Photoionization what will happen to compounds?

[d.sonali20]

photoionization...what will happen to compounds??

1) when UV light falls on molecules such as SiO or Fe2O3,will photo electric effect take place or will the they ionize into ions or both?? does this depend on any factor like maybe the wavelength of light being used??

2)how will positive ions be affected by the UV light??will they give photo electrons too??

i tried to google this several times and in several ways but found nothing...please help...

 

[mathman]

Photography the old fashioned way - film.

 

[d.sonali20]

@mathman
? sorry dint get u...

 

[d.sonali20]

photo electric effect of positive ions

under photo electric effect,what will happen to positive ions??
will they also give out photo electrons??
if yes,what is its probability??

 

[d.sonali20]

no one knows the answer for this??please help...its urgent!

 

[LostConjugate]

It is not an experiment performed on isolated atoms. The electrons are ejected when radiation is directed at a conductive surface. As long as the frequency is high enough though it can eject electrons from a stronger binding potential.

 

[uby]

the wavelength limit for the photoelectric effect is related to the work function of the material. thus, the answer to your question lies in the work function of a compound.

defining the work function of a compound semiconductor can be non-trivial.

 

[mathman]

@mathman
? sorry dint get u...

When light hits photographic film, the chemicals undergo a change, so that after further processing an image can be produced. I do not know the details of the particular reactions.

 

[JeffKoch]

no one knows the answer for this??please help...its urgent!

Homework due today?

 

[d.sonali20]

It is not an experiment performed on isolated atoms. The electrons are ejected when radiation is directed at a conductive surface. As long as the frequency is high enough though it can eject electrons from a stronger binding potential.

what if i am flashing UV light onto a gas containing +ve ions and detecting the photo electrons??if the logic is just that as long as the frequency is high enough electrons will be ejected,do you know how i can find out the binding potential(work function) of some positive ions like fe(iii) and si(ii)...i've been trying to get this info for a while but I'm not able to...

 

[LostConjugate]

what if i am flashing UV light onto a gas containing +ve ions and detecting the photo electrons??if the logic is just that as long as the frequency is high enough electrons will be ejected,do you know how i can find out the binding potential(work function) of some positive ions like fe(iii) and si(ii)...i've been trying to get this info for a while but I'm not able to...

Yea, it really comes down to the binding energy of the orbital.

There is a chart here for Si

http://en.wikipedia.org/wiki/Electron_binding_energy

 

[d.sonali20]

the wavelength limit for the photoelectric effect is related to the work function of the material. thus, the answer to your question lies in the work function of a compound.

defining the work function of a compound semiconductor can be non-trivial.

okay...what about positive ions??

 

[d.sonali20]

Homework due today?

actually I'm studying the working of a detector that detects meteor smoke particles...i've got to build it by mid november and I'm still stuck in its working

 

[d.sonali20]

Yea, it really comes down to the binding energy of the orbital.

There is a chart here for Si

http://en.wikipedia.org/wiki/Electron_binding_energy

oh!i didnt think ionization potential and work function would be the same...but i guess they would have to be...since both represent the energy required to remove an electron...
thanks for the help