| 摘要 |
<p>The discharge space (3: is closed at the cathode end by an electrically conducting disc (8) at cathode potential. A toroidal permanent magnet (32) magnetised axially is used to produce the magnetic field that increase light intensity. A controllable electromagnet is coaxial with the permanent magnet. The permanent magnet is inside the hollow cylindrical anode (1) and is made of a cobalt/rare-earth compound. A flux guide (4, 5) is used to concentrate the magnetic field in the discharge space and consists of a first pole ring (4) mounted on the cathode-end of the permanent magnet and a second pole ring (5) mounted on the anode-end of the magnet (i.e. the end away from the cathode). The axial holes in both pole rings taper inwards in passing out away from the magnet. The discharge lamp is for qualitative and quantitative spectral analysis. The ions striking the sample being analysed (solid, liquid or gas) are only slightly affected by the magnetic field because of their large mass. Nevertheless the increase in ion energy is sufficient to increase sample degradation (solid in or on the disc (8)) and thereby allow the pressure to be reduced from 80001200 Pa to e.g. 130-530 Pa.</p> |
