Anomalous density dependence of the v1 band of carbon dioxide in pressure-induced absorption

1970 ◽  
Vol 48 (1) ◽  
pp. 95-98 ◽  
Author(s):  
L. Mannik ◽  
A. R. W. McKellar ◽  
N. Rich ◽  
J. C. Stryland
Keyword(s):  
Carbon Dioxide ◽  
Density Dependence ◽  
Density Variation ◽  
Linear Term ◽  
Density Region ◽  
Induced Absorption ◽  
Active Absorption ◽  
Anomalous Density ◽  
Density Expansion

The anomaly in the density variation of the integrated absorption of the pressure-induced v1 band of carbon dioxide is shown experimentally to be represented by a linear term in the density expansion of the intensity, which is important only in the lower density region (0–20 amagat). A calculation indicates that the linear term arises from the infrared-active absorption of the v1 band of C16O18O.

The ν1 Band of Carbon Dioxide in Pressure-Induced Absorption. II. Density and Temperature Dependence of the Intensity; Critical Phenomena

1972 ◽  
Vol 50 (12) ◽  
pp. 1355-1362 ◽  
Author(s):  
L. Mannik ◽  
J. C. Stryland
Keyword(s):  
Carbon Dioxide ◽  
Absorption Coefficient ◽  
Density Range ◽  
Induced Absorption ◽  
Lennard Jones ◽  
Molecular Potential ◽  
Band Profile ◽  
Gaseous Carbon Dioxide ◽  
Interaction Term ◽  
Path Lengths

The ν1 band of gaseous carbon dioxide has been studied in pressure-induced absorption at temperatures of ~ 190, ~ 300, and ~ 470 K, over a density range from 0.5 to 300 amagat, and with path lengths from 0.007 to 56 m. The observed temperature variation of the binary absorption coefficient can be satisfactorily accounted for only by adding a quadrupole–quadrupole interaction term to the usual Lennard–Jones model for the inter-molecular potential. The band profile is in agreement with the theory of quadrupole-induced absorption. There is some increase in the intensity of the band near the critical point due to the divergence of the correlation length. A very marked increase in the intensity is possibly prevented by the "cancellation effect".

scholarly journals Anomalous density dependence of structural relaxation time in water

2008 ◽  
Vol 88 (33-35) ◽  
pp. 4137-4142 ◽  
Author(s):  
F. Bencivenga ◽  
A. Cimatoribus ◽  
A. Gessini ◽  
M.G. Izzo ◽  
C. Masciovecchio
Keyword(s):  
Relaxation Time ◽  
Density Dependence ◽  
Structural Relaxation ◽  
Anomalous Density ◽  
Structural Relaxation Time

Density dependence of structure of supercritical carbon dioxide along an isotherm

1996 ◽  
Vol 105 (16) ◽  
pp. 7011-7021 ◽  
Author(s):  
Ryo Ishii ◽  
Susumu Okazaki ◽  
Isao Okada ◽  
Michihiro Furusaka ◽  
Noboru Watanabe ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Density Dependence ◽  
Supercritical Carbon

EFFECT OF HIGH PRESSURES ON THE INFRARED AND RED ATMOSPHERIC ABSORPTION BAND SYSTEMS OF OXYGEN

1963 ◽  
Vol 41 (12) ◽  
pp. 1991-2002 ◽  
Author(s):  
C. W. Cho ◽  
E. J. Allin ◽  
H. L. Welsh
Keyword(s):  
Absorption Band ◽  
Power Series ◽  
Absorption Coefficient ◽  
Magnetic Dipole ◽  
Total Pressure ◽  
High Pressures ◽  
Linear Term ◽  
Quadratic Term ◽  
Atmospheric Absorption ◽  
Induced Absorption

Absorption intensities in the 0–0 and 1–0 bands of the infrared [Formula: see text] and the 0–0 band of the red [Formula: see text] band systems of oxygen were measured in the pure gas in the range 50 to 150 atm and in O2–N2, O2–A, and O2–He mixtures up to 3000 atm total pressure at 25 °C. The integrated absorption coefficient of each band is expressed as a power series in ρO2 and ρf, the Amagat densities of oxygen and the foreign gas, respectively. The coefficient of the linear term AρO2 is a measure of the intrinsic (magnetic dipole) absorption of the O2 molecule; it is much greater in the red than in the infrared system. The quadratic term, BρO22, gives the induced absorption in O2–O2 pairs; B is about ten times greater in the infrared than in the red system. These results explain intensity anomalies which have been observed in condensed oxygen. Induction effects in O2–N2 and O2–A pairs are much smaller than in O2–O2 pairs, and scarcely observable in O2–He pairs. The significance of these results is discussed.

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