Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Ground state and stationary states

  1. Aug 4, 2015 #1
    Can you please explain the difference between ground state and stationary state? In the stationary state, are the electrons at rest inside the atom?
     
  2. jcsd
  3. Aug 4, 2015 #2

    vanhees71

    User Avatar
    Science Advisor
    2016 Award

    A stationary state is, by definition, a state, where nothing changes in time. In atomic physics it's the eigenstate of the Hamiltonian of the atom (usually sufficiently described as a "point like" positively charged nucleus and electrons, leading to an overall electrically neutral bound system), neglecting the coupling of the charges to the fluctuating electromagnetic field.

    The ground state is the state of lowest energy, and thus it is stable also when taking the coupling to the fluctuating radiation field into account. All the other stationary states, the excited states, are in fact instable when you take the coupling to the fluctuating radiation field into account and thus emit after some time (which cannot be predicted, because this is a random process according to quantum theory) a photon leaving the atom in a lower stationary state.
     
  4. Aug 4, 2015 #3

    jtbell

    User Avatar

    Staff: Mentor

    The ground state is a stationary state: the one with lowest energy. Stationary states with higher energy are excited states.
    In a stationary state, the position probability distribution of an electron does not change with time. Nor does the momentum probability distribution. QM does not address the question of what an electron is "really doing", "inside" the probability distribution, before something happens that "measures" the position or momentum.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Ground state and stationary states
  1. Stationary states (Replies: 10)

  2. Ground state (Replies: 20)

  3. Stationary state? (Replies: 5)

Loading...