PURPOSE: To aim at dispensing with pre-treatment of samples and yet improving analyzing sensitivity, by setting up an ultraviolet-ray radiator part applying ultraviolet rays to a sample electrode, while making spark discharge possible between insulator samples and ionizing the surface of each sample.
CONSTITUTION: An ultraviolet-ray generator part 4 is located at the side of an ionization chamber 3 so as to spread out the radiating rays overall a sample 1. In addition, the ulatraviolet-ray generator part 4 is provided with a discharge chamber 5 and an intermediate chamber 6, and this discharge chamber 5 is provided with an inflow part 7 of gas for discharge and an exhaust port 7. To keep up the desired pressure inside the discharge cahmber 5, a needle valve 9 is installed in the inflow port 7. On the other hand, the intermediate chamber 6 is interconnected to the ionization chamber 3 via a circular slit 16 and the ultraviolet-ray generator part 4 is possible to be attached or detached at need, with the ionization chamber 3 and a flange 18. With this, if ultraviolet rays are radiated on the surface of each sample, atomic corpuscles nearby the surfaces are ionized so that pre-treatment of samples is no longer required and spark discharge can be achieved between electrodes.
KAWAZOE SHIGEYOSHI
KOYAMA SUSUMU
