At page 190 of Bransden & Joachain (see the page from http://books.google.com/books?id=i5...nsden,+Charles+Jean+Joachain&hl=da#PPA190,M1"), there are 2 expressions for the transition probability, (4.38) and it's absolute value squared in (4.39). Is it just me or are the 2 term dimensionally different? Obviously everything from (4.38) is squared in (4.39) except the [itex] d\omega [/itex]. Hence they can't be the same dimensionally. How can this be right?