Delayed photodesorption of Na atoms from large, surface-bound Na clusters is investigated with a novel technique that includes pulsed plasmon excitation and continuous Doppler-free two-photon evanescent wave detection of desorbing atoms. The spatial confinement of the laser beams within the evanescent wave, the Doppler-free nature of the detection mode, and an accurate evaluation of the kinetic energy of the desorbing atoms in terms of a multiphonon time-of-flight distribution allows temporal information on the decay mechanisms within the cluster to be obtained.
© 1996 Optical Society of America
Original Manuscript: February 21, 1996
Published: August 1, 1996
R. Gerlach, J. R. Manson, and H.-G. Rubahn, "Near-field time-of-flight spectroscopy of sodium atoms desorbing from surface-bound clusters," Opt. Lett. 21, 1183-1185 (1996)