  Long-range macrodimers formed by D-state cesium Rydberg atoms are studied in
experiments and in calculations. Cesium 62DJ-62DJ Rydberg-atom macrodimers,
bonded via long-range multipole interaction, are prepared by two-color
photo-association in a cesium atom trap. The first color (pulse A) resonantly
excites seed Rydberg atoms, while the second (pulse B, detuned by the molecular
binding energy) resonantly excites the Rydberg-atom macrodimer states below the
62DJ pair asymptotes. The Rydberg-atom molecules are measured by extraction of
auto-ionization products and Rydberg-atom electric-field ionization, and ion
detection. Molecular spectra are compared with calculations of adiabatic
molecular potentials. The lifetime of the molecules is obtained from
exponential fits to the dependence of the molecular signal on the detection
delay time; lifetimes of about 6 us are found.
