# Resonant frequency of Volatile organic compounds

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1. Jun 8, 2017

### Sveral

Hello ,
could someone tell me ,where to find Resonant frequency of the chemical bond of the following Volatile organic compounds:
Propene,Toluene,Benzene,Ethylbenzene.
Thanks in advance .

2. Jun 8, 2017

### hilbert2

You could try to find IR spectra of those compounds and see what bonds the spectral peaks are assigned to, in case you mean vibrational frequencies.

3. Jun 9, 2017

### Sveral

Yes, you put it more accurately, any idea as tom where one can find a chart with these frequencies? Also, is there a difference in the vibrational frequency of a volatile organic compound and a non-volatile one, for example, propene?

4. Jun 10, 2017

### HAYAO

Well, quick google in google images with the keywords "*compound name* IR spectrum" gave my IR spectrum for all of the compounds you mentioned.

5. Jun 11, 2017

### Sveral

Thank you ,will remember that .

6. Jun 11, 2017

### HAYAO

I'm sorry, I made a bad typo. It was supposed to be "gave me" not "gave my". Big difference that could've got you confused. Just so you know.

7. Jun 18, 2017

### Sveral

Didnt really notice that one, just read it as "me" anyways:D Could anyone explain to me, wheather or not resonance can be created by continuously applying a photon flux , which when reaches the total energy of the bond will break it?

8. Jun 18, 2017

### HAYAO

I have to clear up several things before I can answer your question. Some of what I say below, you might know, so you can just tell me whether you know or not.

1) Bond does not dissociate when a molecule absorbs energy corresponding to the bonding mode (resonance). You have just simply excited the molecule to a higher phonon level.

2) There is a difference between photon flux and photon energy. The former essentially refers to how many photons will be in a unit time and unit area (typically given in W/mm2). The latter refers to the energy a single photon itself has (units in wavelength, wavenumber, or eV...sometimes in frequency).

3) Continuous application of a photon beam only increases the number of molecule excited to a higher phonon level. Theoretically, it is possible to doubly excite a single molecule when using high intensity beams (like lasers), but the possibility of the phonon excited molecule deactivating is significantly higher than absorbing two photons.

With that said, can you rephrase your question? Or does this already answers it?

I am wondering. Are you talking about electronic excited state or vibration excited state? What we've talked about so far is the vibration excited state. But bond dissociation by absorption of a photon usually involves electronic excited state.

9. Jun 19, 2017

### Sveral

Ok, fair enough. I think, that the best option would be to simply quote the text I am talking about, but, please, do not ask for the entire document, that I simply can not do. the quote "
The desorption yield peaked at a wavelength
of 4.8 mm (Fig. 1B), corresponding to
0.26 eV, the energy of the vibrational stretch
mode of the Si-H bond at the terrace sites of the
Si(111) surface.
"

10. Jun 19, 2017

### HAYAO

You are referring to the article in Science:
http://science.sciencemag.org/content/312/5776/1024

This paper was retracted in 2011 because they were unable to reproduce the results. I'm not surprised because I have never heard of dissociation of bond by resonant infrared light. I am quite skeptical of this phenomenon. If it is possible, then it must be of an indirect process(es). I may be proven wrong in the future, but for now you'll have to provide me with a legitimate article.

11. Jun 20, 2017

### Sveral

True, but for now that is not yet possible, that, as far as I know, is the only work of its kind, that`s the problem...

12. Jun 20, 2017

### HAYAO

I'm sorry, but now your question doesn't make sense. What is "the problem" you are talking about? What are you trying to ask?