A general relation between the group delay and the dwell time is derived for quantum tunneling. It is shown that the group delay is equal to the dwell time plus a self-interference delay. The Hartman effect in quantum tunneling is explained on the basis of saturation of the integrated probability density (or number of particles) under the barrier.

After the identification of 5-10% of trans-unsaturated acids, mainly elaidic (trans-octadec-9-enoic) and vaccenic (trans-octadec-11-enoic), in ox fat (Swern, Knight & Eddy, 1952), it has been shown in this Laboratory (Hartman, Shorland & McDonald, 1954, 1955) that substantial amounts of these acids appear in the depot fats of other ruminants (3-5-11-2 %) and in certain marsupials (18-1-21-0 %),...

: We analyze different examples to show that the so-called generalized Hartman effect is an erroneous presumption. The results obtained for electron tunneling and transmission of electromagnetic waves through superlattices and Bragg gratings show clearly the resonant character of the phase time behavior so that a generalized Hartman effect is not expected to occur. A reinterpretation of the exp...