Abstract
Calcium diatomic molecules were produced in a heat-pipe oven at temperatures from 1000 to 1200 K. Photoluminescence of Ca2 has been studied with various laser sources and with white light. Discrete, sharp line spectra are attributed to known bound states of Ca2. A broad continuum emission with an oscillatory intensity distribution is associated with emission to the repulsive part of the lower state. A weak continuum emission to another repulsive state also has been observed. The observed strong emission from the atomic resonance lines at 422.7 and 657.3 nm probably is caused by dissociation of excited Ca2 molecules. The laser-excited photoluminescence experiments suggest that the ground state of Ca2 is repulsive and that the lowest observed bound state of Ca2 correlates with the 3P atomic state.
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