Subject: how fast a molecule absorbs a photon

From: liaoyi >< u.washington.edu
Date: Mon, 4 Apr 2005 18:42:49 -0700 (PDT)

Hi, I have a very basic question for your opinion. When a molecule absorbs a photon, it will be excited to a excited state that has the same atomic geometry but different electron density distribution. I wonder how fast this process is? i.e. how fast the electron density distribution change from the ground state to excited state?

Yi