Absorption coefficient Definition and 22 Threads

##\alpha## is considered to be the absorption coefficient for a beam of light of maximum intensity ##I_0##. It's related to the complex part of the refractive index as we have shown above. Now, I have a doubt. Should I solve for ##k## from the quadratic equation in terms of the linear optical...

Why is the absorption coefficient (##\alpha##) of water is always given using the units ##\text{length}^{-1}##, while for other materials it is often given by ##\text{length}^{2}.\text{mass}^{-1}##? For instance, this paper uses ##cm^{-1}## for water and yet ##cm^2 / \mu g## for other...

Homework Statement I am conducting an experiment where I am interested in finding the absorption coefficient of different materials as muons pass through them. My data was all well until I realized more muons were measured AFTER they passed through one of the materials, which makes no sense...

Hi. I'm trying to model the attenuation (extinction) of a weak laser through a gas sample using the Beer-Lambert law. I've found that the attenuation cross section can be written as the sum of both a scattering and absorption cross section, however I'm having difficulty finding a source that...

hi every one can you tell me how to calculate the absorption coefficient of a thin film using the absorption and the transmittance spectrum plotted as a function of the wavelength (knowing that i don't know the thickness of the film )

Anyone can explain me this example? I substitute value for e = 1.602*10-19; m0 = 9.1*10-31; pi = 3.14; and calculated value for μav in matlab. I received 1.7104*10-19. But in exam this value is 0.68*10-25. What is i wrong? please help me. Thank you.

Hi All, I am designing an optical solid phantom to represent tissue optical properties (scattering and absorption coefficients). I know what should be the optical properties of tissue but I don't how much absorbing agent should I add to the mixture so that the phantom exhibit my desired...

The fact that energy in a laser can propagate without much loss over long distances is quite shocking ! It's a renowned fact that energy is dissipated when propagation takes place through any medium... (I'm fully aware that laser is an exception) But I have quite a difficult time understanding...

Hi, I have some modelling code that uses data from Hitran 2012 (https://www.cfa.harvard.edu/hitran/Download/HITRAN2012.pdf). I want to use some data from Lifbase but unfortunately the absorption coefficient units do not match. Lifbase units are given in m3 J-1 s-2 whereas Hitran units are...

I saw this on Wikipedia http://en.wikipedia.org/wiki/Electromagnetic_absorption_by_water Isnt it supposed to less than 1 ? maybe it has something to do with the unit ..why is it in m^-1?

I am looking for an exact value of absorption coefficient of aluminium for microwaves, but I can not find it in the internet. Anyone knows where I can find it?

I am currently trying to graph the absorption coefficient of Copper tetra-tert butyl phthlocyanine. I have the extinction coefficient vs wavelength graph and refraction vs wavelength graph however I don't know how to use these to graph absorption coefficient. E(eV)=1242.4/λ absorption...

we know that the quantum well absorption coefficient is calculated by summing over the electron-heavy hole and electron-light hole transitions: α_{w}(E) = \sum_{n}α_{e_{n}-hh_{n}}(E) + \sum_{n}α_{e_{n}-lh_{n}}(E) where n is the n^{th} transistion. but when the photon flux is incident...

Hi everyone Homework Statement I'm looking for the molar absorption coefficient of Catechol but I can't find it anywhere. Can anyone help me out? I searched the internet as well as some books we have in our library, but I wasn't able to find it. Thanks for you help.

I was conducting an experiment, and we had to use a radioactive source and a Geigor counter, in conjunction with aluminium plates. Using the data we produced we had to graph an absorption curve and obtain a value for the mass absorption coefficient of aluminium. Then we had to compare this...

Hello all, I come from musical sciences, but I'm trying to learn something about acoustics, so here I am, asking for some help about the impedance tube sound absorption coefficient test. I have and impedance tube, two microphones technique (ISO 10534-2), B&K microphones connected to the...

Hello, I am currently creating a program that calculates the change in observed intensity (nadir) from initial intensity within the atmosphere. As I am studying particular compounds, a first suggestion for my work is to produce a 'forward model' based on very simplistic radiative transfer...

How is the absorption coefficient per unit path length determined for excitation sites in a host crystal with an excitation site density of N and a bandgap of the excitation site equal to the photon energy? What I am trying to determine is how many photons will be absorbed for a given length.

Homework Statement Why is the mass absorption coefficient used rather than the linear absorption coefficient? Homework Equations mac=lac/density The Attempt at a Solution is it because mac is independent of physical from?

want to calculate absorption coefficient or absorption crosssection for 1% C2H2 gas Path length = 1meter Absorbene = 0.32 concentration = 8500ppm pressure = 1 atm Temperature = 25C I need to express this concentration to mol/cm3. Pls let me know if u have anyidea

Hi, is there a way to calculate the two-photon absorption coefficient of silicon? I am especially interested in the two-photon absorption coefficient of silicon for the wavelengths 1030nm, 515nm and 343nm. Thanks for any help!

Hi. I am new here! I'm doing a experiment on the absorption of beta radiation of aluminium and I need help! :redface: Does anyone know what the absorption coefficient of aluminium? Or at least where I can find it. Thanks in advance! o:) P.S. Sorry if I've posted in the wrong part of the forum...