Relative Intensity Measurements of Libs Emission Spectra of Alkali Halides and their Application to Elemental Analysis of Mineralogical Samples

2021 ◽  
Author(s):  
M. D. Duerst ◽  
R. W. Duerst
Keyword(s):  
Elemental Analysis ◽  
Relative Intensity ◽  
Emission Spectra ◽  
Alkali Halides ◽  
Intensity Measurements

Raman Addition Spectroscopy with a Rotating Cell

1975 ◽  
Vol 29 (5) ◽  
pp. 386-389 ◽  
Author(s):  
Arthur K. Covington ◽  
Jennifer M. Thain
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectra ◽  
Relative Intensity ◽  
Internal Standard ◽  
Laser Raman Spectroscopy ◽  
New Technique ◽  
Reference Substance ◽  
Laser Raman ◽  
Intensity Measurements ◽  
A New Technique

A new technique is described for obtaining quantitative relative intensity measurements, in the study of solution equilibria by laser-Raman spectroscopy, without the necessity for adding an internal standard to the sample. A rotating cylindrical double cell with separate compartments for sample and reference is used to superimpose the Raman spectra of sample and reference and hence avoid any uncertainties arising from the displacement of the equilibrium by reference substance addition.

Relative Intensity Measurements in Microwave Spectroscopy

1963 ◽  
Vol 34 (8) ◽  
pp. 901-907 ◽  
Author(s):  
Alan S. Esbitt ◽  
E. Bright Wilson
Keyword(s):  
Relative Intensity ◽  
Microwave Spectroscopy ◽  
Intensity Measurements

LFluorescent X-Ray Relative-Intensity Measurements

1972 ◽  
Vol 5 (4) ◽  
pp. 1587-1591 ◽  
Author(s):  
J. H. McCrary ◽  
L. V. Singman ◽  
L. H. Ziegler ◽  
L. D. Looney ◽  
C. M. Edmonds ◽  
...  
Keyword(s):  
Relative Intensity ◽  
X Ray ◽  
Intensity Measurements

Microwave Spectrum of Cyclohexene Sulfide

1973 ◽  
Vol 51 (4) ◽  
pp. 529-532 ◽  
Author(s):  
R. Kewley
Keyword(s):  
Excited States ◽  
Relative Intensity ◽  
Vibrational State ◽  
Heavy Atom ◽  
Microwave Spectrum ◽  
Cyclohexene Oxide ◽  
Rotational Constants ◽  
Ground Vibrational State ◽  
Intensity Measurements

The microwave spectrum of cyclohexene sulfide (7-thiabicycIo[4,1,0]heptane) has been investigated in the 26.5–40 GHz region. R-branch lines due to both a- and c-type transitions have been assigned for the ground vibrational state and for the first excited states of the ring bending and ring twisting modes. From relative intensity measurements the frequencies of these two modes are estimated as: vbend = 115 ± 20 cm−1 and vtwist = 200 ± 60 cm−1. The rotational constants for the ground vibrational state are (in MHz): A = 3512.086 ± 0.010, B = 2057.969 ± 0.003, and C = 1623.023 ± 0.003. These values are consistent with a twisted half chair structure for the heavy atom skeleton of cyclohexene sulfide, similar to that of cyclohexene oxide.

scholarly journals Trace elemental analysis of mitral valves by EDXRF

2008 ◽  
Vol 22 (1) ◽  
pp. 57-62 ◽  
Author(s):  
A. Ates ◽  
O. Simsek ◽  
B. Ertugral ◽  
M. Ertugrul
Keyword(s):  
Trace Elements ◽  
Mitral Valve ◽  
Elemental Analysis ◽  
Standard Addition ◽  
Valve Disease ◽  
X Rays ◽  
Mitral Valves ◽  
Intensity Measurements ◽  
Rheumatic Valve Disease ◽  
Trace Elemental

The elemental analysis of mitral valves from 12 patients with rheumatic mitral valve disease was performed using radioisotope excited energy dispersive X-ray fluorescence (EDXRF) technique. An annular 50 mCi55Fe radioactive source was used for excitation of characteristic K X-rays of the trace elements in the samples. A high resolution Si(Li) detector, which has a 160 eV full width at half maximum for 5.9 keV photons, was used for intensity measurements. Concentrations of the elements P, S, K and Cl in the mitral valve samples were determined by using standard addition method. Deficiencies or excesses of these trace elements cause the valves to run irregularly. Abnormal value of these elements may also result in rheumatic valve disease.

scholarly journals Beneficial Effect of Sugar Osmolytes on the Refolding of Guanidine Hydrochloride-Denatured Trehalose-6-phosphate Hydrolase fromBacillus licheniformis

