00:04
We'd like to solve each of these different problems.
00:07
So let's look at part a, question one.
00:12
Okay.
00:13
Let's first write down our electronic configuration of manganese 2 plus.
00:18
That is argon 3d to the 5th.
00:23
We have an electronic configuration, therefore, from that.
00:27
In crystal field theory, this manganese ion experiences an octahedral crystal field splitting.
00:35
But we have a half -filled d -shell configuration.
00:39
So we have no low -energy electronic transitions possible.
00:45
So any d -to -d transitions that occur would be weak transitions.
00:55
And so this is why we see weak absorption in this compound.
00:59
Now for our second part, would you expect broad weak bands or sharp weak bands? our transitions are laporte forgiven, forbidden.
01:12
So we expect weak absorption bands.
01:18
So we would expect them to be broad and weak because we have dd transitions in an octahedral field...