zamân-e gozar (#)
Fr.: temps de traversée
A concept used for checking the stability of a group of mass such as a → cluster of galaxies or a → star cluster. The crossing time is given by tc = R/V, where R is the average projected radial distance of group members from the center of mass and V the Gaussian dispersion in internal velocity.
Fr.: conversion intersystème
A → radiationless relaxation process in which a molecule in some excited → electronic state converts to a state of different spin → multiplicity. Intersystem crossing is analogous to → internal conversion.