scholarly journals Fourier transform measurement of NO2 absorption cross-section in the visible range at room temperature

1996 ◽  
Vol 25 (3) ◽  
pp. 289-305 ◽  
Author(s):  
A. C. Vandaele ◽  
C. Hermans ◽  
P. C. Simon ◽  
M. Van Roozendael ◽  
J. M. Guilmot ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Room Temperature ◽  
Visible Range ◽  
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

scholarly journals Infrared Absorption Cross-Section Measurements for Nitrous Acid (HONO) at Room Temperature

2000 ◽  
Vol 104 (8) ◽  
pp. 1692-1699 ◽  
Author(s):  
William S. Barney ◽  
Lisa M. Wingen ◽  
Matthew J. Lakin ◽  
Theo Brauers ◽  
Jochen Stutz ◽  
...  
Keyword(s):  
Cross Section ◽  
Infrared Absorption ◽  
Absorption Cross Section ◽  
Nitrous Acid ◽  
Room Temperature ◽  
Absorption Cross

scholarly journals Infrared Absorption Cross-Section Measurements for Nitrous Acid (HONO) at Room Temperature

2001 ◽  
Vol 105 (16) ◽  
pp. 4166-4166 ◽  
Author(s):  
William S. Barney ◽  
Lisa M. Wingen ◽  
Matthew J. Lakin ◽  
Theo Brauers ◽  
Jochen Stutz ◽  
...  
Keyword(s):  
Cross Section ◽  
Infrared Absorption ◽  
Absorption Cross Section ◽  
Nitrous Acid ◽  
Room Temperature ◽  
Absorption Cross

Growth and Absorption Spectrum of Tm,Ho:BaY2F8 Crystal

2011 ◽  
Vol 335-336 ◽  
pp. 1025-1028 ◽  
Author(s):  
Fan Ming Zeng ◽  
Guang Tian Zou ◽  
Jing He Liu
Keyword(s):  
Absorption Spectrum ◽  
Single Crystal ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Room Temperature ◽  
Laser Crystal ◽  
Rotation Speed ◽  
Absorption Cross ◽  
Technical Parameters ◽  
Cell Parameters

The Tm,Ho:BaY2F8 single crystal was successfully grown by the Cz method. The optimal technical parameters obtained are as follows: the pulling rate is 0.5—0.6mm/h; the rotation speed is 5—7rpm; the cooling rate is 10°C/h. The result of XRD curve shows that as-grown Tm,Ho:BaY2F8 laser crystal belongs to the monoclynicsystem and space group I41/a, the cell parameters calculated are: a = 0.69829 nm, b = 1.0519 nm, c = 0.42644 nm, β=99.676°, Z=2. Absorption spectra of Tm,Ho:BaY2F8 laser crystal at room temperature were measured and analysed, the absorption cross-section at 781nm calculated are 7.66×10-21cm-2.

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.

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