Collision Broadening of Rotational Absorption Lines. III. Broadening by Linear Molecules and Inert Gases and the Determination of Molecular Quadrupole Moments

1968 ◽  
Vol 49 (8) ◽  
pp. 3333-3343 ◽  
Author(s):  
Joseph S. Murphy ◽  
James E. Boggs
Keyword(s):  
Inert Gases ◽  
Absorption Lines ◽  
Quadrupole Moments ◽  
Linear Molecules ◽  
Collision Broadening

Zum Rotations-Zeeman-Effekt in Dimethylketen / Molecular Zeeman Effect and the Determination of the Molecular g Values, Paramagnetic Susceptibilities, and Molecular Quadrupole Moments in Dimethylketene

1972 ◽  
Vol 27 (4) ◽  
pp. 597-600 ◽  
Author(s):  
D. Sutter ◽  
L. Charpentier ◽  
H. Dreizler
Keyword(s):  
Magnetic Field ◽  
Zeeman Effect ◽  
Microwave Spectrum ◽  
Quadrupole Moments ◽  
Selection Rules ◽  
Rotational Transitions ◽  
The Magnetic Field

Abstract The rotational Zeeman-Effect in the microwave spectrum of dimethylketene was investigated at fieldstrengths close to 22 kG. Only ΔJ= 1 rotational transitions with ΔM = ± 1 selection rules did show appreciable splittings due to the magnetic field. From the splittings the diagonal elements of the molecular gr-tensor were determined to be: gaa = ∓ 0.020(3) ; gbb = ∓ 0.0165(8) ; gcc= + 0.0126(5). (Only the relative signs of the g-values are obtained from the experiment). The susceptibility anisotropics were found to be close to zero.

scholarly journals Determination of the OB Stellar Population of IZw18 on the Basis of its Hγ and Hδ Absorption lines

1999 ◽  
Vol 194 ◽  
pp. 444-447
Author(s):  
A. Sinanyan ◽  
D. Kunth ◽  
J. Lequeux ◽  
G. Comte ◽  
A. Petrosian
Keyword(s):  
Spectral Range ◽  
Stellar Population ◽  
Dwarf Galaxy ◽  
Absorption Lines ◽  
Spectroscopic Observations ◽  
Narrow Spectral Range ◽  
Blue Compact Dwarf Galaxy

On the basis of new spectroscopic observations of the blue compact dwarf galaxy IZw18 in the narrow spectral range between 4000Å and 4500Å absorption components of Hγ and Hδ lines were discovered. Equivalent widths of Hγ and Hδ lines have been measured. From available data the OB population of IZw18 was analyzed.

Determination of alveolar capillary temperature

1963 ◽  
Vol 18 (1) ◽  
pp. 107-113 ◽  
Author(s):  
A. W. T. Edwards ◽  
T. Velasquez ◽  
L. E. Farhi
Keyword(s):  
Technical Assistance ◽  
Regression Line ◽  
Direct Determination ◽  
Inert Gases ◽  
Arterial Blood ◽  
Pulmonary Capillary ◽  
Pulmonary Capillary Blood ◽  
Solubility Ratio ◽  
Capillary Temperature

Since the alveolar temperature influences the solubility of most inert gases in pulmonary capillary blood, knowledge of the solubility in arterial blood may be used to determine the equilibration temperature, i.e., alveolar temperature. Because the partial pressure of inert gas in arterial blood cannot be deduced from the alveolar pressure, direct determination of solubility is impractical. However, if a mixture of two inert gases is used, the ratio of partial pressures in the arterial blood is equal to that in the inspired gas and the ratio of gas contents will vary with the ratio of solubility. The blood solubility ratio He/A varies by 1.34% per degree centigrade. Using an O2-He-A inspired mixture, the following points were established in five resting subjects, fully clothed. 1) The pulmonary capillary temperature (Tpc) is linearly related to the rectal temperature (Tr), with a regression line equation: Tpc = 37.5 + 2.4 (Tr – 37.1). 2) When measurements were obtained on the same subject in different days, these measurements show that variations in Tpc are in the same direction as changes in Tr, but much more pronounced. Note: (With the Technical Assistance of M. Passke) Submitted on July 24, 1962

Effect of analyzer on determination of mixed venous PCO2 and cardiac output during exercise

1995 ◽  
Vol 79 (3) ◽  
pp. 1032-1038 ◽  
Author(s):  
L. Hornby ◽  
A. L. Coates ◽  
L. C. Lands
Keyword(s):  
Cardiac Output ◽  
Gas Mixture ◽  
Arterial Pco2 ◽  
Venous Pco2 ◽  
The Face ◽  
High O2 ◽  
Collision Broadening ◽  
Rebreathing Methods ◽  
Mixed Venous

Cardiac output (CO) during exercise can be determined noninvasively by using the indirect Fick CO2-rebreathing technique. CO2 measurements for this technique are usually performed with an infrared analyzer (IA) or mass spectrometer (MS). However, IA CO2 measurements are susceptible to underreading in the face of high O2 concentrations because of collision broadening. We compared an IA (Ametek model CD-3A) with a MS (Marquette model MGA-1100) to see the effect this would have on mixed venous PCO2 (PVCO2) and CO measurements. After calibration with room air and a gas mixture of 5% CO2–12% O2–83% N2, both devices were tested with three different gas mixtures of CO2 in O2. For each gas mixture, IA gave lower CO2 values than did the MS (4.1% CO2: IA, 3.85 +/- 0.01% and MS, 4.13 +/- 0.01%; 9.2% CO2: IA, 8.44 +/- 0.07% and MS, 9.19 +/- 0.01%; 13.8% CO2: IA, 12.57 +/- 0.15% and MS, 13.82 +/- 0.01%). Warming and humidifying the gases did not alter the results. The IA gave lower values than did the MS for eight other medical gases in lower concentrations of O2 (40–50%). Equilibrium and exponential rebreathing procedures were performed. Values determined by the IA were > 10% higher than those determined by the MS for both rebreathing methods. We conclude that all IAs must be checked for collision broadening if they are to be used in environments where the concentration of O2 is > 21%. If collision broadening is present, then either a special high O2-CO2 calibration curve must be constructed, or the IA should not be used for both arterial PCO2 and PVCO2 estimates because it may produce erroneously low PVCO2 values, with resultant overestimation of CO.

Resonance Broadening and Oscillator strength of the Mercury Absorption Line 1850 Å

1975 ◽  
Vol 30 (4) ◽  
pp. 445-450 ◽  
Author(s):  
D. Gebhard ◽  
W. Behmenburg
Keyword(s):  
Absorption Line ◽  
Oscillator Strength ◽  
Resonance Absorption ◽  
New Method ◽  
Absorption Lines ◽  
Resonance Transition ◽  
Resonance Transitions ◽  
Resonance Broadening

Abstract A new method for the determination of f-values of resonance transitions from wing-measurements of selfbroadened resonance absorption lines is described. The method is applied to the mercury resonance transition 61 S0→61P1, λ 1850 Å. The resulting f-value of 1.08±0.05 agrees well with those obtained from other methods.

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