He sounds like a real asshole.

What a bunch of bullshit.
Photo: Marvin (PA) via Flickr (CC)
You learn something new every day maybe
What is this "Wikibloogia"?

"We consider the system to begin in an eigenstate
of a given Hamiltonian H0. We consider the effect of a (possibly time-dependent) perturbing Hamiltonian H'. If H' is time-independent, the system goes only into those states in the continuum that have the same energy as the initial state. If H' is oscillating as a function of time with an angular frequency ω, the transition is into states with energies that differ by
from the energy of the initial state. In both cases, the one-to-many transition probability per unit of time from the state
to a set of final states
is given, to first order in the perturbation, by

where ρ is the density of final states (number of states per unit of energy) and
is the matrix element (in bra-ket notation) of the perturbation H' between the final and initial states."




