21. Both techniques involve bombarding the sample with electrons, and measuring the negative ions produced. 22. So it is ion channels which prevent negative ions passing through while allowing positive ions? 23. Also, in an acid battery, both positive and negative ions are traveling in opposite directions. 24. But in electrides, the electrons are the negative ions . 25. Ionic solids like salt are made of positive and negative ions which attract each other. 26. Therefore, the authors only took the recombination rates of the positive and negative ions into consideration. 27. The gas captures the conducting free electrons in the arc to form relatively immobile negative ions . 28. DART can also operate in the negative ion mode by which negatively charged species are formed. 29. Increasing the pressure will help stabilize the anions and extend the lifetimes of the negative ions . 30. In particular, the sensitivity became more than one order of magnitude higher in negative ion modes.
