chief
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reactions that emit radiation
There are chemical reactions which mit electromagnetic radiation: Well known are chemical lasers, the emission of light in the H + Cl -reaction and
some others.
Now the question: Are there reactions known which emit in the microwave- or RF- region ? Sounds more than probable to me ... ...
Equipment needed: Some broadband spectral analyzer ...
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Globey
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hmmm...h**p://vv vv vv.metafilter.com/77322/A-Review-of-Criticality-Accidents ?
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Sauron
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Those are nuclear reactions, globey.
chief is wondering about chemical masers
Wrong sort of radiation.
He is talking radio frequency or microwave.
Sic gorgeamus a los subjectatus nunc.
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Sedit
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I dont know if its what your looking for chief but you could always excite ammonia and as it drops back down to ground state you will emit microwaves.
Knowledge is useless to useless people...
"I see a lot of patterns in our behavior as a nation that parallel a lot of other historical processes. The fall of Rome, the fall of Germany — the
fall of the ruling country, the people who think they can do whatever they want without anybody else's consent. I've seen this story
before."~Maynard James Keenan
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pantone159
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Quote: Originally posted by Sedit  | | you could always excite ammonia and as it drops back down to ground state you will emit microwaves. |
Yes, I think it is the lone pair flipping back and forth (with the pyramid inverting), which was used in the first maser.
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watson.fawkes
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| Quote: Originally posted by chief | | Now the question: Are there reactions known which emit in the microwave- or RF- region ? Sounds more than probable to me ... |
First, learn the relation E = hν between photon energy and frequency. (That's a Greek nu, not the letter v.) Then compare
that with various ionization and bond energies. In short: HF yes, microwave not so much.
Much more problematic for observation is the photon flux. It's proportional to reaction rates. If the reaction isn't quick, your photon flux will be
lost in background noise.
So you want high energy bonds breaking and doing so quickly. Please see Energetic Materials.
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not_important
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Furthering that, chemical reactions can be considered to be on the order of 1 to 10 eV, the energy of a 2.45 GHz (microwave oven) photon has energy en
close 0.0016 eV ; roughly 3 orders of magnitude less.
IR is in the range emitted by warm to hot objects, so any reaction that generated enough heat to raise the reaction mass to 100 C or better is
emitting IR; obviously that's black body and not particular wavelengths.
Because these wavelengths have energies equal to or less than that of thermal oscillations, you'll need resonance structures to select some particular
wavelength, as already said you're basically looking at chemical reaction pumped masers.
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JohnWW
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In the case of visible light emission by chemical reactions, Chief means chemiluminescence, or in the case of biochemical reactions in living
organisms, biochemiluminescence. (See Google.com or Wikipedia.com). The latter are mostly reactions between luciferin and the enzyme luciferase in
the bodies of nocturnal insects such as fireflies (to attract a mate) and cave glow-worms (to attract prey), and in patches on the skins of certain
deep-sea fishes living in almost complete darkness for the same purposes.
Emission of radiation in reactions in the RF or microwave regions entails the emission of photons of much lower energy. Chemical masers emit
microwaves, but involve small changes in energy levels of a substance rather than actual reactions. Of course, all exothermic reactions emit radiation
in the form of heat at wavelengths in the infra-red, shorter than microwave wavelengths but longer than visible light.
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merrlin
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"Chemical Generation and Reception of Radio- and Microwaves" by Buchachenko and Frankevich is the best text that I have seen on the subject. Although
the photon energies are negligible compared to bond energies, RF and Microwave pumping of radical pairs can modify their spin behavior and the
reaction paths that are available. I stumbled upon this forum for the first time tonight, and my primary interest for the past couple of years has
been dynamic spin chemistry, with a particular focus on the microwave induced magnetic isotope effect (MIMIE). Is there anybody here who is familiar
with the work of Anatoly Buchachenko?
Attachment: Magnetic Isotope Effect-Nuclear Spin Control of Chemical Reactions.pdf (206kB)
This file has been downloaded 1304 times
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watson.fawkes
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This is great stuff. Thanks for
posting.
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Globey
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Aah my bad...I see. Cool, you could disrupt cell phones with a microwave "dhorty b0mba" 
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merrlin
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Thanks for the interest. Attached are two more articles. The article by Timmel and Henbest is one of the better discussions of the mechanisms involved
in spin evolution. The article by Salikhov and Malin addresses the fundamental mechanisms of spin modification by microwaves. I have noticed that
there are a number of people here who have expertise in electrochemistry. My research project is an investigation of spin locking of electrolytic
reactions. I have largely finished the system design and I would like to get some opinions on what transition metal complexes would be best suited for
study. I will be starting a new topic "spin locking of electrolytic reactions."
Attachment: Some Peculiarities of Spin Dynamics of Geminate Radical Pairs under Microwave Pumping_.pdf (758kB)
This file has been downloaded 713 times
Attachment: A study of spin chemistry.pdf (406kB)
This file has been downloaded 670 times
[Edited on 5-4-2009 by merrlin]
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Texium
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