Gas-phase chemical ionization of 4-alkyl-branched chain carboxylic acids and 3-methylindole using H3 O(+) , NO(+) , and O2(+) ions.

Gas-phase chemical ionization of 4-alkyl-branched chain carboxylic acids and 3-methylindole using H3 O(+) , NO(+) , and O2(+) ions.