PURPOSE: To simplify the mass-spectrum of a specimen and perform proper identification by previously ionizing gas molecules for ionization of the specimen, accelerating them to make bombardment of specimen molecules with them, and thereby ionizing the specimen molecules.
CONSTITUTION: Specimen molecules introduced to a specimen ionizing chamber 1 from a gas chromatograph G are ionized in a chamber 1, turned into an ion beam by a convergence lens 2, and left incident onto a mass-spectrographic part 3, and the ions having passed through this part 3 are sensed by an ion sensing part 4. At the side of the ionizing chamber 1, a gas ionization part (reaction gas) 5 is installed for ionization of the specimen, and the reaction gas ions produced there are accelerated by an accelerating electrode 6 and left incident to the ionizing chamber 1 to make bombardment to the specimen molecules for ionization thereof. Thereby the specimen molecules are free of intra-molecular transposition, and the produced fragment ions are ones produced with the specimen molecules severed simply, so that the mass-spectrum of the specimen is simplified to permit performing the identification properly.
YAMAMOTO YOSHITAKE
HIROOKA MEGUMI
