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AssigneeJapan Science and Technology Agency
InventorShun-ichi Ishiuchi
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A supercritical fluid jet generating device (1) wherein a pulse valve (5) is used to supersonic-jet a mixture of a supercritical fluid and a non-volatile sample or a mixture of a supercritical fluid and a pyrolytic sample and obtain a supersonic jet expansion, the supersonic jet expansion is introduced via a skimmer (8) into a differential evacuation chamber (10) under a high vacuum of at least 10−5 Torr, the jet expansion is passed through a skimmer (12) to obtain a molecular beam (M) under a high vacuum of at least 10−7 Torr, an intermolecular-collision-free sample molecule in the lowest energy level or the molecule aggregate ion of the sample molecule is obtained from the molecular beam (M) in a laser ionization chamber (13) by means of a resonance multi-photon ionizing method by a wavelength variable laser (L), and the ion is mass-analyzed. Thus, the lowest energy level data on a non-volatile or pyrolytic molecule or the molecule aggregate of that molecule and a thermally-unstable molecule or the molecule aggregate of that molecule or the like is obtained.
A method of generating a supersonic jet expansion, wherein a mixture of a supercritical fluid and a non-volatile sample or a mixture of a supercritical fluid and a pyrolytic sample is jetted into a high vacuum chamber of 10−7 Torr or more to generate a supersonic jet expansion of sample molecules in the lowest energy level without intermolecular collisions or molecular aggregates containing the sample molecules.
A mass spectrometry method using a supercritical fluid jet method, wherein a mixture of a supercritical fluid and a non-volatile sample or a mixture of a supercritical fluid and a pyrolytic sample is put under high vacuum of 10−7 Torr or more to generate a supersonic jet expansion of sample molecules in the lowest energy level without intermolecular collisions or molecular aggregates containing the sample molecules to obtain a molecular beam, ions of the sample molecules in the lowest energy level without intermolecular collisions or molecular aggregates containing the sample molecules are obtained from the molecular beam by performing a laser ionization method, and mass spectrometry is performed on the ions.
A mass spectrometry device using a supercritical fluid jet method comprising:
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