| Popis: |
Summary From spectrograms of positive columns in Ne + Hg, 90% Ne + 10% Ar, 90% Ne + 10% Ar + Hg, 90% Ne + 10% Kr + Hg (pressure 10 mm, diameter of the tube 1 ½ cm, current 25 mA, tube in water) it is concluded that at 19°C the positive ions are mainly Hg+, formed by direct electron collision, whereas at 0°C for the building of the ions excitation of the noble gas atoms is necessary. The difference in colour between Ne-Hg and Ne-Ar-Hg at 0°C is due to the excitation of the Ne in Ne-Hg; the intensity of the Hg line 5461 A being the same in both cases within 10%. The intensity variation of the line 5461 A as a function of the distance to the cathode, being roughly proportional to the partial pressure of the mercury in the tube, was determined for the case that all the liquid mercury was concentrated at the cathode side of the tube (influence of the kataphoresis). |
