Ultraviolet spectroscopy of HgAr in a supersonic jet: A new determination of the A 30+ state potential

1996 ◽  
Vol 104 (20) ◽  
pp. 7860-7865 ◽  
Author(s):  
S. J. Lawrence ◽  
D. N. Stacey ◽  
I. M. Bell ◽  
K. Burnett
Keyword(s):  
Supersonic Jet ◽  
Ultraviolet Spectroscopy ◽  
State Potential

scholarly journals Ultraviolet spectroscopy of pressurized and supercritical carbon dioxide

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Timothy W. Marin ◽  
Ireneusz Janik
Keyword(s):  
Carbon Dioxide ◽  
Potential Energy Surfaces ◽  
Vacuum Ultraviolet ◽  
Electronic Absorption Spectra ◽  
Industrial Applications ◽  
Ultraviolet Spectroscopy ◽  
Collisional Broadening ◽  
Thermodynamic Critical Point ◽  
State Potential ◽  
Energy Surfaces

AbstractCarbon dioxide (CO2) is prevalent in planetary atmospheres and sees use in a variety of industrial applications. Despite its ubiquitous nature, its photochemistry remains poorly understood. In this work we explore the density dependence of pressurized and supercritical CO2 electronic absorption spectra by vacuum ultraviolet spectroscopy over the wavelength range 1455-2000 Å. We show that the lowest absorption band transition energy is unaffected by a density increase up to and beyond the thermodynamic critical point (137 bar, 308 K). However, the diffuse vibrational structure inherent to the spectrum gradually decreases in magnitude. This effect cannot be explained solely by collisional broadening and/or dimerization. We suggest that at high densities close proximity of neighboring CO2 molecules with a variety of orientations perturbs the multiple monomer electronic state potential energy surfaces, facilitating coupling between binding and dissociative states. We estimate a critical radius of ~4.1 Å necessary to cause such perturbations.

Ultraviolet spectroscopy of pyrene in a supersonic jet and in liquid helium droplets

2004 ◽  
Vol 120 (13) ◽  
pp. 6028-6034 ◽  
Author(s):  
Gaël Rouillé ◽  
Serge Krasnokutski ◽  
Friedrich Huisken ◽  
Thomas Henning ◽  
Oleksandr Sukhorukov ◽  
...  
Keyword(s):  
Liquid Helium ◽  
Supersonic Jet ◽  
Ultraviolet Spectroscopy ◽  
Helium Droplets

scholarly journals Rapid Determination of Aesculin, Aesculetin and Fraxetin inCortex FraxiniExtract Solutions Based on Ultraviolet Spectroscopy

2011 ◽  
Vol 8 (s1) ◽  
pp. S225-S236 ◽  
Author(s):  
Ming Yang ◽  
Jia-Lei Chen ◽  
Xiu-Feng Shi ◽  
Hui-Jue Niu
Keyword(s):  
Root Mean Square Error ◽  
Reference Data ◽  
Rapid Determination ◽  
Ultraviolet Spectroscopy ◽  
Mean Square ◽  
Chemical Parameters ◽  
Ultraviolet Spectra ◽  
Calibration Models ◽  
The Relationship

To evaluate the application of ultraviolet spectroscopy for the rapid determination of aesculin, aesculetin and fraxetin inCortex fraxiniextract solutions, ultraviolet spectra ofCortex fraxiniextract solutions from different batches were collected in the spectral range from 200 nm to 400 nm. The relationship between ultraviolet spectra and chemical parameters displayed some non-linear characteristics. Thus, K-OPLS was proposed to establish the calibration models for the determination ofCortex fraxiniextract solutions between the reference data and ultraviolet spectra. The calibration results were achieved for the determination ofCortex fraxiniextract solutions. The coefficients of determination in calibration (R2) for aesculin, aesculetin and fraxetin were 0.989, 0.957 and 0.939, while in prediction (R2) were 0.982, 0.979 and 0.962, respectively. And the root-mean-square error of prediction (RMSEP) for aesculin, aesculet and fraxetin were 11.99, 3.02 and 1.59 μg/mL. The results demonstrated that ultraviolet spectroscopy could be used for the rapid determination of these three components inCortex fraxiniextract solutions.

Ultraviolet Spectroscopy for the Analysis of Oil-In-Water Effluent Using Isopropanol as Co-Solvent

1997 ◽  
Vol 51 (3) ◽  
pp. 318-322 ◽  
Author(s):  
Trevor Bastow ◽  
William H. Durnie ◽  
Alan Jefferson ◽  
James Pang
Keyword(s):  
Petroleum Hydrocarbons ◽  
Homogeneous Solution ◽  
Direct Analysis ◽  
Ultraviolet Spectroscopy ◽  
Hydrocarbon Content ◽  
Oil In Water ◽  
Current Production ◽  
Oily Water ◽  
Clear Solution

Direct analysis of oily water effluents was investigated as a method for the determination of petroleum hydrocarbons in the discharge from primary oil production facilities. A co-solvent, isopropanol (2-propanol), was chosen that produced a clear, homogeneous solution when added to oil-in-water effluent. The clear solution was then analyzed directly for aromatic hydrocarbon content by using ultraviolet spectroscopy. The concentration of oil in the sample was calculated from a Lambert–Beer plot at 226 nm. The standard used was a sample of oil that best represented the oil that had contacted the water, i.e., current production crude oil.

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