Dear Anatoly,
Strong Field Ionisation has been an active research field for well over five decades. Attosecond dynamics initiated by atomic ionisation in strong, optical to near-infrared laser fields.
Non-ionizing (or non-ionising) radiation refers to any type of electromagnetic radiation that does not carry enough energy per quantum (photon energy) to ionize atoms or molecules—that is, to completely remove an electron from an atom or molecule. Instead of producing charged ions when passing through matter, non-ionizing electromagnetic radiation has sufficient energy only for excitation, the movement of an electron to a higher energy state. In contrast, ionizing radiation has a higher frequency and shorter wavelength than nonionizing radiation, and can be a serious health hazard; exposure to it can cause burns, radiation sickness, cancer, and genetic damage. Using ionizing radiation requires elaborate radiological protection measures, which in general are not required with nonionizing radiation.
The region at which radiation becomes considered as "ionizing" is not well defined, since different molecules and atoms ionize at different energies. The usual definitions have suggested that radiation with particle or photon energies less than 10 electronvolts (eV) be considered non-ionizing. Another suggested threshold is 33 electronvolts, which is the energy needed to ionize water molecules. The light from the Sun that reaches the earth is largely composed of non-ionizing radiation, since the ionizing far-ultraviolet rays have been filtered out by the gases in the atmosphere, particularly oxygen.
The intensity of light, over a narrow frequency range, is reduced due to absorption by the material and re-emission in random directions. By contrast, a bright emission line is produced when photons from a hot material are detected in the presence of a broad spectrum from a cold source. The intensity of light, over a narrow frequency range, is increased due to emission by the material.
Atoms are ideally getting quantized, so they do not require extra ionization. Example, The motion of the electron in the hydrogen atom is not free. The electron is bound to the atom by the attractive force of the nucleus and consequently quantum mechanics predicts that the total energy of the electron is quantized.
References
IARC (31 May 2011). "IARC Classifies Radiofrequency Electromagnetic Fields As Possibly Carcinogenic To Humans" (PDF). Press Release (Press release).
Little MP, Rajaraman P, Curtis RE, Devesa SS, Inskip PD, Check DP, Linet MS (2012). "Mobile phone use and glioma risk: comparison of epidemiological study results with incidence trends in the United States". BMJ. 344: e1147. doi:10.1136/bmj.e1147. PMC 3297541. PMID 22403263.
It is obvious, the energy needed is larger than he minimum to separate the electron from the atom. If it is more, never mind.
It goes into kinetic energy.
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