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Using solution samples, the absolute infrared absorption intensities of five fundamental bands of CH2Cl2 were measured by an extrapolation technique and by approximate methods suggested by Ramsay. These determinations were used to test a classical relationship, proposed by Polo and Wilson, between corresponding liquid and vapor absorption band intensities. Qualitative agreement with published vapor intensity measurements was obtained.

Two of the infra-red bands of SiH4, originally measured by Steward and Nielsen, have been remeasured at much increased resolving power. In addition a new band near 13.0M has been located and measured. The bands have been identified as follows: their centers having been determined to be v%~930.9 cm -1 , v 3 ==2113.6 cm -1 , and v\ = 819.3 cm" 1 . From a rotational analysis of these bands the equilibrium value of B and the values of B for the vibration states v%, v%, and vi have been determined, B being h/8w 2 Ic. These have, respectively, the values B Q « 2.90 cm" 1 , B" * 2.87 cm" 1 , B'(v 2 ) = 2.96 cm" 1 , B'fa) = 2.79 cm" 1 . The values of f are found to be the following: £4= i -$*3 = 0.476. From the above data four independent relations existing between the generalized valence force constant are computed.

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