| 11. | Plasma bubbles form after dark when the sun stops ionising the ionosphere.
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| 12. | Interatomic Coulombic decay can occur when one atom is ionised and excited.
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| 13. | He showed free electrons to be the ionising agents.
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| 14. | Instead very dim streamers of ionised gas are formed.
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| 15. | They use the ionising effect of radiation upon a gas-filled sensor.
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| 16. | As helium is heated it becomes more ionised, which is more opaque.
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| 17. | The ring nebula NGC 2359 is excited by the ionising radiation of WR7.
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| 18. | It also contains both singly and doubly ionised helium.
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| 19. | 9 Sgr itself is surrounded by an ionised NGC 6523 and NGC 6533.
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| 20. | The doped droplets are ionised with high speed electrons.
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