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Chemistry · Glossary

What is Tunnelling, transmission probability?

Also known as: tunnelling · transmission probability

Definition 1.30 University Chemistry — Year 3 · Chapter 1 — Quantum Mechanics for Chemists: Model Systems

Tunnelling is the passage of a particle through a region where its energy is lower than the potential energy, forbidden in classical mechanics. The transmission probability TT of a barrier is the fraction of incident particles found beyond it.

Transmission probability through a model barrier 0.40 eV high and 50 pm wide. At half the barrier height the proton passes about 58 times more often than the deuteron (log scale).
Transmission probability through a model barrier 0.40 eV high and 50 pm wide. At half the barrier height the proton passes about 58 times more often than the deuteron (log scale).
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