Vapor Pressure Isotope Effect near the Triple Point

1971 ◽  
Vol 55 (12) ◽  
pp. 5735-5741 ◽  
Author(s):  
M. Jeevanandam
Keyword(s):  
Vapor Pressure ◽  
Isotope Effect ◽  
Triple Point

Carbon‐13 vapor pressure isotope effect in CHF3

1978 ◽  
Vol 68 (7) ◽  
pp. 3279-3285 ◽  
Author(s):  
Lester Borodinsky ◽  
Henry J. Wieck ◽  
Darrell Mayfield ◽  
Takanobu Ishida
Keyword(s):  
Vapor Pressure ◽  
Isotope Effect

Hydrogen bonding and vapor pressure isotope effect of ethanethiol

1979 ◽  
Vol 57 (11) ◽  
pp. 1350-1353 ◽  
Author(s):  
Jerzy Szydlowski ◽  
Hans Wolff
Keyword(s):  
Hydrogen Bonding ◽  
Vapor Pressure ◽  
Isotope Effect ◽  
Inverse Effect ◽  
Apparent Decrease ◽  
Stretching Vibrations ◽  
Intermolecular Vibrations ◽  
Hydrogen Bonded

The vapor pressure ratios of ethanethiol and ethanethiol-d1 between 223 and 323 K can be represented by the relation[Formula: see text]The PD/PH vs. T curve increases initially and reaches a flat maximum at 293 K; at higher temperatures there is an apparent decrease. This behavior can be explained by the superposition of predominantly the normal effect of the intermolecular vibrations and the SH and SD torsion vibrations, and the inverse effect of the SH and SD stretching vibrations. Contrary to the value of 0.91 reported previously, PD/PH values of 1.002 to 1.008 confirm that for weakly hydrogen-bonded substances and their deuterium-bonded analogues a negligibly normal or a slightly inverse vapor pressure isotope effect should be observed.

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