Need dielectric properties for some fluorinated organic gases

Does anyone know where to obtain dielectric constant information for some fluorinated organic gases. I am interested in data for RF and microwave frequencies (anywhere in the range 1MHz - 100GHz)but NOT optical range.

The specific compounds of interest are:
1.   CF4    tetrafluoromethane or carbon tetrafluoride)
2.   C2F4   tetrafluoroethylene
3.   C3F6   hexafluoropropylene

I am surprised that these are so hard to locate, especially CF4. I have checked the entire IEEE Microwave Theory and Tecniques archive with no luck. Google does not locate anything useful. I also tried the NIST website with no luck. References would be appreciated.

Thanks

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