摘要 |
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<SUP>-5 </SUP>Torr, the jet expansion is passed through a skimmer ( 12 ) to obtain a molecular beam (M) under a high vacuum of at least 10<SUP>-7 </SUP>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.
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