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Jiau-Hua Chen ◽  
Meng-Chun Chi ◽  
Min-Guan Lin ◽  
Long-Liu Lin ◽  
Tzu-Fan Wang
Keyword(s):  
Secondary Structure ◽  
Beneficial Effect ◽  
Enzymatic Activity ◽  
Bacillus Licheniformis ◽  
Guanidine Hydrochloride ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Cd Spectra ◽  
Fluorescence Emission Spectra ◽  
Intensity Measurements

The influence of three sugar osmolytes on the refolding of guanidine hydrochloride- (GdnHCl-) denatured trehalose-6-phosphate hydrolase ofBacillus licheniformis(BlTreA) was studied by circular dichroism (CD) spectra, fluorescence emission spectra, and the recovery of enzymatic activity. These experimental results clearly indicated that sorbitol, sucrose, and trehalose at a concentration of 0.75 M improved the refolding yields of GdnHCl-denatured  BlTreA, probably due to the fact that these sugars favored the formation of tertiary architectures. Far-UV CD measurements demonstrated the ability of sugar osmolytes to shift the secondary structure of GdnHCl-denatured enzyme towards near-native conformations. ANS fluorescence intensity measurements revealed a reduction of exposed hydrophobic surfaces upon the treatment of denatured enzyme with sugar osmolytes. These observations suggest that sugar osmolytes possibly play a chaperone role in the refolding of chemically denaturedBlTreA.

Autoionization resonances and configuration-mixing in the emission spectra of Zn I and Cd I

1972 ◽  
Vol 331 (1585) ◽  
pp. 237-247 ◽  
Keyword(s):  
Cross Section ◽  
Capture Cross Section ◽  
Emission Spectra ◽  
Absolute Intensity ◽  
Ionization Probability ◽  
Capture Cross ◽  
Photometric Study ◽  
Intensity Measurements ◽  
Mixing Coefficients ◽  
Configuration Mixing

From new emission spectra of Cd I and Zn I the nsnp 1 P 0 -np 2 3 P 2 features have been identified in each case ( n = 4 for Zn and n = 5 for Cd). Absolute photometric study of the resonances has proved that they have the same half-widths as their shorter-wavelength companions nsnp 3 P 0 -np 2 3 P 2 . The measured auto-ionization probability for the Cd I 5p 2 3 P 2 level is 4.15 x 10 13 s -1 and for the Zn I 4p 2 3 P 2 level is 4.84 x 10 12 s -1 . From the absolute intensity measurements we have determined the configuration-mixing coefficients and, for Cd I, the capture cross-section for the 5sE(d) 1 D 2 continuum associated with the resonance at 310.7 nm.

scholarly journals Retrieval of tropospheric NO<sub>2</sub> using the MAX-DOAS method combined with relative intensity measurements for aerosol correction

2010 ◽  
Vol 3 (5) ◽  
pp. 1287-1305 ◽  
Author(s):  
T. Vlemmix ◽  
A. J. M. Piters ◽  
P. Stammes ◽  
P. Wang ◽  
P. F. Levelt
Keyword(s):  
Boundary Layer ◽  
Relative Intensity ◽  
Trace Gas ◽  
Optical Absorption Spectroscopy ◽  
Data Set ◽  
Intensity Measurements ◽  
Significant Difference ◽  
Tropospheric No2 ◽  
Retrieval Scheme ◽  
Sky Radiance

Abstract. Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) is a technique to measure trace gas amounts in the lower troposphere from ground-based scattered sunlight observations. MAX-DOAS observations are especially suitable for validation of tropospheric trace gas observations from satellite, since they have a representative range of several kilometers, both in the horizontal and in the vertical dimension. A two-step retrieval scheme is presented here, to derive aerosol corrected tropospheric NO2 columns from MAX-DOAS observations. In a first step, boundary layer aerosols, characterized in terms of aerosol optical thickness (AOT), are estimated from relative intensity observations, which are defined as the ratio of the sky radiance at elevation α and the sky radiance in the zenith. Relative intensity measurements have the advantage of a strong dependence on boundary layer AOT and almost no dependence on boundary layer height. In a second step, tropospheric NO2 columns are derived from differential slant columns, based on AOT-dependent air mass factors. This two-step retrieval scheme was applied to cloud free periods in a twelve month data set of observations in De Bilt, The Netherlands. In a comparison with AERONET (Cabauw site) a mean difference in AOT (AERONET minus MAX-DOAS) of −0.01±0.08 was found, and a correlation of 0.85. Tropospheric-NO2 columns were compared with OMI-satellite tropospheric NO2. For ground-based observations restricted to uncertainties below 10%, no significant difference was found, and a correlation of 0.88.

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