Patent ID: 7803511

Claim:
A positive resist composition for immersion exposure comprising: (A) a resin capable of increasing its solubility in an alkali developer by an action of an acid, (B) a compound capable of generating an acid upon irradiation with actinic ray or radiation, (C) a compound, other than compound (B), capable of generating an acid upon irradiation with actinic ray or radiation, and (D) a surfactant, wherein the acid generated by compound (B) satisfies conditions of V≧230 and V/S≦0.93 taking van der Waals volume of the acid as V (Å 3 ), and van der Waals surface area of the acid as S (Å 2 ) wherein the compound (B) is a sulfonium salt compound having an anion represented by formula (Y): in formula (Y), n 3 represents an integer of from 3 to 6 and n 4 represents an integer of from 3 to 6.