{"product_id":"electron-tube-helium-ionization-potentials-s","title":"Electron Tube (Helium): Ionization Potentials S","description":"Experiment Topics: ..\u003cbr\u003eThe following topics can be discussed with this highly evacuated tube: \u003cbr\u003e•  Quantitative analysis of inelastic collisions between electrons and Helium atoms \u003cbr\u003e•  Determination of the ionization energy \u003cbr\u003e•  Resolution of the energy states of various primary and orbital angular-momentum quantum numbers\u003cbr\u003e\u003cbr\u003eProduct Information: ..\u003cbr\u003eThe critical potential tube features an electron gun with a directly heated tungsten cathode and a cylindrical anode in a glass bulb, evacuated and then filled with Helium. The inner wall of the bulb is covered with a conductive coating connected to the anode. The collector ring is situated inside the bulb in such a way that diverging electron beams cannot directly collide with it.\u003cbr\u003eIf the collector voltage is positive, then those electrons which have lost almost all their kinetic energy due to an inelastic collision with a Helium atom will be deflected towards the collector where they accumulate. The maxima of the resulting curve for the electron current (collector current against anode current) will correspond to the excitation energies of the Helium atoms.\u003cbr\u003eIf the collector voltage is negative, the positively charged Helium ions will be deflected towards the collector and accumlate there. The ionization energies of Helium atoms can be read from the plot of the resulting ion current curve (collector current against anode current).\u003cbr\u003e\u003cbr\u003eSpecifications: ..\u003cbr\u003eGas filling:\tHelium\t \u003cbr\u003eFilament voltage UF :\tmax. 7 V AC\/DC\t \u003cbr\u003eAnode voltage UA :\tmax. 80 V; \ttyp.: = 18 … 26 V\u003cbr\u003eAnode current IA :\tmax. 1 mA; \ttyp.: 0.2 … 1.5 µA\u003cbr\u003eGrid voltage UG :\tmax. 6V; \ttyp.: 0.1 … 3.0 V\u003cbr\u003eGrid current IG :\tmax. 200 µA; \ttyp.: 0.2 … 5.0 µA\u003cbr\u003eCollector voltage UC :\tmax. ± 5 V;\ttyp.: ± 0.5 … ± 2.5 V\u003cbr\u003eCollector current IC :\t≤ 400 nA\t \u003cbr\u003eGlass bulb:\t130 mm Ø approx. \u003cbr\u003eLength of tube:\t260 mm approx.","brand":"3B Scientific Teltron","offers":[{"title":"Default Title","offer_id":49419165270293,"sku":"3BS1022131","price":3190.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0857\/4897\/3845\/files\/1022131_01_1200_1200_Electron-Tube-Helium-Ionization-Potentials-S.jpg?v=1761031715","url":"https:\/\/unitedsupplycorp.com\/products\/electron-tube-helium-ionization-potentials-s","provider":"United Supply Corp.","version":"1.0","type":"link"}