Discharge ionization current detector

A discharge ionization current detector used for a gas chromatograph, comprising:

• a) a plasma generator configured to generate plasma;
• and
• b) an ion collecting section including:
• a bias electrode configured to generate an electric field that guides sample ions, which are ionized by light emitted by the plasma generated by the plasma generator, to an ion collecting electrode;
• the ion collecting electrode configured to collect the sample ions;
• and
• an insulating member arranged between the ion collecting electrode and the bias electrode and made of aluminum oxide or sapphire having a purity equal to or larger than 99.5%;
• wherein the ion collecting electrode, the insulating member, and the bias electrode are airtightly joined with a joining member,
• wherein a first joining surface that joins the ion collecting electrode, and a second joining surface that joins the bias electrode of the insulating member are plated with nickel (Ni) on which molybdenum (Mo) and manganese (Mn) are metallized, and
• wherein the insulating member and the ion collecting electrode are brazed on the first joining surface, and the insulating member and the bias electrode are brazed on the second joining surface.