Electric lamp and discharge devices – Electrode and shield structures – Cathodes containing and/or coated with electron emissive...
Patent
1978-06-27
1981-02-24
Chatmon, Jr., Saxfield
Electric lamp and discharge devices
Electrode and shield structures
Cathodes containing and/or coated with electron emissive...
313161, 313209, 313311, 356313, 356314, H01J 114
Patent
active
042530385
ABSTRACT:
A light source is disclosed which can be used in atomic absorption analysis using the Zeeman effect. In operation, an external magnetic field is applied to the hollow cathode of the light source to cause the Zeeman-splitting of an emission line from the cathode material. The hollow cathode is made of a ferromagnetic metal as which is the element of interest for analysis and a metal for reducing the magnetic shield of the externally applied magnetic field by the ferromagnetic metal so that the external magnetic field effectively acts on the hollow portion of the cathode to provide the desired Zeeman-splitting. The hollow cathode is designed such that the product of the saturation flux densities of the cathode materials and the volume thereof is equal to or smaller than 0.2(Wb.multidot.m).times.10.sup.-6. The emission line from the cathode material is produced by excitation from a high frequency power supply, the power supply being connected to the cathode and the anode of the light source.
REFERENCES:
patent: 3725716 (1973-04-01), Yamasaki
patent: 3732454 (1973-05-01), Okagaki et al.
patent: 4100446 (1978-07-01), Harada
Hosoya Akira
Kuniya Keiichi
Maeda Kunihiro
Ohishi Kohnosuke
Tomita Sadami
Chatmon, Jr. Saxfield
Hitachi , Ltd.
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