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, (10[1])which causes Esaki diodes to exhibit (10[1])a negative differential (10[1])resistance. In a Nobel-Prize-winning device developed by Binning and Rohrer, electrons undergo this phenomenon to induce a current in a conducting microscope tip. In an alpha decay theory posited by (10[1])George Gamow, helium nuclei undergo this phenomenon to escape Coulombic interactions, meaning there is a nonzero wavefunction outside of a finite square (10[1])well. For 10 points, name this quantum phenomenon where a particle passes through a classically forbidden (10[1])barrier. (10[1])■END■