Patent ID: 7589242

Claim:
A composition consisting essentially of a liquid alkane having an oxygen concentration less than 2 ppm, and an absorbance at 193 nm wavelength of 1 cm −1 or less wherein the liquid alkane is selected from: cyclopentane, cyclohexane, cycloheptane, n-decane, decahydronaphthalene racemate, cis-decahydronaphthalene, trans-decahydronaphthalene, exo-tetrahydrodicyclopentadiene, 1,1′-bicyclohexyl, 2-ethylnorbornane, n-dodecane, n-tetradecane, n-hexadecane, 2-methyl-pentane, 3-methyl pentane, 2,2-dimethyl butane, 2,3-dimethyl butane, octahydroindene, and mixtures thereof.