Chemical ionization source, the reagent gas is present in large excess compared to the analyte. Electrons entering the source with energy around 200-500 eV will preferentially ionize the reagent gas. Then, the ion/molecule reactions produces more stable reagent ions and the resultant collisions with other reagent gas molecules will create an ionization plasma. Positive and negative ions of the analyte are formed by reactions with this plasma. The following reactions are possible with methane as the reagent gas. If ammonia is the reagent gas, For isobutane as the reagent gas, Self chemical ionization is possible if the reagent ion is an ionized
Positive real numbers numbers. For a given positive real number "x", the sequence {"x"} of its integral powers has three different fates: When "x" ∈ (0, 1) the limit is zero and when "x" ∈ (1, ∞) the limit is infinity, while the sequence is constant for "x" = 1. The case "x" > 1 thus leads to an unbounded sequence. formula_10 and the multiplicative inverse function exchanges the intervals. The functions floor, formula_11, and excess, formula_12, have been used to describe an element formula_13 as a continued fraction formula_14 which is a sequence of integers obtained from the floor function after the