| 21. | Mechanisms other than atom-photon interaction can produce spectral lines.
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| 22. | Such photons always have enough energy to qualify as ionizing radiation.
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| 23. | The spectrum of the scattered photons is termed the Raman spectrum.
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| 24. | Where h \ nu represents the photon absorbed by the ion.
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| 25. | This gives the number of photons from airglow, N a:
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| 26. | Position and time of arrival are recorded for each detected photon.
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| 27. | Searches have found no point sources of EeV neutrons or photons.
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| 28. | This is done by measuring photons emerging directly from the collision.
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| 29. | The existence of the directional charges is related to soft photons.
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| 30. | To achieve the maximum efficiency, all photons should be converted.
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