Patent ID: 7652179

Claim:
A gas for plasma reaction comprising at least 99.9% by volume, based on the total amount of the gas for plasma reaction, a compound represented by the following formula (1): R 1 —C≡C—R 2 (1) wherein R 1 is fluorine, a perfluoroalkyl group having 1 to 3 carbon atoms or a perfluoroalkenyl group having 2 to 3 carbon atoms, R 2 is a perfluoroalkyl group having 1 to 4 carbon atoms, a perfluoroalkenyl group having 2 to 4 carbon atoms, or a perfluoroalkynyl group having 2 to 4 carbon atoms, provided that the number of total carbon atoms in the sum of R 1 and R 2 is 3 or 4, and R 1 and R 2 may be the same or different.