| abstract |
A salt represented by the formula (a1): n nwherein Q 1 and Q 2 each independently represent a fluorine atom or a C1-C4 perfluoroalkyl group,n X 1 represents —CO—O—X a1 — or —CH 2 —O—X a2 — wherein X a1 and X a2 independently each represent a C1-C15 alkylene group and one or more —CH 2 — in the alkylene group can be replaced by —O— or —CO—, Y 1 represents a C3-C36 alicyclic hydrocarbon group or a C6-C24 aromatic hydrocarbon group, and the alicyclic hydrocarbon group and the aromatic hydrocarbon group can have one or more substituents, and one or more —CH 2 — in the alicyclic hydrocarbon group can be replaced by —O— or —CO—, and Z + represents an organic cation. |