In the context of ozone shielding of ultraviolet light, absorption cross section is the ability of a molecule to absorb a photon of a particular wavelength and polarization. Analogously, in the context of nuclear engineering, it refers to the probability of a particle (usually a neutron) being absorbed by a nucleus.

In Equation \ref{6.74}, the characteristic molecular quantity that describes the sample’s ability to absorb the light is \(\epsilon\), the molar decadic extinction coefficient, given in L mol-1 cm-1. With these units, we see that we can equate \(\epsilon\) with the cross section as \[\epsilon = \frac {N _ {A} \alpha} {2303} \label{6.76}\]

Measurement of absorption cross sections is, in principle, trivial. We need a light source, such as a lamp (UV), a cell to contain the molecule of interest, a spectral filter (such as a monochromator) and a detector that is sensitive and responds linearly to the frequency of radiation of interest:

What is the absorption cross section, how is it measured? How to convert it to the absorption coefficient (measured in cm −1 − 1)? The cross section σ σ is related to the absorption coefficient α α by: where N N is the number density of the scattering medium …

HITRAN Line strength is closely related to the cross section of a photon interacting with a molecule. The HITRAN unit of line strength of cm-1 /(molecules cm-2) is basically the integral of the absorbance over one line:

2018年2月15日 · In this paper, we calculated the extinction cross sections (σ ext) of small gold nanoparticles by dipole approximation method. And the molar attenuation coefficient (decadic molar extinction coefficient) of small gold nanoparticles was deduced based on the calculated extinction cross sections.

Absorption cross sections refer to the measure of a molecule's ability to absorb photons, usually given in units of cm^2 molecule^-1. It quantifies the extent to which light is absorbed by a molecule.

Absorption cross-section refers to the measure of the ability of a substance, such as H2O at 172 nm, to absorb radiation, leading to distinct concentration profiles and reaction rates based on concentrations, lifetimes, and diffusion in a given set of reactions.

The absorption cross section is a parameter for a single molecule and can be calculated from the absorption coefficient when the molar concentration is converted to the concentration...

2024年8月28日 · Molar Tooth Cross-Section. Exploring the cross-section of a molar tooth reveals a complex internal anatomy that supports its function: Dentin: Lies beneath the enamel and provides structure. Though softer than enamel, it is still very strong. Pulp Cavity: The heart of the tooth, containing nerves and blood vessels that provide nutrients and ...