf q \,F(\textbf q)\,\text{e}^{-\text{i}\... 1answer 54 views ### How do we see if light scatters in all directions? This may be a silly question, but I'm not sure how we see an object in front of us. If light hits the points of the object and scatters in all directions, how come we are able to form an image of the ... 0answers 56 views ### S-matrix branch cuts properties I'm trying to formally understand some non-perturbative results in scattering theory but the material available on the topic are not too friendly, so there are some very simple and essential facts I ... 1answer 17 views ### Why are number changing interactions inelastic? Inelastic processes are those in which the kinetic energy of the initial particles and final particles are not the same. Is this true also for number changing processes such as pair creation or pair ... 0answers 72 views ### Example of calculating phase shifts in scattering theory I have an extended question to this post: Phase shifts in scattering theory I have read it and also went over the formalism in Sakurai's, Shankar's, and Griffith's. I am now trying to look for ... 0answers 51 views ### Neutrino scattering cross-section in high energy limit I've come across a problem in out particle physics lecture notes that I have been unable to resolve on my own. I've paraphrased the bits of the notes that are giving me so much trouble: The notes ... 0answers 18 views ### How to evaluate the Feynman gauge photon propogator in coordinate space? In coordinate space the Feynman gauge looks like:$$\frac{g_{\mu\nu}}{\partial^2} . Without fourier transforming, how does this operator act on currents? In general for inverse derivative operators ...
Consider a step potential $V(x)$ where \begin{align} V(x) & = 0; \quad x\leq 0 \\ V(x) & = V_0; \quad x> 0 \end{align} Now consider the case where $E_0<V_0$. The solutions of the ...