scholarly journals The Continuous Radiative Absorption Cross Section of FeXIV and the Coronal Temperature

1954 ◽  
Vol 7 (1) ◽  
pp. 25 ◽  
Author(s):  
Alma Werner
Keyword(s):  
Wave Function ◽  
Matrix Element ◽  
Total Cross Section ◽  
Cross Section ◽  
Ground State ◽  
Absorption Cross Section ◽  
Absorption Cross ◽  
Coronal Temperature ◽  
The Matrix ◽  
Radiative Absorption

The continuous radiative absorption cross section of FeXIV was calculated, using a Hartree wave function to evaluate the matrix element for recombination to the ground state. This matrix element was considerably smaller than the value obtained by Hill (1950, 1951) using the hydrogen-like approximation, but the total cross section for recombination was not greatly different.

scholarly journals SCATTERING OF SCALAR FIELD BY AN EXTENDED BLACK HOLE IN F(R) GRAVITY

2014 ◽  
Vol 29 (02) ◽  
pp. 1450005 ◽  
Author(s):  
SANEESH SEBASTIAN ◽  
V. C. KURIAKOSE
Keyword(s):  
Black Hole ◽  
Wave Function ◽  
Scalar Field ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Hawking Temperature ◽  
Wkb Method ◽  
Absorption Cross ◽  
Tunneling Method

In this work we have studied the scattering of scalar field around an extended black hole in F(R) gravity using WKB method. We have obtained the wave function in different regions such as near the horizon region, away from horizon and far away from horizon and the absorption cross-section are calculated. We find that the absorption cross-section is inversely proportional to the cube of Hawking temperature. We have also evaluated the Hawking temperature of the black hole via tunneling method.

Radiative Absorption Cross Section of an Electron in the Field of an Argon Atom

1966 ◽  
Vol 141 (1) ◽  
pp. 41-44 ◽  
Author(s):  
M. Ashkin
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Argon Atom ◽  
Absorption Cross ◽  
Radiative Absorption

scholarly journals The Continuous Radiative Absorption Cross-Section of O-

1946 ◽  
Vol 106 (2) ◽  
pp. 128-129 ◽  
Author(s):  
D. R. Bates ◽  
H. S. W. Massey
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Absorption Cross ◽  
Radiative Absorption

The spectrum of Cr I between 179.8 and 200 nm wavelengths, absorption cross sections, and oscillator strengths

1975 ◽  
Vol 342 (1630) ◽  
pp. 431-438 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Ionization Potential ◽  
Cross Section ◽  
Cross Sections ◽  
Ground State ◽  
Absorption Cross Section ◽  
Column Density ◽  
Oscillator Strengths ◽  
Absorption Cross ◽  
Ionization Limit

The absorption spectrum of furnace-heated Cr vapour at wavelengths below 200 nm was recorded photoelectrically and by photography. By use of the hook method, the column density of neutral Cr atoms in the ground state was determined with the aid of the accurately known oscillator strengths of the resonance lines near 427 nm. The absorption cross section of the autoionized lines that dominate the ionization continuum could thus be obtained on an absolute scale. We also measured the wavelengths of many hitherto unreported lines near the ionization limit and derived a new value for the ionization potential, namely 54575.6 ± 0.3 cm -1 . Oscillator strengths for some of these lines are also given.

Fluorescence Imaging of Mitochondria in Living Cells Using a Novel Fluorene Derivative with a Large Two-Photon Absorption Cross-Section

2012 ◽  
Vol 13 (14) ◽  
pp. 2649-2654 ◽  
Author(s):  
Seiji Tani ◽  
Kenta Nakagawa ◽  
Takuya Honda ◽  
Hiromasa Saito ◽  
Yasutaka Suzuki ◽  
...  
Keyword(s):  
Fluorescence Imaging ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Living Cells ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Fluorene Derivative

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

scholarly journals Ultraviolet Absorption Cross-Sections of Ammonia at Elevated Temperatures for Nonintrusive Quantitative Detection in Combustion Environments

2021 ◽  
pp. 000370282199044
Author(s):  
Wubin Weng ◽  
Shen Li ◽  
Marcus Aldén ◽  
Zhongshan Li
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Absorption Cross Section ◽  
Elevated Temperatures ◽  
Uv Absorption ◽  
Energy Utilization ◽  
Quantitative Detection ◽  
Absorption Cross ◽  
Hot Gas

Ammonia (NH3) is regarded as an important nitrogen oxides (NOx) precursor and also as an effective reductant for NOx removal in energy utilization through combustion, and it has recently become an attractive non-carbon alternative fuel. To have a better understanding of thermochemical properties of NH3, accurate in situ detection of NH3 in high temperature environments is desirable. Ultraviolet (UV) absorption spectroscopy is a feasible technique. To achieve quantitative measurements, spectrally resolved UV absorption cross-sections of NH3 in hot gas environments at different temperatures from 295 K to 590 K were experimentally measured for the first time. Based on the experimental results, vibrational constants of NH3 were determined and used for the calculation of the absorption cross-section of NH3 at high temperatures above 590 K using the PGOPHER software. The investigated UV spectra covered the range of wavelengths from 190 nm to 230 nm, where spectral structures of the [Formula: see text] transition of NH3 in the umbrella bending mode, v2, were recognized. The absorption cross-section was found to decrease at higher temperatures. For example, the absorption cross-section peak of the (6, 0) vibrational band of NH3 decreases from ∼2 × 10−17 to ∼0.5 × 10−17 cm2/molecule with the increase of temperature from 295 K to 1570 K. Using the obtained absorption cross-section, in situ nonintrusive quantification of NH3 in different hot gas environments was achieved with a detection limit varying from below 10 parts per million (ppm) to around 200 ppm as temperature increased from 295 K to 1570 K. The quantitative measurement was applied to an experimental investigation of NH3 combustion process. The concentrations of NH3 and nitric oxide (NO) in the post flame zone of NH3–methane (CH4)–air premixed flames at different equivalence ratios were measured.

scholarly journals Coupling of Energy Into PCB Traces in a Reverberant Environment: Absorption Cross-section and Probability of Susceptibility

2020 ◽  
Author(s):  
Arunkumar H. Venkateshaiah ◽  
Haiyan Xie ◽  
John F. Dawson ◽  
Andrew C. Marvin ◽  
Linda Dawson ◽  
...  
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Absorption Cross ◽  
Reverberant Environment
Sign in / Sign up

Export Citation Format

Share Document