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AssigneeSpectrospin AG
InventorsHanspeter Kellerhals, Martin Allemann
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In a procedure for recording ion-cyclotron resonance spectra or an apparatus for carrying out the procedure, gaseous ions of a sample substance in an ultrahigh vacuum are simultaneously exposed to a constant magnetic field B.sub.O and to a high frequency field which is perpendicular to it, with resonances being excited when the frequency of the alternating field corresponds to the rotational frequency of the ions which move on circular paths in the constant magnetic field. To produce gaseous ions of the sample substance, the latter is bombarded with additional gaseous, high-energy ions of a primary substance. The primary ions are produced in the measuring cell by means of an electron beam and excited to a high energy level by means of ion-cyclotron resonance (FIG. 2).
A procedure of recording ion-cyclotron resonance spectra in which gaseous ions of a sample substance are produced and, in an ultrahigh vacuum, are exposed to a homogeneous constant magnetic field and to an alternating electric field of a given frequency which is perpendicular to the magnetic field, with ions brought to resonance by the alternating field producing a test signal and, moreover, the gaseous ions (secondary ions) of the sample substance being produced by bombardment of the sample substance with additional gaseous high-energy ions (primary ions), characterized by the fact that the primary ions are also excited by ion-cyclotron resonance.
Apparatus for recording ion resonance spectra of a sample substance, said apparatus comprising:
Apparatus in accordance with claim 14, characterized by the fact that outside the measuring cell (30), an arrangement (62, 63) is provided for producing an electron beam (64) which is introduced into the measuring cell (30) through openings (60, 61) in such a way that its path runs at a preselected distance from the sample carrier (53).
Apparatus in accordance with claim 14, characterized by the fact that the measuring cell (30) has the shape of a circular cylinder, with four cylinder-barrel segment surfaces (31 through 34) provided, which are situated opposite each other in pairs to form a transmitter (31, 32) or a receiver (33, 34) and are DC-coupled to mass, and further, that two cover surfaces (35, 36), (which function) as ion traps are connected to a finite potential (.+-.U.sub.O).
In an ion-resonance spectra recording apparatus of the type in which gaseous secondary ions of a sample substance are produced by bombardment with high energy primary ions exposed in an ultrahigh vacuum to a homogeneous constant magnetic field and to an alternating electric field of a given frequency perpendicular to said magnetic field, said apparatus comprising:
Dependencies are inferred from the claim text.