Abstract
Laser vaporization of a rotating metal target within a pulsed supersonic nozzle has been used to produce ultracold beams of copper clusters. Photoionization with an argon fluoride excimer laser followed by time-of-flight mass spectrometric analysis showed the cold beam to contain clusters in the range from 1 through 13 copper atoms. The ionization potential (IP) of the small clusters was seen to alternate above and below the 6.4-eV laser photon energy depending upon whether the cluster contained an een (high IP) or odd (low IP) number of copper atoms. The absorption spectrum of Cu/sub 2/ was recorded in the 4480 to 4660-A region by using two-color resonant two-photon ionization. The Cu/sub 2/ cluster beam was found to have translational, rotational, and vibrational temperatures of < 5, < 10, and 50 to 100/sup 0/K, respectively. In addition to the known B /sup 1/..sigma../sup +//sub u/ reverse arrow X /sup 1/..sigma../sup +//sub g/ band system, a new system was found in the same spectral range. Parameters for the new system were T/sub e/ = 21,867 +- 4 cm/sup -1/, omega'/sub e/ = 226 +- 3 cm/sup -1/, omega/sub e/ chi'/sub e/ = 3 +- 2 cm/sup -1/. The lifetime of the Bmore » state was found to be 35 +- 10 ns for the vibrational levels nu' = 0 and 1, and it is argued this short lifetime is likely due to predissociation. The lifetime of the new C state was found to be 1.0 +- 0.2 ..mu..s. 4 figures, 1 table.« less
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