To provide an electro-spray ion source which ionizes a sample by emitting the sample from a nozzle by impressing voltage and a mass spectrometer, in which the voltage impressed is automatically adjusted to a specified value so that a liquid drop is not generated at the nozzle tip.
The mass spectrometer comprises a CCD camera with light receiving sensor which monitors the tip of an ESI chip and sends a signal to an air spray device when a liquid drop with an established radius or more is generated at the tip of the ESI chip, the air spray device which blows out the liquid drop by automatically spraying air when it receives a signal from the CCD camera with light receiving sensor. When the air spray device blows out the liquid drop, a signal is received and the voltage is automatically increased for an established portion and voltage increase is repeated until the liquid drop is no more generated.
COPYRIGHT: (C)2008,JPO&INPIT
WATANABE SUSUMU
HASHIMOTO MAKOTO
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