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Thread: Ionization by resonance?

  1. #1 Ionization by resonance? 
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    Is it true that by finding specific resonant frequency we could split molecules
    or ionize atoms?One of such examples is certain infrared frequency which
    allows us to split up water molecules to OH- and H+ ions.
    If that`s true what is probability of dissociation in a small cloud of very hot
    water vapor if we will irradiate it with infrared laser of resonant frequency?
    How much % of water could dissociate in fraction of second and how much
    energy will it take?


    Antislavery
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  3. #2  
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    Quote Originally Posted by Stanley514 View Post
    Is it true that by finding specific resonant frequency we could split molecules
    or ionize atoms?One of such examples is certain infrared frequency which
    allows us to split up water molecules to OH- and H+ ions.
    If that`s true what is probability of dissociation in a small cloud of very hot
    water vapor if we will irradiate it with infrared laser of resonant frequency?
    How much % of water could dissociate in fraction of second and how much
    energy will it take?
    Laser radiation would have to be very energetic to dissociate a lot of water, producing hydrogen (an excellent fuel) and oxygen.

    Ludwik Kowalski (see Wikipedia)
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  4. #3  
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    What particulary about ``resonant frequency``?
    Is it pseudoscience?
    Antislavery
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    The ionization of molecules by the resonant absorption of electromagnetic radiation from tunable lasers has been accomplished in the area of mass spectrometry. However, the radiation was in the visible/UV region as it was used to excite electronic rather than vibrational transitions in the molecules (look up "resonant two photon ionization" or R2PI). It should be noted that this process is difficult to set up in a lab and it is also very inefficient in energy terms. It is difficult to set up because the target molecules have inhomogeneously broadened spectra (due to Doppler broadening in the gaseous state) whereas the line width of the laser radiation is narrow. This means that only a small fraction of the target molecules will resonate with the incident radiation. Usually, the target molecules are cooled to very low temperatures in order to narrow the line width and make the ionization process more efficient. Also, many types of high power laser are very inefficient in themselves - a large amount of electrical energy has to be put in to produce a much smaller amount of energy in the form of light. Power levels often quoted regarding pulsed lasers are misleading. A laser capable of producing peak power in the gigawattt region might produce pulses with an energy of only about 1 joule. The high power level arises from the short pulse duration rather than from high energy pulses.

    It would be much more efficient to use the electricity required to drive the laser to break up the water by electrolysis.
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