Topic
Absorption cross section
About: Absorption cross section is a research topic. Over the lifetime, 4495 publications have been published within this topic receiving 110333 citations. The topic is also known as: absorption cross-section.
Papers published on a yearly basis
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Papers
TL;DR: The optical properties of light-absorbing, carbonaceous substance often called "soot", "black carbon", or "carbon black" have been the subject of some debate as discussed by the authors.
Abstract: The optical properties of the light-absorbing, carbonaceous substance often called “soot,” “black carbon,” or “carbon black" have been the subject of some debate. These properties are necessary to model how aerosols affect climate, and our review is targeted specifically for that application. We recommend the term light-absorbing carbon to avoid conflict with operationally based definitions. Absorptive properties depend on molecular form, particularly the size of sp 2-bonded clusters. Freshly-generated particles should be represented as aggregates, and their absorption is like that of particles small relative to the wavelength. Previous compendia have yielded a wide range of values for both refractive indices and absorption cross section. The absorptive properties of light-absorbing carbon are not as variable as is commonly believed. Our tabulation suggests a mass-normalized absorption cross section of 7.5 ± 1.2 m2/g at 550 nm for uncoated particles. We recommend a narrow range of refractive indices for s...
2,940 citations
Book•
10 Jun 2002
TL;DR: In this paper, the basic theory of Electromagnetic Scattering, Absorption, and Emission was presented, and the T-matrix method and Lorenz-Mie theory were used to calculate and measure the scattering and absorption properties of small particles.
Abstract: Preface Acknowledgements Part I. Basic Theory of Electromagnetic Scattering, Absorption, and Emission: 1. Polarization characteristics of electromagnetic radiation 2. Scattering, absorption, and emission of electromagnetic radiation by an arbitrary finite particle 3. Scattering, absorption and emission by collections of independent particles 4. Scattering matrix and macroscopically isotropic and mirror-symmetric scattering media Part II. Calculation and Measurement of Scattering and Absorption Characteristics of Small Particles: 5. T-matrix method and Lorenz-Mie theory 6. Miscellaneous exact techniques 7. Approximations 8. Measurement techniques Part III. Scattering and Absorption Properties of Small Particles and Illustrative Applications: 9. Scattering and absorption properties of spherical particles 10. Scattering and absorption properties of nonspherical particles Appendices References Index.
2,461 citations
TL;DR: An effective absorption cross section per hydrogen atom has been calculated as a function of energy in the 0.03-10 keV range using the most recent atomic cross section and cosmic abundance data.
Abstract: An effective absorption cross section per hydrogen atom has been calculated as a function of energy in the 0.03-10 keV range using the most recent atomic cross section and cosmic abundance data. Coefficients of a piecewise polynomial fit to the numerical results are given to allow convenient application in automated calculations.
2,223 citations
27 Feb 1989
TL;DR: It is shown that if two upper levels of a four-level laser system are purely lifetime broadened, and decay to an identical continuum, then there will be an interference in the absorption profile of lower- level atoms, and that this interference is absent from the stimulated emission profile of the upper-level atoms.
Abstract: While it is commonly believed that population inversion is a requirement for obtaining laser amplification, this is not so. We show that if two upper levels of a four-level laser system are purely lifetime broadened and decay to an identical continuum, there will be interference in the absorption profile of lower level atoms, and this interference will be absent from the stimulated emission profile of the upper level atoms. It is, therefore, possible to have a substantial gain cross section at frequencies where the absorption cross section is zero and to obtain laser amplification in conditions where the lower level population greatly exceeds the upper level population.
1,319 citations
Abstract: Polynomial fit coefficients have been obtained for the energy dependences of the photoelectric absorption cross sections of 17 astrophysically important elements. These results allow the calculation of X-ray absorption in the energy range 0.03-10 keV in material with noncosmic abundances.
1,032 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2025 | 10 |
| 2024 | 14 |
| 2023 | 28 |
| 2022 | 114 |
| 2021 | 60 |
| 2020 | 98 |