Radiant energy – Ion generation – Field ionization type
Patent
1997-05-20
1999-08-31
Anderson, Bruce C.
Radiant energy
Ion generation
Field ionization type
250287, B01D 5944, H01J 4900, H01J 4700
Patent
active
059456787
ABSTRACT:
A needle (22) adapted to advance and retract in z directions is accommodated in an ionization chamber (15), whereas an electrolytic solution (L) containing a sample is supplied into the ionization chamber (15) through a supply tube (18). The supply tube (18) is bored with a hole (20) communicating with the inside of the ionization chamber (15). While a predetermined voltage is applied between the supply tube (18) and the needle (22), the tip of the needle (22) is caused to come close to but not in contact with the electrolytic solution in the hole (20), so as to form a locally raised portion (Taylor cone) in the liquid surface of the electrolytic solution, thereby attaching a droplet containing ions in the electrolytic solution to the tip of the needle (22). After the needle (22) is moved to a predetermined position, N.sub.2 gas is jetted against the tip portion of the needle (22), thereby emitting the droplet containing ions attached to the tip of the needle (22) into the ionization chamber (15). Accordingly, the ions can be concentrated and subjected to soft ionization. Thus, an analysis apparatus for improving the ion generating efficiency to be used for mass spectrometry or the like is provided.
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Anderson Bruce C.
Hamamatsu Photonics K.K.
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