The evaluation of total absorption cross-section for photons in high density electron gas

1965 ◽  
Vol 3 (5) ◽  
pp. 402-421
Author(s):  
C. Thompson
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Electron Gas ◽  
High Density ◽  
Total Absorption ◽  
Absorption Cross

scholarly journals Effects of black carbon morphology on the brown carbon absorption estimation: from numerical aspects

2020 ◽  
Author(s):  
Jie Luo ◽  
Yongming Zhang ◽  
Qixing Zhang
Keyword(s):  
Fractal Dimension ◽  
Numerical Method ◽  
Black Carbon ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Accurate Estimation ◽  
Total Absorption ◽  
Absorption Cross ◽  
Brown Carbon ◽  
Carbon Absorption

Abstract. In this work, we developed a numerical method to investigate the effects of black carbon morphology on the estimation of brown carbon (BrC) absorption using the Absorption Ångström exponent (AAE) method. Pseudo measurements of the total absorption were generated based on several morphologically mixed black carbon (BC) models, then the BrC absorption was inferred based on different AAE methods. By comparing the estimated BrC absorption with True BrC absorption, we found that both AAE = 1 and Mie AAE methods do not provide accurate estimation for the BrC absorption, and the estimated BrC absorption can deviate several times from True BrC absorption. The newly proposed Wavelength Dependent AAE (WDA) method does not necessarily improve the estimations, sometimes it may even provide worse estimations than the AAE = 1 and Mie AAE methods. Fixing the fractal dimension to be 1.8, the deviation between the estimated BrC mass absorption cross-section (MAC) and True BrC MAC can reach approximately 9 m2/g, which is far more than brown carbon MAC itself. Therefore, the estimation of BrC absorption based on the AAE method should carefully consider the morphological effects of BC. Our findings highlight the BC morphological effects on the BrC absorption estimation.

Contribution of L Shell to the Total Absorption Cross Section in Aluminum

1969 ◽  
Vol 40 (7) ◽  
pp. 3046-3047 ◽  
Author(s):  
R. Haensel ◽  
B. Sonntag ◽  
C. Kunz ◽  
T. Sasaki
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Total Absorption ◽  
Absorption Cross

The Total Absorption Cross Section of 250-550 MeV Photons in Carbon, Aluminium and Copper

1974 ◽  
Vol 36 (5) ◽  
pp. 1499-1499
Author(s):  
Saburo Homma ◽  
Akifumi Itano ◽  
Kazuo Katsuura ◽  
Koichi Maruyama ◽  
Takashi Miyachi ◽  
...  
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Total Absorption ◽  
Absorption Cross

scholarly journals On the total absorption cross-section of galaxies - II: The case of λ cosmologies and covering factor variation

1998 ◽  
pp. 3-7
Author(s):  
M.M. Cirkovic ◽  
S. Samurovic
Keyword(s):  
Cosmological Constant ◽  
Cross Section ◽  
Cross Sections ◽  
Absorption Cross Section ◽  
Observational Cosmology ◽  
Total Absorption ◽  
Absorption Cross ◽  
Normal Galaxies ◽  
Previous Discussion ◽  
Inner Parts

In this work we expand the previous discussion of the plausibility of hypothesis of origin of the Ly? forest absorption systems in haloes of normal galaxies in connection with the HubbleDeepField (HDF) data. It is shown that simplistic approach to absorption cross-sections of galaxies with no luminosity scaling is in strong violation of empirical statistics up to redshift of z ? 3.5. Realistic variation of the covering factor in order to account for its increase in the inner parts of observed haloes leads to even bigger discrepancy. Cosmologies with finite cosmological constant are briefly discussed and compared to ? = 0 case. Ways to improve agreement with observational data are indicated. This problem is highly illustrative of the basic tenets of modern observational cosmology.

Total Absorption Cross Section of Atomic Oxygen below 910 Å

1965 ◽  
Vol 139 (5A) ◽  
pp. A1403-A1407 ◽  
Author(s):  
R. B. Cairns ◽  
James A. R. Samson
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Atomic Oxygen ◽  
Total Absorption ◽  
Absorption Cross

scholarly journals Photoelectric absorption cross section of silicon near the bandgap from room temperature to sub-Kelvin temperature

AIP Advances ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 025120
Author(s):  
C. Stanford ◽  
M. J. Wilson ◽  
B. Cabrera ◽  
M. Diamond ◽  
N. A. Kurinsky ◽  
...  
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Room Temperature ◽  
Absorption Cross ◽  
Photoelectric Absorption
Sign in / Sign up

Export Citation Format

Share Document