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Patent Searching and Data


Title:
ION SOURCE OF MASS SPECTROMETER
Document Type and Number:
Japanese Patent JPH0554851
Kind Code:
A
Abstract:

PURPOSE: To feed stable sample ions to a mass spectrometer by constantly maintaining at a set value an electric field generated between a probe and a first pore without being affected by changes in the amount of samples flowing out of a liquid chromatograph.

CONSTITUTION: Voltages applied to a probe 4 and a first pore 6 are Va and Vb, respectively, and Va-Vb is calculated by an adjusting means 13. At the means 13 a setting signal voltage of a power source 5 for the probe is preset to a state in which a high electric field between the probe 4 and the pore 6 can continuously ionize samples. Therefore when the flow rate of the samples from a liquid chromatograph 1 to the probe 4 is varied the voltage Va is varied and the value of Va-Vb is also varied. However, since the means 13 is set at a voltage value at which the samples can be continuously ionized, the samples are stably ionized even with changes in the flow rate. Stable sample ions can thus be fed to a mass spectrometer.


Inventors:
UCHIDA MINORU
MATSUMURA KAZUMI
Application Number:
JP21185791A
Publication Date:
March 05, 1993
Filing Date:
August 23, 1991
Export Citation:
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Assignee:
HITACHI LTD
International Classes:
G01N27/62; G01N30/72; H01J49/10; (IPC1-7): G01N27/62; G01N30/72; H01J49/10
Attorney, Agent or Firm:
Yukihiko Takada