The modern evolutionary synthesis, which marries Darwin's theory of natural selection ... nature is the gift of stability: the quantum-mechanical hydrogen atom is stable. If the hydrogen atom ...

making the atom collapse. Or the electrons could be knocked out of position if a charged particle passed by. Bohr turned to Planck's quantum theory to explain the stability of most atoms.

A team of physicists led by The City College of New York's Lia Krusin-Elbaum has developed a novel technique that uses ...

When quantum electrodynamics, the quantum field theory of electrons and photons, was being developed after World War II, one of the major challenges for theorists was calculating a value for the Lamb ...

In 1899 Max Planck became a professor at the University of Berlin, after nine years at the University of Munich and Kiel University, in Germany. In his research there, he turned to a thermodynamic ...

This course introduces the quantum mechanical concept of angular momentum operator ... express the orbital angular momentum eigenstates and use them to describe the hydrogen atom states. In this ...

Equivalent derivations of time-dependent pertubation theory; Fermi golden rule; the Born approximation for scattering from Fermi golden rule; survival probability of a state in a time-independent ...