To calculate a current named for this phenomenon, John Bardeen used a time-dependent perturbation in his transfer Hamiltonian method. Fowler and Nordheim modeled field emission using this phenomenon, which causes Esaki (10[1])diodes to exhibit a negative differential resistance. (10[1])In a Nobel-Prize-winning device developed by Binning (10[1])and Rohrer, electrons undergo this phenomenon (10[1])to induce a current in a conducting microscope tip. In an alpha decay theory posited by George Gamow, (10[1])helium nuclei undergo this phenomenon to escape Coulombic (-5[1])interactions, (10[1])meaning there is a nonzero wavefunction outside of a finite square well. For 10 points, (10[1])name this quantum phenomenon where a particle passes through a classically forbidden (10[1])barrier. ■END■ (10[1])