[fdwrds]

Hey,

I am currently monitoring a photochemical reaction in real time using ATR-Spectroscopy and have a reaction that occured with two different mechanisms, it is first order at the start when there is plenty of water available and second order when the water becomes less readily available.

Can anyone tell me of any general differences between IR analysis in the solid phase and in the solution phase, i.e lack of mobilty of the sample.

Thanks

[ARGOS++]

Dear Francine;

For which part of the IR range (NNIR, NIR, Middle, or Far) are you ‘looking’?


Good Luck!
                    ARGOS⁺⁺

[fdwrds]

The sample is being irradiated with UV light of unknown wavelength, while its IR spectra is being recorded in the range 600cm-1 to 4000cm-1 at varying timescales depending on the reaction, we are currently studying the photolysis of silver nitrate solution, however the heat from the lamp leads to the evaporation of water present. Upon analysis of the kinetics it is found that there appears to be 2 phases to the reaction, the first phase has first order kinetics and the second phase exhibits second order kinetics, this has been justified by saying that the evaporation of water means that it is no longer in excess (i.e constant) and therefore the rate of the reaction becomes depended upon it and slows due to the poor ability of silver nitrate to undergo photochemistry in the solid phase. I was just wondering if u have any more ideas about the different between solid/liquid spectroscopy that i could comment on.