Suppose a gas mixture of F,Cl, Br ,I is irradiated with photons of frequency appropiate to ionize Cl . What ions will be present in the mixture ?

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If the frequency has enough energy to ionize Cl, the radiation can ionize Br and I also. This is because the ionization energy of Br and I would be lesser than Cl;

So Cl+,Br+,I+ ions will only be present in the mixture.

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